Reduce Backup Load
Jul 6, 2008
we have a dual xeon 2.8G +2G ram CPANEL server normally load is well under2 and stable
we also use Incremental Backup and choose Per Account Only for MySQL backup
This server mainly hosts a big site, whose SQL is 1.2G big
Everytime server is running backup, load burst to 7 and accessing to website hanged. We are thinking to change SQL backup method to Entire MySQL Directory , but was told while it is processing SQL server will be stopped ?? wil Entire MySQL Directory reduce server load while processing SQL backup?
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Feb 24, 2008
1) Use PHP as isapi module
2) Open Internet Information Services (IIS) Manager > Right Click On "Web Sites" select properties > Click Service Tab > Open HTTP Compression > Select Compress Application Files and Compress Static Files
3) Use eAccelerator (PHP accelerator, optimizer, and dynamic content cache) with This options;
eaccelerator.shm_size="64"
eaccelerator.cache_dir="c: mpmmcache"
eaccelerator.enable="1"
eaccelerator.optimizer="1"
eaccelerator.check_mtime="1"
eaccelerator.debug="0"
eaccelerator.filter=""
eaccelerator.shm_max="0"
eaccelerator.shm_ttl="0"
eaccelerator.shm_prune_period="0"
eaccelerator.shm_only="0"
eaccelerator.compress="1"
eaccelerator.compress_level="9"
eaccelerator.keys = "shm"
eaccelerator.sessions = "shm"
eaccelerator.content = "shm"
4) Don't load this extensions,
extension=php_mbstring.dll
extension=php_domxml.dll
extension=php_xslt.dll
Only use this Extensions in php.ini
extension=php_sqlite.dll
extension=php_curl.dll
extension=php_gd2.dll
extension=php_gettext.dll
extension=php_iconv.dll
extension=php_imap.dll
extension=php_mssql.dll
extension=php_sockets.dll
extension="eaccelerator.dll"
upload_tmp_dir= "C:WINDOWSTemp"
This Settings tested on Windows Server 2003 SP2 IIS6 with PHP v4.4.7
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May 5, 2008
I have my WHM/cPanel installation configured with daily and weekly backups. I checked at what time of the day the server load was at the minimum and configured the cPanel backup cron to run then.
The problem now is: Backing up a few hundred accounts results in a high server load. My server configuration:
Dual Processor Quad Core Xeon 5335 2.0GHz with 4GB RAM and 2 x 250GB SATA HDD hosted at SoftLayer.
The accounts are located on the first HDD and the backup archives are placed on the second HDD.
What can I do about this? I'd like to take daily backups of all accounts but not if my server load increases up to 10... That kind of renders the cPanel backup feature useless if it doesn't even work on a powerful server like this one...
Would it help if I use an application such as Auto Nice Daemon to give the backup process a lower priority? But then again that won't work on the MySQL dumps? And I think it's not a CPU problem but an I/O wait problem? Other processes have to wait for disk access because the disk-intensive backup process is running?
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Jun 26, 2007
i have a really high load (100!) at backup time
i'm using cPanel and i'm using Incremental backup option!
is there any solution?
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Jul 9, 2008
to decrease the load in server when daily backup start ,, the load in server before backup start from 0.80 to 1.20 after daily backup started i see very high load from 16.00 to 32 and 40
any solve for decrease load when backup start from 3 to 7 alot
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Jul 14, 2015
Plesk Backup work when we make instant backup but not with scheduled backup.
There is nothing in the log files (pmmcli.log & migration.log).
How can we correct?
Plesk 12 / Centos
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May 20, 2014
PRODUCT, VERSION, OPERATING SYSTEM, ARCHITECTURE
Parallels Plesk Panel 11.5.30 MU #44 CentOS 6.5 (Final) 64bit
2 of our our servers are suddenly experiencing high Wait I/O Times, and high Load Averages during the backup process. During this period the Plesk grinds to a halt, sometimes crashing out completely (although SSh is still possible. We have been in talks with our server suppliers (assuming this would be node related) however they have done a lot of testing etc. and categorically state the node is fine , with no other users affecting it.
