High Iowait : Write Access Request
Nov 22, 2008
diagnosing my server which currently experiencing high iowait for weeks, I'm still figuring the root cause.
total used free shared buffers cached
Mem: 4051 3653 398 0 341 2847
-/+ buffers/cache: 464 3587
Swap: 8191 0 8191
The server spec as follow :
HP DL 380 G5
4G RAM
2.6.18-53.el5PAE
the load is around 1 or 2 , but iowait have been on the high side even the server currently is under utilized
I'm running LVM and hardware RAID 1 on the server.
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Jul 2, 2008
I am running in a High load problem lately. I have one of those cheap 1and1 servers which was running fine until 2 weeks ago. Once I rebooted accidentaly, it did not come back with some unrepairable kernel errors and I had to re-image it.
I chose to reimage the server with CentOS 5, for better support. The new re-image worked fine for some days, at least so I thought and now I am having high loads. The server crashes if not monitored every moment as the load is unpredictable.
Just a restart of the Apache will bring the server back to normality, but I am not sure if it is apache or some other script to be blamed.
I have beeing monitoring through apache server-status, but I cannot organize something unusual in the high load moments.
At this moment for example:
top - 09:00:36 up 15:43, 3 users, load average: 3.57, 4.60, 5.32
Tasks: 144 total, 2 running, 142 sleeping, 0 stopped, 0 zombie
Cpu(s): 10.6%us, 6.5%sy, 0.0%ni, 18.7%id, 63.5%wa, 0.2%hi, 0.5%si, 0.0%st
12:00:29 AM CPU %user %nice %system %iowait %steal %idle
12:10:01 AM all 9.14 0.00 5.52 44.66 0.00 40.68
12:20:14 AM all 6.83 0.00 3.98 27.88 0.00 61.32
12:30:10 AM all 6.44 0.00 4.20 81.25 0.00 8.11
12:40:09 AM all 5.25 0.00 4.09 81.93 0.00 8.73
12:50:15 AM all 5.11 0.00 3.79 90.74 0.00 0.36
01:00:07 AM all 7.22 0.00 4.52 57.11 0.00 31.15
01:10:13 AM all 6.89 0.00 4.01 55.38 0.00 33.71
01:20:14 AM all 4.37 0.00 3.27 41.88 0.00 50.48
01:30:25 AM all 4.26 0.00 3.29 63.42 0.00 29.03
01:40:06 AM all 27.18 0.00 4.75 58.27 0.00 9.80
01:50:03 AM all 29.64 0.00 6.61 51.50 0.00 12.25
02:00:07 AM all 27.00 0.00 8.48 55.49 0.00 9.03
02:10:10 AM all 19.29 0.00 4.97 73.80 0.00 1.94
02:20:04 AM all 37.85 0.00 6.78 40.70 0.00 14.67
02:30:05 AM all 15.65 0.00 4.80 68.47 0.00 11.08
02:40:08 AM all 9.06 0.00 5.60 37.49 0.00 47.86
02:50:07 AM all 5.36 0.00 3.62 42.29 0.00 48.73
03:00:02 AM all 6.05 0.00 4.08 47.27 0.00 42.60
03:10:02 AM all 4.22 0.00 3.68 38.17 0.00 53.93
03:20:02 AM all 4.06 0.00 3.75 41.37 0.00 50.82
03:30:22 AM all 4.42 0.00 3.93 45.25 0.00 46.41
03:40:11 AM all 4.34 0.00 3.95 39.58 0.00 52.13
03:50:02 AM all 4.67 0.00 4.01 32.53 0.00 58.80
04:00:08 AM all 3.72 0.00 3.87 28.40 0.00 64.02
04:10:02 AM all 13.49 0.00 6.58 20.82 0.00 59.10
04:20:01 AM all 6.70 0.00 4.63 6.06 0.00 82.61
04:30:02 AM all 1.44 0.00 1.21 4.75 0.00 92.59
04:40:01 AM all 12.42 0.00 8.12 7.65 0.00 71.81
04:50:02 AM all 1.43 0.00 1.07 4.02 0.00 93.47
05:00:02 AM all 1.60 0.00 1.40 8.62 0.00 88.38
05:10:10 AM all 3.80 0.00 3.02 17.86 0.00 75.32
05:20:06 AM all 5.10 0.00 4.22 23.34 0.00 67.34
05:30:02 AM all 1.54 0.00 1.40 11.22 0.00 85.85
05:40:05 AM all 1.75 0.00 1.89 13.12 0.00 83.23
05:50:12 AM all 2.15 0.00 2.22 18.92 0.00 76.72
06:00:02 AM all 1.92 0.00 2.01 12.87 0.00 83.20
