What Is Considered To Be High Disk I/O?
Jan 8, 2008
What is considered to be high disk I/O?
Here's what I have in cPanel
Device Trans./Sec Blocks Read/sec Blocks Written/Sec Total Blocks Read Total Blocks Written
sdb 17.34 28.97 205.08 1258108 8906492
sdb1 0.01 0.03 0.00 1214 4
sdb2 16.84 15.99 120.88 694646 5249768
sdb3 6.32 8.89 48.33 386190 2099064
sdb5 1.59 2.83 12.05 122762 523288
sdb6 0.01 0.02 0.00 980 0
sdb7 2.13 1.14 15.77 49550 684992
sdb8 1.02 0.06 8.04 2726 349376
And I think it's going really slow because of disk writes... but do these numbers support that theory?
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Dec 25, 2007
Looking for 2X4U colocation. Need to maintain a balance between overseas and US users. 60% users are overseas in India and 40% in US and Europe.
What effects geographic location of colo has on performance or access speed of the application? Is downloading a test file the best test for performance of a colo? Can that be misleading? What other tests should be considered before making a decision on colo choice?
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Apr 5, 2009
a certain host I've been with for over 6 months now experiences what I would consider always very high server load. The server load is normally around 4-6ish, rarely below that. A few times a day it spikes to around 12ish, sometimes even more. The server has 4 cpus. Is this just some really big time overselling? They had downtime once for 2 days when a server crashed, and after that the server load has been really high, when before that it was normally around 1-2, and in the 0.50s
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Apr 29, 2008
My server has a small SAS disk(about 73G), if I use 90% diskspace of it, is it good idea, will it harm the physical HDD?
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Jan 8, 2009
I am looking for better disk performance. Due to the tight budget, I have to choose one of following options as my disk choice:
2 SATAII disk w/RAID0, 7200rpm, 32M cache for each disk
1 SAS disk, 15000rpm, 16M cache.
which one will be better and how better if other things(hardware & OS) are same?
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Sep 1, 2008
can a Xen disk image be converted to a diskpartition?
Someone is asking whether I can host his disk image at his current host, which he is leaving for poor I/O (wonder why that would be ). I can host a diskimage, but I don't like diskimages (slow, and 100GB isn't very 'comfortable' either). Is there any way out there to convert a disk image into a normal partition?
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Apr 24, 2013
I use apache with CentOS VPS hosting for my blog. I only host one blog in this VPS account. I have 1.5GB RAM and I have 7, 500 page preview per day. My page loading time is 2-3 seconds (according to the pingdom tool).
I want to know what is the best performance (faster web page loading) W3 Total cache option for VPS hosting blog. Currently I use Disk to enhance for page cache and database cache for disk.
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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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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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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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Nov 8, 2008
I have extremely high CPU load average, but when I run TOP command there are not any process with high CPU
CPU load averages:
211.65 (1 min) 227.29 (5 mins) 247.89 (15 mins)
Tasks: 364 total, 2 running, 360 sleeping, 2 stopped, 0 zombie
Cpu(s): 0.0%us, 0.3%sy, 0.0%ni, 0.0%id, 99.7%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 2065460k total, 2012372k used, 53088k free, 60964k buffers
Swap: 2040212k total, 3280k used, 2036932k free, 619900k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
19871 root 15 0 4944 2488 1656 R 1 0.1 0:02.73 top
1 root 15 0 4208 1320 1136 S 0 0.1 0:01.55 init
2 root RT 0 0 0 0 S 0 0.0 0:00.00 migration/0
3 root 34 19 0 0 0 S 0 0.0 0:01.77 ksoftirqd/0
4 root RT 0 0 0 0 S 0 0.0 0:00.01 migration/1
5 root 34 19 0 0 0 S 0 0.0 0:01.16 ksoftirqd/1
6 root 10 -5 0 0 0 S 0 0.0 0:01.04 events/0
7 root 10 -5 0 0 0 S 0 0.0 0:00.65 events/1
8 root 10 -5 0 0 0 S 0 0.0 0:00.00 khelper
9 root 11 -5 0 0 0 S 0 0.0 0:00.00 kthread
35 root 10 -5 0 0 0 S 0 0.0 0:00.15 kblockd/0
36 root 10 -5 0 0 0 S 0 0.0 0:00.00 kblockd/1
37 root 15 -5 0 0 0 S 0 0.0 0:00.00 kacpid
127 root 10 -5 0 0 0 S 0 0.0 0:13.16 ata/0
128 root 16 -5 0 0 0 S 0 0.0 0:00.00 ata/1
129 root 10 -5 0 0 0 D 0 0.0 0:01.15 ata_aux
130 root 10 -5 0 0 0 S 0 0.0 0:00.00 kseriod
158 root 16 0 0 0 0 S 0 0.0 0:00.00 pdflush
159 root 15 0 0 0 0 D 0 0.0 0:01.00 pdflush
160 root 10 -5 0 0 0 S 0 0.0 0:10.68 kswapd0
161 root 11 -5 0 0 0 S 0 0.0 0:00.00 aio/0
So my server is "unresponsive" for abour 18 hours, burst net didnt answer my tickets and I dont know what to do. Ive been with this setup for almost 5 months with no problems, No changes have been made to hardware or software.