STEPS TO REPRODUCE : We backup the server using the scheduled backup service and Wait I/O immediately goes up.
ACTUAL RESULT: Plesk downtime / Website downtime
EXPECTED RESULT: No downtime, successful back up
Some other info :
All other processes (MYSQL, apache, Nginx etc) are all running between 1 - 10%
Partition "/usr" utilization 4.2% used (1.81 GB of 43.3 GB) (?)
Partition "/var" utilization 50.6% used (61.8 GB of 122 GB) (?)
We are struggling to identify what has changed on the server that would cause this sudden change.
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Mar 18, 2008
Last year my web host stated that my site was over utilizing allowed resources for my plan. Specifically, they state that I was overusing the CPU. At the time, I had to upgrade my plan in order to stay online. I would like to move to a new host, but the prospective hosts are all suggesting a dedicated server because of my CPU usage. I don't want to pay that kind of money, so I would really like to curb the CPU problem. Does anyone know how to reduce the CPU of a Wordpress blog? I tried posting this question over at Wordpress.org, but I haven't received a single reply.
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Mar 18, 2008
My server details
Intel 2.4 Ghz P4 Celeron
os-redhat
RAM-2GB DDR
harddisk-160+50Gb
bandwith-3000Gb
now iam haveing more that 0.50-1.20 cpu useage,also cpu useage is also increased i hosted only 6 site out what only one site use MSQL all other site are plain download site,how to reduce the cpu load can u figure me out this issue also give me some tips to reduce the cpu usage
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Jul 3, 2008
13438 nobody 15 0 42276 22m 13m R 22 2.2 1:51.94 httpd
10620 nobody 16 0 41928 16m 8468 S 19 1.7 0:28.54 httpd
11397 nobody 15 0 41524 12m 4784 S 18 1.3 0:06.04 httpd
10745 nobody 15 0 42376 14m 5316 S 17 1.4 0:06.62 httpd
The values in bold are the CPU percentage taken up by each apache process.
So i had to need to each apache process,who can i reduce it?what config i have to change to reduce it?
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Jul 7, 2007
apparently the sysctl commands / config does not work for VPS's. any way to reduce the time_wait period? got nearly 900 connections in that state!
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Jul 9, 2007
I have smokeping monitoring my game servers and so far in the little time that it has been running all my game servers have been encountering an average of 4 to 10% packet loss. Are there are tweaks i can run on the server computer to reduce packet loss? (registry modifications, etc.)
I downloaded a TCP tweak program called "TCP Optimizer" is it safe to run on a Windows 2003 Server OS?
The colo connection is an OC 192 and i have a 100Mbit ethernet card.
Here are my current TCP settings:
Quote:
[SYSTEMCurrentControlSetServicesTcpipParameters]
TcpWindowSize=-1
GlobalMaxTcpWindowSize=-1
EnablePMTUDiscovery=-1
EnablePMTUBHDetect=-1
SackOpts=-1
DefaultTTL=-1
TcpMaxDupAcks=-1
Tcp1323Opts=-1
DisableUserTOSSetting=-1
DefaultTOSValue=-1
[SYSTEMCurrentControlSetServicesAfdParameters]
DefaultReceiveWindow=-1
[SoftwareMicrosoftWindowsCurrentVersionInternet Settings]
MaxConnectionsPerServer=-1
MaxConnectionsPer1_0Server=-1
[SYSTEMCurrentControlSetServicesICSharingSettingsGeneral]
InternetMTU=-1
[SOFTWAREMicrosoftWindowsCurrentVersionExplorerRemoteComputerNameSpace{D6277990-4C6A-11CF-8D87-00AA0060F5BF}]
{D6277990-4C6A-11CF-8D87-00AA0060F5BF}=-1
[SYSTEMCurrentControlSetServicesDnscacheParameters]
MaxNegativeCacheTtl=-1
NegativeCacheTime=-1
NetFailureCacheTime=-1
NegativeSOACacheTime=-1
[SOFTWAREPoliciesMicrosoftWindowsPsched]
NonBestEffortLimit=-5
[SYSTEMCurrentControlSetServicesTcpipServiceProvider]
LocalPriority=499
HostsPriority=500
DnsPriority=2000
NetbtPriority=2001
[SystemCurrentControlSetServicesLanmanServerParameters]