06:10:02 AM all 2.27 0.00 2.16 11.53 0.00 84.04
06:20:03 AM all 3.56 0.00 3.02 25.26 0.00 68.16
06:30:10 AM all 2.66 0.00 2.05 18.13 0.00 77.16
06:40:02 AM all 2.58 0.00 2.25 22.87 0.00 72.30
06:50:02 AM all 2.68 0.00 1.92 15.77 0.00 79.63
07:00:03 AM all 3.06 0.00 2.48 26.01 0.00 68.46
07:10:03 AM all 3.65 0.00 3.20 36.54 0.00 56.61
07:10:03 AM CPU %user %nice %system %iowait %steal %idle
07:20:03 AM all 4.40 0.00 3.28 43.86 0.00 48.46
07:30:02 AM all 4.10 0.00 3.17 31.30 0.00 61.43
07:40:06 AM all 7.67 0.00 3.95 50.79 0.00 37.59
07:50:02 AM all 4.72 0.00 3.11 44.30 0.00 47.86
08:00:03 AM all 5.57 0.00 3.72 47.15 0.00 43.56
08:10:07 AM all 10.66 0.00 3.59 71.62 0.00 14.13
08:20:17 AM all 5.67 0.00 3.42 58.81 0.00 32.10
08:30:10 AM all 11.12 0.00 3.49 76.71 0.00 8.67
08:40:03 AM all 7.00 0.00 3.36 47.94 0.00 41.71
Average: all 7.53 0.00 3.76 38.90 0.00 49.81
Some configurations:
The reimage partittioning looks like this:
/dev/sda1 950M 138M 765M 16% /
/dev/sda5 4.7G 1.9G 2.9G 40% /usr
/dev/sda7 63G 58G 5.0G 93% /var
/dev/sda6 4.7G 23M 4.7G 1% /home
none 1.0G 500K 1.0G 1% /tmp
KeepAlive On
MaxKeepAliveRequests 300
KeepAliveTimeout 15
<IfModule prefork.c>
StartServers 10
MinSpareServers 20
MaxSpareServers 50
ServerLimit 256
MaxClients 180
MaxRequestsPerChild 2000
</IfModule>
<IfModule worker.c>
StartServers 2
MaxClients 150
MinSpareThreads 25
MaxSpareThreads 75
ThreadsPerChild 25
MaxRequestsPerChild 0
</IfModule>
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
skip-locking
query_cache_limit=1M
query_cache_size=32M
query_cache_type=1
max_connections=250
interactive_timeout=100
wait_timeout=20
connect_timeout=10
thread_cache_size=80
key_buffer=64M
join_buffer=1M
max_allowed_packet=16M
table_cache=512
record_buffer=1M
sort_buffer_size=1M
read_buffer_size=1M
max_connect_errors=10
thread_concurrency=2
read_rnd_buffer_size=1M
myisam_sort_buffer_size=64M
server-id=1
processor : 1
vendor_id : GenuineIntel
cpu family : 15
model : 3
model name : Intel(R) Pentium(R) 4 CPU 2.80GHz
stepping : 4
cpu MHz : 2793.324
cache size : 1024 KB
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Oct 27, 2008
Recently I've noticed named causing high iowait.
If I stop named, iowait reduces to around 40%.
Code:
10:05:55 up 1:59, 2 users, load average: 5.09, 6.73, 6.23
192 processes: 185 sleeping, 7 running, 0 zombie, 0 stopped
CPU states: cpu user nice system irq softirq iowait idle
total 4.3% 0.0% 5.0% 0.3% 0.0% 89.2% 0.9%
cpu00 4.8% 0.0% 4.8% 0.0% 0.1% 89.3% 0.8%
cpu01 3.9% 0.0% 5.2% 0.7% 0.0% 89.0% 1.0%
Mem: 1023624k av, 966688k used, 56936k free, 0k shrd, 119500k buff
658244k actv, 130464k in_d, 16084k in_c
Swap: 1052248k av, 72096k used, 980152k free 496268k cached
PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME CPU COMMAND
15 root 15 0 0 0 0 SW 0.8 0.0 2:23 1 kjournald
9182 named 15 0 3504 3504 2184 S 0.6 0.3 0:01 0 named
8301 apache 15 0 14564 11M 6832 S 0.5 1.1 0:00 0 httpd
1043 qmails 24 0 1196 1064 384 R 0.4 0.1 1:10 0 qmail-send
1047 qmailr 25 0 372 364 280 S 0.3 0.0 0:35 1 qmail-rspawn
30825 root 15 0 1140 1088 744 R 0.2 0.1 0:09 1 top
7025 apache 15 0 13536 10M 6820 S 0.2 1.0 0:00 0 httpd
7076 apache 15 0 13868 11M 6820 S 0.2 1.1 0:00 1 httpd
759 root 15 0 568 548 488 R 0.1 0.0 1:30 1 syslogd
I believe this isn't normal.