Im using Centos 5.0
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Jan 17, 2007
Under Service Status, the "Disk (dev) 100 % ", what should I do?
FreeBSD with cPanel installed.
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May 20, 2009
My server load is high, i checked and see everuthing is ok.
I think my sata disk cannot support my hard disk traffic.
Is it posible to check wich file used more hard disk traffic? (rpm speed)
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May 27, 2009
how can i reduce this value
it was at 70% but after i did wget for abig backup and its failed i get this value in dev/sda5
Quote:
[root@xx]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda5 4.0G 3.6G 196M 95% /
/dev/sdb1 135G 111G 18G 87% /backup
/dev/sda1 198M 40M 148M 22% /boot
none 3.0G 0 3.0G 0% /dev/shm
/dev/sda8 76G 37G 36G 51% /home
/dev/sda7 2.0G 37M 1.9G 2% /tmp
/dev/sda3 25G 6.0G 18G 26% /usr
/dev/sda2 25G 20G 4.4G 82% /var
/tmp 2.0G 37M 1.9G 2% /var/tmp
alos
Quote:
[root@xxxx]# du -h --max-depth=1
1.8M ./tmp
8.0K ./opt
1.2M ./namedOLD
728K ./named
84K ./profiles
18G ./lib
423M ./cpanel
4.0K ./portsentry
28K ./empty
16K ./lost+found
288K ./run
672M ./cache
8.0K ./local
8.0K ./preserve
28K ./db
217M ./log
1.2M ./www
40K ./lock
16K ./crash
8.0K ./nis
8.0K ./net-snmp
24K ./yp
12K ./account
100K ./netenberg
170M ./spool
19G .
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Apr 27, 2009
As per this [url]tutorial to set up disk quotas u need the /Home in the fstab file but how ever all i can find on my server is this:
LABEL=/ / ext3 defaults 1 1
LABEL=/disc2 /disc2 ext3 defaults 1 2
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
LABEL=SWAP-sdb2 swap swap defaults 0 0
LABEL=SWAP-sda2 swap swap defaults 0 0
How do i go about setting quota for my users
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May 5, 2009
shared hosting env?
/etc/sysctl.conf:
vm.dirty_background_ratio = 20
vm.dirty_ratio = 60
blockdev --setra 16384 /dev/sda
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Oct 21, 2009
I have a VPS that has hard limits for Disk Inodes at 500,000. I am currently over 430,000.
I am only using 24GB of 40GB of disk space.
How do I find what is gobbling up disk inodes? How can I find unused, abusive or unnecessary disk inodes and remove them?
# df -i
Filesystem Inodes IUsed IFree IUse% Mounted on
/dev/vzfs 500000 430553 69447 87% /
/dev/simfs 500000 430553 69447 87% /tmp
/dev/simfs 500000 430553 69447 87% /var/tmp
none 2049640 95 2049545 1% /dev
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Mar 26, 2008
From the Disk I/O performance is it better
1) to have main PHP file with 10 includes
2) all 11 files as one file
3) the difference is not big
Suppose
a) a low traffic site
b) a high traffice site
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Jun 28, 2008
I have a server with cpanel/WHM. The file system says I am using 26GB of my 40GB:
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 40G 26G 14G 66% /
none 257M 0 257M 0% /dev/shm
/usr/tmpDSK 243M 4.1M 226M 2% /tmp
/tmp 243M 4.1M 226M 2% /var/tmp
however the total of my accounts is less than 5GB.
How can I find out where all the other disk space is being used?
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Nov 1, 2008
partitionning a server disk.
I have a 76 gb disk which is partitioned this way :
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sdb5 10317828 319000 9474712 4% /
/dev/sdb1 101086 24171 71696 26% /boot
none 3114756 0 3114756 0% /dev/shm
/dev/sdb7 36384624 17595080 16941268 51% /home
/dev/sdb8 1035660 34732 948320 4% /tmp
/dev/sdb3 10317860 4959788 4833952 51% /usr
/dev/sdb2 10317860 4847048 4946692 50% /var
/tmp 1035660 34732 948320 4% /var/tmp
I would like to create the same kind of partition on another server, but the disk is 750 gb and I need /var to be at least 30 gb big.