SizReqBuf=-1
[SYSTEMCurrentControlSetServicesNdisWanParametersProtocols]
ProtocolMTU=-2
[SYSTEMCurrentControlSetServicesTcpipParametersInterfaces{D63AC0FA-D2C9-4D83-B057-31A353516AB3}]
MTU=-1
TcpWindowSize=-1
[SYSTEMCurrentControlSetServicesPschedParametersAdapters{D63AC0FA-D2C9-4D83-B057-31A353516AB3}]
NonBestEffortLimit=-2
[SYSTEMCurrentControlSetServicesTcpipParametersInterfaces{8190D94A-3B2D-45C4-998D-312E99D6061D}]
MTU=-1
TcpWindowSize=-1
[SYSTEMCurrentControlSetServicesPschedParametersAdapters{8190D94A-3B2D-45C4-998D-312E99D6061D}]
NonBestEffortLimit=-2
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Jan 24, 2007
I know there is no device can protect you from ddos attacks, but I wonder which one is the best to help you reduce the attacks? It might be intelligent to "feel" the attacks? Brand names from Cisco, Foundry, Nokia...?
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Mar 3, 2009
How to reduce downtime - multiple name servers ?
Say I have two different hosting accounts at two different web hosts. One at host1.com and another at host2.com. In both the hosts I keep the same files. I use an external registrar and use the name servers for one of my domains as follows:
ns1.host1.com
ns1.host2.com
ns2.host1.com
ns2.host2.com
What would happen in that case, if say host1 is down sometime? Will the name servers point to host2.com?
If this could work, then the probability of downtime of a site would become almost 0 .
Google will like this ?
Another question is how to easily sincronize both cpanel accounts?
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Apr 18, 2009
Few months ago I bought new small VPS box (OpenVZ, 128 MB RAM) in order to place there a new monitoring node of my site monitoring system. Such small amount of RAM is a challenge for operating system optimisation techniques (OpenVZ doesn’t have “swap” as Xen does).
First of all I discovered that apache2-mpm-worker (Apache implementation that uses threads) consumes more memory (100MB) than the classic version that use separate processes (20MB). I had to switch to apache2-mpm-prefork version then.
Next unpleasant suprise: small Python app eats 100MB of virtual memory! I checked that virtual (not resident) memory is taken into account by VPS. I applied some tools to locate memory bottleneck, but without success. Next I added logs with current memory usage to track call that causes big memory consumption. I tracked the following line:
server = WSGIServer(app)
is guilty for high memory increase. After few minutes of googling I located problem: default stack size for a thread. Details:This line creates few threads to handle concurrent calls
Stack size is counted towards virtual memory
Default stack size is very high on Linux (8MB)
Every thread uses separate stack
=> multi threaded application will use at least number_of_threads * 8MB virtual memory!
First solution: use limits.conf file. I altered /etc/security/limits.conf file and changed default stack size. But I couldn’t make this change to alter Python scripts called from Apache (any suggestions why?).
Second (working) solution: lower default stack size using ulimit. For processes launched from Apache I altered /etc/init.d/apache2 script and added:
ulimit -s 256
Now every thread (in apache / Python application) will use only 128 kB of virtual memory (I lowered VSZ from 70 MB to 17 MB this way). Now I have additional space to enlarge MySQL buffers to make DB operations faster.
There’s even better place to inject ulimit system-wide: you can insert this call in:
/etc/init.d/rc
script. Then ulimit will be applied to all daemons (as Apache) and all login sessions. I reduced virtual memory usage by 50% this way.
Note: you may increase stack size on stack overflow errors. In my opinion 256 kb is safe option for most systems, you may increase if in doubt. Still memory savings are big.