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Jul 14, 2009
In my server iowait is causing high load, how do we find out which are all users taking memory that could cause my server to use swap memory.
server : linux centos/Cpanel
I have tried the below commands, but how do we locate user specific,
ps aux --sort -vsz | head -25
vmstat 1
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Apr 12, 2008
Server is Xeon 3060, 3GB Ram, 250GB SATA-II HDD. I followed the recommendations made by mysqlprimer tuner script.
top - 11:54:33 up 237 days, 15:01, 1 user, load average: 6.06, 2.80, 1.65
Tasks: 133 total, 2 running, 131 sleeping, 0 stopped, 0 zombie
Cpu(s): 13.0% us, 4.9% sy, 0.0% ni, 24.3% id, 57.8% wa, 0.0% hi, 0.0% si
Mem: 3114144k total, 3096468k used, 17676k free, 30220k buffers
Swap: 2096440k total, 32348k used, 2064092k free, 2515412k cached
PID USER PR NI %CPU TIME+ %MEM VIRT RES SHR S COMMAND
8610 nobody 16 0 28 1:37.73 0.7 78908 20m 16m S lsphp4
10520 nobody 16 0 3 0:01.97 0.4 78788 10m 6884 S lsphp4
26474 nobody 15 0 2 15:04.07 0.4 14196 11m 3216 S lshttpd
28275 mysql 22 6 1 131:28.83 7.4 733m 224m 2700 S /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pi
Code:
[mysqld]
max_connections=500
max_user_connections=300
skip-locking
skip-innodb
query_cache_limit=1M
query_cache_size=64M
query_cache_type=1
interactive_timeout=60
wait_timeout=60
connect_timeout=6
thread_cache_size=128
key_buffer_size=640M
max_allowed_packet=16M
table_cache=2048
join_buffer=1M
sort_buffer=2M
record_buffer=1M
sort_buffer_size=2M
read_buffer_size=2M
safe-show-database
max_connect_errors=10
thread_concurrency=2
myisam_sort_buffer_size=64M
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
#log_slow_queries=/var/log/mysql/mysql_slow-queries.log
long_query_time=3
tmp_table_size=32M
max_heap_table_size=32M
#log-queries-not-using-indexes=/var/log/mysql/mysql_queries_no-indexes.log
join_buffer_size=2M
low_priority_updates=1
read_rnd_buffer_size=2M
[mysql.server]
user=mysql
basedir=/var/lib
[safe_mysqld]
err-log=/var/log/mysqld.log
var/lib/mysql/mysql.pid
open_files_limit=8192
[mysqldump]
quick
max_allowed_packet=16M
[mysql]
no-auto-rehash
[isamchk]
key_buffer=32M
sort_buffer=32M
read_buffer=16M
write_buffer=16M
[myisamchk]
key_buffer=32M
sort_buffer=32M
read_buffer=16M
write_buffer=16M
[mysqlhotcopy]
interactive-timeout
Whenever there are a lot of members online on my forum, the iowait shoot up, >30% and often times hovering at 60%. It'll eventually drop down to normal levels. However, during the high iowait, there are over 2.5GB of free memory according to the command, free -m
is it due to mysql not optimized or other processes? I don't think the bottleneck is on the cpu or ram.
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May 22, 2008
Followed the guide over at [url]to get proftpd setup.
It only lists ways to create a single upload directory and a single download directory.
Tried all possible ways to get a directory creating allowing read/write but so far unsuccessful.
how this can be acheived?
Here is my current config.
#start of config
<Directory /home/FTP-shared>
Umask 022 022
AllowOverwrite off
<Limit MKD STOR DELE XMKD RNRF RNTO RMD XRMD>
DenyAll
</Limit>
</Directory>
<Directory /home/FTP-shared/download/*>
Umask 022 022
AllowOverwrite off
<Limit MKD STOR DELE XMKD RNEF RNTO RMD XRMD>
DenyAll
</Limit>
</Directory>
<Directory> /home/FTP-shared/upload/>
Umask 022 022
AllowOverwrite on
<Limit READ RMD DELE>
DenyAll
</Limit>
<Limit STOR CWD MKD>
AllowAll
</Limit>
</Directory>
#end of config
/home/FTP-shared/read-write is the folder I want to be able to read and write data to.
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Mar 25, 2009
We are considering a new dedicated server host for a set of 25 domains, about 5 of which are very high traffic (80 million clicks a day each).
I am told that the biggest speed boost and performance comes from memory and fast hard disk. So I'm looking for at least a 16GB RAM and SCSI 10k 300GB hard disks.
I am also told that PHP etc is okay, but MySQL is the one that hogs resources after a while. So for the database server I need a high end server.
I like WHM/Cpanel so that should be alright.
A lot of email alerts may be sent through our system (about 500,000 a day on a good day as there's user subscription to updates functionality) so we may need a separate mail server?
My question: is the following config of 4 x quadcore Dunnington Intels be good enough for the above site? Can I run a database on this config for my kind of traffic or do I need a separate server too?
Code:
Quad Processor Hex Core Intel 7450 - 2.40GHz (Dunnington) - 6 x 9MB (L2) 12MB (L3) cache
Second Processor
Hex Core Intel 7450 - 2.40GHz (Dunnington) - 6 x 9MB (L2) 12MB (L3)
Third Processor
Hex Core Intel 7450 - 2.40GHz (Dunnington) - 6 x 9MB (L2) 12MB (L3) cache
Fourth Processor
Hex Core Intel 7450 - 2.40GHz (Dunnington) - 6 x 9MB (L2) 12MB (L3) cache
16 GB FB-DIMM Registered 533/667
1000 Mbps public uplink
1000 Mbps private uplink
Disk Controller RAID 10
HD1: 300GB SA-SCSI 10K RPM
HD2: 300GB SA-SCSI 10K RPM
HD3: 300GB SA-SCSI 10K RPM
HD4: 300GB SA-SCSI 10K RPM
CentOS 5 (32 bit)
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Mar 3, 2007
We just upgraded to VBulletin 3.6.5, and are experiencing strange behavior. My forums are on a dedicated server, 27,000 users.
