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Thread: server loads !

  1. #1
    Join Date
    Jan 2006
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    server loads !

    Hi,

    What is exceptable loads on a vps

    I have an top end vps 2gb ram but always see %wa hitting 14.0

    is there any progs i can install to monitor loads

    regards

    keith
    VPS & Dedi with -
    Clustered net (5/10), Rapidswitch (8/10) XtraHost (8/10), RackSRV (9/10) futurehosting (7/10)

  2. #2
    Munin should do the trick. The %wa is the i/o wait time, and is related to your disks.
    478east
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  3. #3
    Join Date
    Feb 2004
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    Sacramento CA
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    That seems more then a bit high. I get concerned if I start seeing server load hit 5 on any type of frequency.

    http://www.sysadmin.md/web-based-too...r-servers.html

    Cacti
    Ganglia
    Hyperic HQ
    Monit
    Munin
    Nagios
    OpenNMS
    PRTG (freeware version)
    phpSysInfo
    SmokePing
    System Health Monitor
    Xymon
    Zabbix
    Zenoss Core
    Logcheck
    Logwatch

  4. #4
    Join Date
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    Jax, FL
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    What virtualization technology is the provider utilizing? It sounds like an oversold hardware node where you have some heavy users and you are a victim of the shared nature of a VPS.

    Xen is a bit better about preventing this from happening, but it is still susceptible to such performance hits.

  5. #5
    Join Date
    Jan 2006
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    582
    Im on servints ultimate vps, virtousso/plesk, centos 5.3, 2gb ram burst 4gb

    With high spec and less vps's per node, just means each vps could host loads more sites hitting the resources harder, swings and round-a-bouts i guess

    Support always says we dont see the high loads, let us know when this happens again, but they respond upto 3hours later

    Here is the current top results

    top - 15:45:06 up 7 days, 37 min, 1 user, load average: 0.72, 0.41, 0.35
    Tasks: 87 total, 1 running, 84 sleeping, 0 stopped, 2 zombie
    Cpu(s): 0.9%us, 0.5%sy, 0.0%ni, 66.7%id, 32.0%wa, 0.0%hi, 0.0%si, 0.0%st
    Mem: 4194304k total, 1070624k used, 3123680k free, 0k buffers
    Swap: 0k total, 0k used, 0k free, 0k cached
    PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
    26310 apache 18 0 305m 35m 18m S 3.7 0.9 0:00.31 httpd
    14007 apache 15 0 306m 47m 29m S 2.7 1.2 0:00.87 httpd
    30561 apache 15 0 306m 29m 10m D 1.3 0.7 0:00.18 httpd
    26344 apache 18 0 306m 46m 28m S 1.0 1.1 0:00.50 httpd
    25672 root 15 0 2124 1056 820 R 0.7 0.0 0:03.26 top
    1 root 18 0 1988 652 560 S 0.0 0.0 0:02.82 init
    4063 postfix 15 0 6976 2440 1980 S 0.0 0.1 0:00.04 smtp
    5168 root 15 0 32268 29m 2336 S 0.0 0.7 0:24.10 spamd
    5924 matchmeu 19 0 8120 2176 1332 S 0.0 0.1 0:00.00 crond
    5927 urban 18 0 8120 2192 1336 S 0.0 0.1 0:00.00 crond
    5928 urban 21 0 8120 2192 1336 S 0.0 0.1 0:00.00 crond
    5935 urban 22 0 0 0 0 Z 0.0 0.0 0:00.00 curl <defunct>
    5936 urban 18 0 0 0 0 Z 0.0 0.0 0:00.00 curl <defunct>
    5944 matchmeu 18 0 28304 11m 6320 S 0.0 0.3 0:00.10 php
    5953 urban 20 0 6800 1736 1384 S 0.0 0.0 0:00.00 sendmail
    5955 urban 18 0 6804 1740 1384 S 0.0 0.0 0:00.00 sendmail
    5959 urban 18 0 6772 1700 13
    VPS & Dedi with -
    Clustered net (5/10), Rapidswitch (8/10) XtraHost (8/10), RackSRV (9/10) futurehosting (7/10)

  6. #6
    Join Date
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    India
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    Post the top and sar command output in their forum and see what Bob others have to say about it, I am pretty sure you will get a positive response.

  7. #7
    Join Date
    Feb 2008
    Location
    Houston, Texas, USA
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    2,955
    Hi,

    Based on top, you are barely using 1/4 of the amount of RAM you're allocated. The hard drives do seem to be overloaded so this is something only your provider can resolve. Take the same top output you have pasted here and ask them to investigate the root cause. Most likely a VPS on the same server is hitting the disk hard (or remote VPS if this is a SAN).

    These problems could be resolved by getting a Xen node instead. So ask your provider to move your VPS to such technology. I believe they're managed.

    Regards
    Last edited by UNIXy; 10-16-2009 at 08:04 PM.
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  8. #8
    Join Date
    Jan 2006
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    Ive posted this to their forum

    but as far as there support goes, there is nothing that can be done to help this
    so anyone can hog the disks and effect all vps on the node :-(

    I would think my only option is to get rid of ultimate and go back to signature plan and start looking around for non overloaded vps

    Some days my sites load in 4 sec other days its over 20secs and grahics time out
    very frustrating to me and my clients

    Thanks to all

    Keith
    VPS & Dedi with -
    Clustered net (5/10), Rapidswitch (8/10) XtraHost (8/10), RackSRV (9/10) futurehosting (7/10)

  9. #9
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    Quote Originally Posted by keith007 View Post
    so anyone can hog the disks and effect all vps on the node :-(
    And that is what is the problem with most VPS solutions - Memory and CPU are resources which can be defined and limited by most virtualization packages, but disk IO is something which can not be individually limited. You see the same issues on some clouds (or maybe even all) as well; so some start to offer bare-metal clouds with own disks as a solution to this problem.

  10. #10
    Join Date
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    India
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    Quote Originally Posted by keith007 View Post
    Ive posted this to their forum

    but as far as there support goes, there is nothing that can be done to help this
    so anyone can hog the disks and effect all vps on the node :-(

    I would think my only option is to get rid of ultimate and go back to signature plan and start looking around for non overloaded vps

    Some days my sites load in 4 sec other days its over 20secs and grahics time out
    very frustrating to me and my clients

    Thanks to all

    Keith
    Tell me about it, have suffered from this issue on all my previous VPS hosts, touch wood, ServInt so far has been good with it.

  11. #11
    Join Date
    Jan 2006
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    582
    well i put in a request to be moved

    failing that I think dedicated is the best way, at least there will be just me, maybe slower but constant

    Keith
    VPS & Dedi with -
    Clustered net (5/10), Rapidswitch (8/10) XtraHost (8/10), RackSRV (9/10) futurehosting (7/10)

  12. #12
    Join Date
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    EU - east side
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    And that is what is the problem with most VPS solutions - Memory and CPU are resources which can be defined and limited by most virtualization packages, but disk IO is something which can not be individually limited.
    This may be coupled with a tendency of people to use VPSes as a way to minimize costs and thus trying to extract as much juice as possible out of them. They have to stick to the limits of their guaranteed resources and they'll make sure they do that, but I/O just isn't a worry.

    It should be the provider's job to address any such issues, and, just like many shared hosting providers do, guide the "abusive" customer(s) towards a product that fits his particular needs. Anything else can arguably constitute poor management.

  13. #13
    Join Date
    Oct 2006
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    Upgrading to a dedicated server is probably best.
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