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Apr 20, 2009
its 2am night here, and my sites are down....now there is no way i have too much traffic at midnight, also all my websites are new !
this is happening consistently since today morning and im getting no support apart from jargon filled replies from customer care
how do i tweak apache settings and what settings do i make to avoid this ?
im wondering what will happen after few months when my websites actually have good traffic coming in ?
We have checked your server. Please see the load average and process list given below:
The value 4.42 was the CPU load average at the time. A normal load should be below 1.00. I could see that Apache service is causing high load in your server.
So you can tweak Apache in order to reduce the CPU load. Please check and let us know if you need any further assistance.
++++++++++++++++++
[root@chi07 ~]# vzctl exec 18403 w
03:16:20 up 2 min, 0 users, load average: 4.42, 1.42, 0.50
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
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Oct 29, 2008
I have registered a domain using godaddy. I have hosted my site on a server of my shared hosting provider(lets call them X).Currently I have pointed mydomain.com to the server and it is up and running.Sometimes, I have experienced downtimes.
In order to solve this problem, I have hosted a clone of my site on another server from another hosting company(lets call them Y).
1. I want mydomain.com to point to Y when X is down
2. again point it to X when it is up.
My main aim is to have my site live with less downtime. The probability having both servers down is very less.
I dont know if it is technically feasible, just a thought out of dirty mind. I tried to google but was not able to find an answer specific to my problem.
Can anybody tell me how to achieve this through godaddy domain.
Added note, My site is not a commercial site and I cant afford large dedicated servers with clustering and failovers.
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Oct 31, 2008
I would like to know if there's any way we could reduce "conversion times" for videos while converting them with "mencoder" and "x264 codec"?
Is it possible to cluster 2-3 or more servers (Quad core/8GB RAM) so that I can reduce the conversion timings effectively?
The original video sizes are around 500-700MB on an average and I'd like to convert them using mencoder in x264 codec @ 500Kbps bitrate and 2pass settings.
Ofcourse it'll take atleast 1-2hours to encode 1 such video at these settings on a 'single' such server, so is there a way to reduce the conversion times to around 10-15minutes/video by using "parallel encoding" with x264 codec?P.S: I know how to form a cluster, using beowulf/rocks, etc...what I need help with is 'using' the cluster with x264 codec
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Aug 26, 2014
Basically I would like to record only certain status code entries in my access log. For example I would like to skip all entries with 200 status.
The documentation under "Modifiers" [URL] .... works somewhat but it still makes an entry in the AccessLog file.
This line in httpd.conf
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Mar 19, 2007
I did a quick search on this and could not see it as already being posted
It seems quite a clever but simple idea - remove a lot of the oxygen from the air to help reduce the risk of fire. What do those of you operating your own facilities make of this? Is anyone already doing this?
[url]
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Mar 28, 2009
i want to edit "Reduce your SELECT DISTINCT queries without LIMIT clauses" in my my.cnf.
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Dec 20, 2007
I've been having trouble with my VPS for a while now. In the QoS alerts page in Virtuozzo it seems to be a problem with numtcpsock and tcprcvbuf, mainly numtcpsock.
Copy these into the browser:
i18.photobucket.com/albums/b106/gnatfish/qosnumtcpsock2.jpg
And when i run cat /proc/user_beancounters:
i18.photobucket.com/albums/b106/gnatfish/beancounters2.jpg
This line is particularly scary:
numtcpsock 164 164 166 166 7321
What do i need to do, to get the website running again? It's only one site on the vps a proxy. So i thought a vps would be able to handle one proxy.
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May 6, 2008
Anyone know of some good server load testers ( commercial )?
Im not looking for application based load testing, I need real web server load testing... need to see how much traffic this one site can take before it cries.
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Aug 12, 2008
I'm having the oddest issue. For some reason, some of the websites on my server load fine, and some take a really long time to load (2 minutes).
Now, the server load is fine, and the size of the sites aren't the issue either. I've restarted Apache and a couple more services, and still the same sites seem to load very slow.
What could be causing this since it's only effecting certain websites?
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