We'll be running along fine with loads of .5-2.00, etc. Then suddenly, the loads start climbing to 50, 70, 85+. We've been trying to figure out why. We even went on a different (much more robust) server, still the same result. This only started happening after the upgrade. Restarting the server corrects the problem, but only until it happens again. It can happen at anytime - during peak or off peak. The server may run for an hour or two until this happens, or it can happen 10 minutes after a restart.
Late last night when loads were normal we benched the server hard, and it ran just fine. We just can't figure out where this load spike is coming from.
Server info below:
Servers:
Mysql: server version: 5.0.27-log
PHP: PHP 5.1.6 (cli) Zend Engine v2.1.0,
Apache Server version: Apache/2.2.3
Kernel: 2.6.19-1.2911.fc6 #1 SMP
Server:
Pentium III with 1 gig of ram
15k RPM SCSI Raid 5
1 Gig RAM
-----------------------------------------------------------------------
[root@forums forums]# cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 8
model name : Pentium III (Coppermine)
stepping : 6
cpu MHz : 861.001
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca
cmov pat pse36 mmx fxsr sse
bogomips : 1722.41
processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 8
model name : Pentium III (Coppermine)
stepping : 6
cpu MHz : 861.001
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca
cmov pat pse36 mmx fxsr sse
bogomips : 1721.51
--------------------------------------------------------------------------
my.cnf:
[root@forums forums]# cat /etc/my.cnf
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
log_error = /var/log/mysql_error.log
log-slow-queries = /var/log/mysql_slow_queries.log
safe-show-database
old_passwords
back_log = 20
skip-innodb
key_buffer_size = 256M
myisam_sort_buffer_size = 64M
join_buffer_size = 1M
read_buffer_size = 1M
sort_buffer_size = 2M
table_cache = 600
thread_cache_size = 384
wait_timeout = 35
connect_timeout = 10
tmp_table_size = 64M
max_heap_table_size = 64M
max_allowed_packet = 64M
max_connect_errors = 10
read_rnd_buffer_size = 524288
bulk_insert_buffer_size = 8M
query_cache_limit = 4M
query_cache_size = 48M
query_cache_type = 1
query_prealloc_size = 163840
query_alloc_block_size = 32768
default-storage-engine = MyISAM
[mysql.server]
user=mysql
basedir=/var/lib
[mysqld_safe]
err-log=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
open_files_limit = 8192
[mysqldump]
quick
max_allowed_packet = 16M
[myisamchk]
key_buffer = 64M
sort_buffer = 64M
read_buffer = 16M
write_buffer = 16M
-------------------------------------------------------
Relevant Apache:
StartServers 10
MinSpareServers 10
MaxSpareServers 15
ServerLimit 256
MaxClients 90
MaxRequestsPerChild 1000
---------------------------------------------------------
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Jul 2, 2007
cpu speed/type single or dual cpus): Intel Xeon 2x3.6
how much memory installed: 2048MB
hard drive type/configuration: 2x160GB SATA
linux distributor or windows version: CentOS 4.5 x86_64
apache/IIS version: apache 1.3.37
PHP version: php 4.4.7
MySQL version: 4.1.22-standard
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
19017 teknoloj 16 0 0 0 0 Z 27 0.0 0:00.93 php <defunct>
17751 mysql 15 0 241m 55m 3148 S 25 2.8 0:53.73 mysqld
19025 root 18 0 16204 6104 1392 D 6 0.3 0:00.17 cpcpan_check_in
18968 sohbetgo 16 0 44596 7540 3556 S 5 0.4 0:00.44 php
18552 nobody 15 0 32636 4208 1204 S 2 0.2 0:00.28 httpd
18808 resimsit 17 0 46944 9960 3616 R 1 0.5 0:00.23 php
18896 resimsit 16 0 46944 9984 3616 D 1 0.5 0:00.08 php
18921 resimsit 17 0 46404 9444 3572 R 1 0.5 0:00.09 php
18819 nobody 17 0 32644 4176 1192 S 1 0.2 0:00.06 httpd
18868 haylazt 16 0 0 0 0 Z 1 0.0 0:00.48 php <defunct>
18871 nobody 15 0 32504 4056 1148 S 1 0.2 0:00.06 httpd
18892 root 16 0 6416 1180 756 R 1 0.1 0:00.24 top
18978 nobody 16 0 32504 4028 1132 S 1 0.2 0:00.02 httpd
11 root 5 -10 0 0 0 S 0 0.0 0:24.56 events/1
2638 root 0 -20 0 0 0 S 0 0.0 0:16.96 loop0
2981 named 18 0 88016 2328 1152 S 0 0.1 8:44.12 named
3592 mailman 16 0 50316 2320 1828 S 0 0.1 0:00.78 python2.4
my.cnf
[mysqld]
safe-show-database
skip-innodb
max_connections = 500
key_buffer = 80M