How big must the other partitions be ?
Regarding "none" ---> /dev/shm,
I don't understand very well. Do I have to create this partition myself ?
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Apr 18, 2008
How do I decrease my disk inodes usage?
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Mar 8, 2008
Good day All
the Disk /dev/sda5 (/var) 96 % Full
What I do
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Jul 21, 2007
i Have 2 vps From Swvps and HostForWeb
When Finish Transfer Old VPS( HostForWeb ) To New VPS (Swvps.com) and See Disk Usage
Swvps=> 13 gig Usage
HostForWeb=> 23 gig space!
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May 13, 2008
I've got a server in a local colo facility. both the facility and my server are slowly falling apart. Rather than investing in hardware and then shipping it to some location and hoping it doesn't break, I've decided to investigate VPS.
What I am finding is puzzling me. Why do providers charge so much for disk space? My current old p3-733 has a 30gb drive, I could deal with about 15gb but with some 'flex' room (i.e. a virtual drive for uncompressing files or some such). It's a personal server for me and a couple of friends, it doesn't get much traffic, I don't need a heck of a lot of bandwidth, nor anything flashy, just Ubuntu 8.04. I see places offering plenty of traffic for a decent price, yet little in the way of storage. I just don't get it.
A year ago I was here wanting to trade my class C for a dedicated server. I realize now that it would be pretty difficult for providers to do this, because if I wanted to yank my class c they'd have to renumber. But if anyone is still interested, let me know.
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Jun 22, 2008
I've decided I want cPanel installed on my iWeb dedicated box. They informed me it will require a reinstall. Before they do this I wanted to image the disk and download the image to my PC. Is this possible to do via SSH? I'd prefer an open-source free solution.
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May 16, 2008
I have a site with a lot of data (almost 20-30gigs). I want to pkgacct the site to transfer to another server but the harddisk gets full and the pkgacct stops working.
Which files and folders can I delete on the server without touching critical CPanel files? I want to delete as many as folders so that I can have enough space for the packaging process.
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Oct 8, 2007
i having an issue with FreeBSD...
I have a Raid5 setup and working fine, I just put 2 new 18gig drives for raid1.
Now i see in dmesg this.
amrd0: <LSILogic MegaRAID logical drive> on amr0
amrd0: 104193MB (213387264 sectors) RAID 5 (optimal)
amrd1: <LSILogic MegaRAID logical drive> on amr0
amrd1: 17365MB (35563520 sectors) RAID 1 (optimal)
In bold is the 'new' array.
in fdisk i get....
fdisk /dev/amrd1
******* Working on device /dev/amrd1 *******
parameters extracted from in-core disklabel are:
cylinders=2213 heads=255 sectors/track=63 (16065 blks/cyl)
Figures below won't work with BIOS for partitions not in cyl 1
parameters to be used for BIOS calculations are:
cylinders=2213 heads=255 sectors/track=63 (16065 blks/cyl)
fdisk: invalid fdisk partition table found
Media sector size is 512
Warning: BIOS sector numbering starts with sector 1
Information from DOS bootblock is:
The data for partition 1 is:
sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD)
start 63, size 35551782 (17359 Meg), flag 80 (active)
beg: cyl 0/ head 1/ sector 1;
end: cyl 164/ head 254/ sector 63
The data for partition 2 is:
<UNUSED>
The data for partition 3 is:
<UNUSED>
The data for partition 4 is:
<UNUSED>
I get write errors when i use sysinstall. As for the raid status. Its fine.
Logical Drive : 1( Adapter: 0 ): Status: OPTIMAL
---------------------------------------------------
SpanDepth :01 RaidLevel: 1 RdAhead : Adaptive Cache: CachedIo
StripSz :064KB Stripes : 2 WrPolicy: WriteThru
Logical Drive 1 : SpanLevel_0 Disks
Chnl Target StartBlock Blocks Physical Target Status
---- ------ ---------- ------ ----------------------
0 00 0x00000000 0x021ea800 ONLINE
0 03 0x00000000 0x021ea800 ONLINE
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Jun 19, 2007
One of the things people seem to bring up a lot is disk IO Performance.
Why? Because theres little you can do about a customer being stupid and creating a disk swap nightmare.
There is however something you can do to reduce the impact across your clients, Have a separate raid array for swap space.
This does 2 things, it splits some of the Disk IO across 2 arrays, but more important it reduces the affect someone overusing there swap will have on the ones that are not.
Just my quick 10 cents for the day.
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