myisam_sort_buffer_size = 64M
join_buffer_size = 1M
read_buffer_size = 1M
sort_buffer_size = 2M
table_cache = 1800
thread_cache_size = 384
wait_timeout = 25
connect_timeout = 10
tmp_table_size = 128M
max_heap_table_size = 128M
max_allowed_packet = 64M
max_connect_errors = 10
read_rnd_buffer_size = 524288
bulk_insert_buffer_size = 8M
query_cache_limit = 4M
query_cache_size = 96M
query_cache_type = 1
query_prealloc_size = 16384
query_alloc_block_size = 32768
ft_min_word_len=3
ft_max_word_len=25
[mysqld_safe]
open_files_limit = 8192
[mysqldump]
quick
max_allowed_packet = 16M
[myisamchk]
key_buffer = 64M
sort_buffer = 64M
read_buffer = 16M
write_buffer = 16M
ft_min_word_len=3
ft_max_word_len=25
[mysqlhotcopy]
interactive-timeout
MySQL 4.1.22-standard uptime 0 0:39:9 Sat Jun 30 21:33:29 2007
__ Key __________________________________________________ _______________
Buffer used 19.34M of 80.00M %Used: 24.17
Current 33.70M %Usage: 42.12
Write hit 32.57%
Read hit 98.45%
__ Questions __________________________________________________ _________
Total 63.26k 26.9/s
Slow 2 0.0/s %Total: 0.00 %DMS: 0.01
DMS 32.14k 13.7/s 50.80
__ Table Locks __________________________________________________ _______
Waited 40 0.0/s %Total: 0.08
Immediate 50.58k 21.5/s
__ Tables __________________________________________________ ____________
Open 486 of 1800 %Cache: 27.00
Opened 702 0.3/s
__ Connections __________________________________________________ _______
Max used 12 of 500 %Max: 2.40
Total 4.33k 1.8/s
__ Created Temp __________________________________________________ ______
Disk table 26 0.0/s
Table 2.23k 1.0/s
File 428 0.2/s
6-7 vbulletin sites-vbseo and other scripts online avarage;
120 registered user ve 500+ unregistered user
cookie timeout : 7200
unique hit : 15000-20000
KeepAlive ON
MaxKeepAliveRequests 100
KeepAliveTimeout 2
MinSpareServers 10
MaxSpareServers 15
StartServers 10
MaxClients 180
Maxrequestsperchild value 1000
[root@server ~]# uname -a
Linux server.xxxxx 2.6.9-55.ELsmp #1 SMP Wed May 2 14:04:42 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux
[root@server ~]# ulimit -aH
core file size (blocks, -c) 1000000
data seg size (kbytes, -d) unlimited
file size (blocks, -f) unlimited
pending signals (-i) 1024
max locked memory (kbytes, -l) 32
max memory size (kbytes, -m) unlimited
open files (-n) 4096
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) 14335
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
[root@server ~]# cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 15
model : 4
model name : Intel(R) Xeon(TM) CPU 3.60GHz
stepping : 10
cpu MHz : 3600.322
cache size : 2048 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 1
fpu : yes
fpu_exception : yes
cpuid level : 5
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm pni monitor ds_cpl est tm2 cid cx16 xtpr
bogomips : 7207.08
clflush size : 64
cache_alignment : 128
address sizes : 36 bits physical, 48 bits virtual
power management:
processor : 1
vendor_id : GenuineIntel
cpu family : 15
model : 4
model name : Intel(R) Xeon(TM) CPU 3.60GHz
stepping : 10
cpu MHz : 3600.322
cache size : 2048 KB
physical id : 3
siblings : 2
core id : 3
cpu cores : 1
fpu : yes
fpu_exception : yes
cpuid level : 5
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm pni monitor ds_cpl est tm2 cid cx16 xtpr
bogomips : 7199.29
clflush size : 64
cache_alignment : 128
address sizes : 36 bits physical, 48 bits virtual
power management:
processor : 2
vendor_id : GenuineIntel
cpu family : 15
model : 4
model name : Intel(R) Xeon(TM) CPU 3.60GHz
stepping : 10
cpu MHz : 3600.322
cache size : 2048 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 1
fpu : yes
fpu_exception : yes
cpuid level : 5
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm pni monitor ds_cpl est tm2 cid cx16 xtpr
bogomips : 7509.03
clflush size : 64
cache_alignment : 128
address sizes : 36 bits physical, 48 bits virtual
power management:
processor : 3
vendor_id : GenuineIntel
cpu family : 15
model : 4
model name : Intel(R) Xeon(TM) CPU 3.60GHz
stepping : 10
cpu MHz : 3600.322
cache size : 2048 KB
physical id : 3
siblings : 2
core id : 3
cpu cores : 1
fpu : yes
fpu_exception : yes
cpuid level : 5
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm pni monitor ds_cpl est tm2 cid cx16 xtpr
bogomips : 7199.26
clflush size : 64
cache_alignment : 128
address sizes : 36 bits physical, 48 bits virtual
power management:
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Feb 22, 2007
Code:
19:28:57 up 22 min, 2 users, load average: 2.99, 3.48, 3.52
105 processes: 103 sleeping, 1 running, 0 zombie, 1 stopped
CPU states: cpu user nice system irq softirq iowait idle
total 0.0% 0.0% 0.4% 0.0% 0.2% 99.2% 0.0%
cpu00 0.0% 0.0% 0.4% 0.0% 0.4% 99.0% 0.0%
cpu01 0.0% 0.0% 0.4% 0.0% 0.0% 99.5% 0.0%
Mem: 2047220k av, 1020368k used, 1026852k free, 0k shrd, 88516k buff
515212k active, 316448k inactive
Swap: 2040244k av, 0k used, 2040244k free 672648k cached
PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME CPU COMMAND
7775 root 15 0 1344 1344 916 S 0.2 0.0 0:02 0 top
14220 root 15 0 1216 1216 920 R 0.2 0.0 0:00 1 top -c
19768 root 25 0 3764 3764 2216 S 0.4 0.1 0:00 0 /usr/local/cpanel/bin/dcpumon
1 root 15 0 544 544 472 S 0.0 0.0 0:03 0 init
2 root RT 0 0 0 0 SW 0.0 0.0 0:00 0 migration/0
3 root RT 0 0 0 0 SW 0.0 0.0 0:00 1 migration/1
4 root 15 0 0 0 0 SW 0.0 0.0 0:00 1 keventd
5 root 34 19 0 0 0 SWN 0.0 0.0 0:00 0 ksoftirqd/0
6 root 34 19 0 0 0 SWN 0.0 0.0 0:00 1 ksoftirqd/1
9 root 25 0 0 0 0 SW 0.0 0.0 0:00 1 bdflush
7 root 15 0 0 0 0 SW 0.0 0.0 0:00 1 kswapd
Was sorted by processor usage.
Code:
root@dual [/var/log]# uname -a
Linux 2.4.21-47.0.1.ELsmp #1 SMP Thu Oct 19 11:33:45 EDT 2006 i686 i686 i386 GNU/Linux
Code:
Processor Information
Processor #1 Vendor: GenuineIntel
Processor #1 Name: Intel(R) Pentium(R) 4 CPU 3.80GHz
Processor #1 speed: 3790.694 MHz
Processor #1 cache size: 2048 KB
Processor #2 Vendor: GenuineIntel
Processor #2 Name: Intel(R) Pentium(R) 4 CPU 3.80GHz
Processor #2 speed: 3790.694 MHz
Processor #2 cache size: 2048 KB
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Oct 24, 2007
I have a server with two cPanel accounts, each running gallery2. Load has been high:
[url]
[url]
[url]
Sar output (done at a less busy time):
[url]
Hardware:
1 Intel 2.4 GHz 1066FSB - Conroe Xeon 3060 (Dual Core)
2 Generic 1024 MB DDR2 667 ECC
1 Maxtor 250GB SATA 7200RPM MaxLine Plus II
1 Unknown Onboard SATA
1 Dell Single socket 1067FSB - Quad Core Capable PowerEdge 840
Howmuch %iowait is too much?
Since it's using less than 1GB Swap, there's enough RAM?
How do I get more specific than httpd as the cause of the load. The gallery script is the only thing running so is the execution time of PHP the bottleneck? If PHP and apache are single threaded would a quad core reduce load? Does lighttpd run PHP faster?
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Dec 17, 2007
I was wondering if anyone has had luck with 3ware 9650's in a RAID 10 to help bring down iowait?
I currently have a VPS node that see's spikes in iowait and i'd like to bring it down. I've been considering getting a 9650 in a JBOD setup (so then I don't need to reinstall the whole node) with a battery backup to enable the cache.
My two questions are:
- In JBOD, does the write cache enable at all?
- Would the write cache help bring down the iowait much?
Drive wise we have 4 x 500GB drives in a raid10 (soft for now).
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May 30, 2009
Few weeks ago my customer began to notice problem with server load.
I look to munin graphs and see this:
http://dl.getdropbox.com/u/252944/iowait/iowait-hr.png
iowait creates high performance degradation. There was no changes in server software & configuration. Sometimes server work very slow, count of apache processes is high - there is no any processes and scripts who can use a lot of hdd resources.
Sites located on customer server does not create high load, and not subjected to any attacks.
I received response from DC:
I did some research for this and it seems that other people has experienced similar issues and is reporting that it is a kernel bug have you ran yum update to receive the latest kernel if not you can try and update and see if that may resolve your issue.
CENTOS 5.2
Cpanel / WHM
Linux *** 2.6.18-92.1.22.el5PAE #1 SMP Tue Dec 16 12:36:25 EST 2008 i686 i686 i386 GNU/Linux
I try to run "yum update kernel" but it seems installed kernel is up to date.
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Oct 9, 2009
I recently worked on an issue involving a severe performance issue between "write back" and "write through" caching on the RAID/HD.
Long story short, we purchased 12 IBM x3550 M2s came with LSI SAS1068E/SR-BR10i (gimp redheaded stepchild of the MR series. No BBU, no onboard DIMM.) RAID controller and had very bad and inconsistent write throughput with it. Sometimes it writes out 300-400MB/s (dd test, I know... don't flame. I know dd is NOT a good test.), somethings as low as 30MB/s. The server is configured with 2.5" SATA 500GB on HW RAID-1.
From dmesg log it was default to "write through" on sda. I figured out via lsiutil, you can set the drives to "write back". Once we did that, the write performance is more consistent. NOTE, this enables write back on the SATA drives, NOT the controller itself.
I loop out lspci on all our VPS servers. Found out those with LSI (SAS 8344ELP) cards have sda set to "write through w/ FUA". Those are already all RAID-10s, and I have not heard a single complaint from any customer stating poor I/O performance.
I believe the 8344ELP do have a BBU, I can double-check with DC. The DC is on UPS as well. So that rules out the shortcomings of enabling write back caching.
I want to ask those of you using Xen (3.3 & 3.4). Do you guys have better I/O performance with "write back" or "write through" caching? I'm actually looking for real world results. Where you guys actually deployed production VPS server with clients on it.
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Mar 11, 2007
config.php to not have write permissions for everyone? I am running cpanel 10x with whm/extras Here is full report when i try and load fantastico scripts. You must secure this program. Insecure permissions on config.php While installing CSLH you might of needed to change the permissions of config.php so that it is writable by the web server. config.php no longer needs to be written to so please chmod config.php to not have write permissions for everyone. you can do this by UNCHECKING the box that reads write permissions for the file:
Where can i find the box it is talking about?
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Jun 21, 2009
when i am trying to use php my admin i am getting
#1 - Can't create/write to file '/tmp/#sql_bba_0.MYI' (Errcode: 30)
when i am trying to delete a file from /tmp i am getting
rm: cannot remove `sess_***': Read-only file system
i have Linux box with cpanel,
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Jun 20, 2008
I want to make a survey for my small business company (domain names, hosting, web design).
I don't know what is the roadmap to do it. some help link or documentation
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Nov 6, 2009
we have set logrotate for rotate mysqld.log daily
file is compress, deleted and created from logrotate but mysql not write anything
Any idea about why?
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Jun 21, 2007
I use a persistent and session cookie in order to help track return visitors, latent conversions and keyword tracking. My problem is that my hosting company, BlueHost, does not allow me to write the cookie data to my raw access log which would enable me to analyze this information.
Does anyone have any experience with using a script in order to get around this issue and write the cookie data to my log file....or as an alternative can people recommend a good hosting company which enables this functionality?
BlueHost has generally worked fine, so a work-around would be preferred, but if needed I may switch.
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Oct 8, 2007
I have bought 4 servers with DELL SAS 5/iR.
All is fine but the writes are very slow; I supose it's because write cache not enabled.
I have enable it and make some test and there is a lot of difference:
[url]
I'm worried about enabling it because if the server goes down I think it can cause disk corruption and loose data and maybe the OS. What do you think about that? Data is a priority!
Disks have this technology: Seagate-exclusive IRAW (Idle Read After Write) enhances data
protection by verifying—during drive idle time—that data in thedrive buffer was properly written.
The servers are on a datacenter and have RAID 1 with Cheetah® 15K.5 SAS 3Gb/s 146.8-GB Hard Drive - ST3146855SS
[url]
I'm also VERY worried about the coments about this card:
[url]
Is it true that the raid don't get rebuilded? If it is like this I don't know why I'm running raid.
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Apr 15, 2013
I have learned some bits of regular expressions for simple scripting, writing a .htaccess file is, uh, syntaxically daunting.
THE CASE :
The URLs of my site used to be of the form [URL] ... . They are now of the form [URL]......
I am trying to perma-redirect (301) the old format (affiche_fiche.php) to the new format (fiche.php) using a .htaccess.
So far all I have achieved is a hatred of punctuation signs. What's the correct syntax to have a .htaccess that does the redirect ?
THE CONTEXT : The format change took place more than six months ago, but the Google Webmaster Tools still spits 450 problems a day with 404s on URLs using the old format. I had assumed that these would just fade away, but they don't. So I guess that 301'ing them is cleaner. Or would be, if I understood the syntax.
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Mar 15, 2013
how can I rewrite a dynamic image url? URL....
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Feb 20, 2008
I have a cPanel server with 4GB RAM
My server hangs time to time, once or twice a day. This is the last status when it happens.
Server Load 75.90 (2 cpus)
Memory Used 92 %
Swap Used 65.78 %
When I was still inside SSH when it happens, the processes I can see inside "top" are a lot of httpd processes.
So I "killall -9 httpd", I had to do it 30~40 times
#killall -9 httpd
#killall -9 httpd
#killall -9 httpd
x 30~40 times until no pid process found & the server load is back to normal.
Before that, I check httpd fullstatus, they look very normal, same goes to what I see inside WHM Apache status & cpu usage status.
At first I thought it was a memory problem after consulting with a server admin, so I replaced all 4GB new ram stick (such a waste)
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Nov 14, 2014
This is my free -m
total used free shared buffers cached
Mem: 1998 1903 95 0 45 542
-/+ buffers/cache: 1315 683
Swap: 2662 36 2625
Not good ....
I got 5 wordpress and 5 statics website on this server and 100 visitors by 24H00 each day.
Question 1 : Why the memory is so low and the swap so high ?
Question 2 : Why i don't find high usage process in top command ?
Question 3 How can i resolve this problem ?
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Dec 18, 2008
BirdHosting - worth my time to write a review
I just completed my latest site launch with BirdHosting.com and I have to say Mike knows how to operate this hosting company. I've been with ourinternet.us (spare me ever again---please), HostMySite, and GoDaddy. Godaddy was my latest host until I moved it over to Bird. Godaddy didn't give me much flexibility with their VPS windows hosting plans. I needed more then 10 gigs on a windows host.
A buddy of mine referred me to Mike from BirdHosting and Mike had me up and going before I even gave him a credit card. He really wanted to impress and meet all my needs. I now have a 50 gig / 1gig windows vps for a super great monthly price. I enjoy the personal attention I get when something goes wrong.
BirdHosting also helped me pick out two servers for where I work at too. Mike spent over 45 minutes on the phone with me answering questions I had. Godaddy would NEVER do that.
Anyways - I'm enjoying super FAST up time since going over to the birds nest. worth a look at if you are considering hosting companies.
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Oct 31, 2009
My server is very slow, High CPU, High Apache load....
I got a new server and i had setup a script on it.
No server tweaks has been done.
I run a filehosting site so it gets very slow when traffic is high.
Here is some info:
Code:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
4135 filedip 19 0 12812 8892 2212 R 18.9 0.4 0:00.74 index.cgi
3140 apache 15 0 22624 9604 2768 S 17.3 0.5 1:54.45 httpd
3556 apache 15 0 22792 9592 2768 S 17.3 0.5 0:43.53 httpd
3739 apache 15 0 22672 9556 2744 S 17.3 0.5 1:09.67 httpd
3884 apache 15 0 22664 9560 2744 S 17.3 0.5 0:23.98 httpd
3474 apache 15 0 22672 9572 2756 R 16.1 0.5 1:34.09 httpd
3548 apache 15 0 22792 9560 2740 S 16.1 0.5 1:33.67 httpd
3991 apache 15 0 22640 9588 2756 S 15.1 0.5 0:22.44 httpd
3475 apache 15 0 22672 9580 2756 S 13.2 0.5 1:31.42 httpd
3493 apache 15 0 22664 9592 2768 S 12.9 0.5 1:15.52 httpd
3769 apache 15 0 22664 9580 2756 S 12.9 0.5 0:45.19 httpd
3638 apache 15 0 22664 9576 2756 S 12.3 0.5 0:32.82 httpd
3724 apache 16 0 22664 9580 2756 R 12.3 0.5 0:34.25 httpd
3626 apache 15 0 22672 9580 2756 S 11.7 0.5 0:52.54 httpd
4023 apache 16 0 22792 9560 2740 R 11.3 0.5 0:13.16 httpd
3882 apache 15 0 22664 9576 2756 S 10.1 0.5 0:38.56 httpd
3005 apache 15 0 22672 9588 2768 R 9.1 0.5 2:06.61 httpd
I dont know much about server managment...
how to fix this so server doesnt go slow?
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Jul 2, 2009
I have a site that is eating up my server resources and need to know what the best solution for this is. I'm thinking of getting another server just for mysql but do not know what specs the server should be to handle the current traffic/database load and have the site run smoothly without slowing down to a snail's pace.
An alternative is to get another server just for the videos being served and leave the database and html on the current server. This is where I'm stuck and don't know what route to take with this.
My current server stats:
Dual Xeon 5130
4GB RAM
250GB
50 Mbit/sec
CentOS 3.9
Website traffic stats:
15,000 visitors/day
150,000 pageviews/day
Serving videos
I've attached screenshots of top and bandwidth usage per day. Hopefully with this information you could tell me if I need another server or if there are any things I can do to the current server to help things move faster.
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Mar 21, 2009
I have a website built with asp .Net with MS SQL database. The website have some pages that uploads images and files in some folders.
I have tried GoDaddy shared Windows hosting. But they don't seem to allow file upload using a script.
Then I tried GoDaddy Virtual Dedicated. The tech guy told me MS SQL would be part of the hosting. Later I find he lied, there is no MS SQL as part of it.
I am trying to find an affordable hosting that has MS SQL and also allows file upload using script.
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May 19, 2008
one of my site shows this error
MySQL Error: Can't create/write to file '/dev/shm/MYxQT8lz'
I checked space on the server is still 25 GB free,
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