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Regular WHM processes taking too much I/O

Discussion in 'Workarounds and Optimization' started by postcd, Aug 20, 2014.

  1. postcd

    postcd Well-Known Member

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    Hello,

    i think around daily WHM server I/O become too high thanks to these proceses:

    cpanellogd - processing bandwidth
    updatedb -f sysfs
    updatenow.static-cpanelsync
    whostmgr ./simpleps
    rpm -vV MySQL55-client MySQL55-d~er cpanel-perl-514-Class-Factory-*
    rpm -qa --queryformat %{NAME} %{VERSION}-%{RELEASE}\n
    python /usr/bin/yum -y update
    python -tt /usr/libexec/yum-updatesd-helper --check --dbus

    these are most IO users when do command "iotop -a"

    im not sure why these are made to be running all at same time to overload the server, how can i modiffy WHM to not do all these at same time or eliminate I/O issue?

    thx
     
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    #1 postcd, Aug 20, 2014
    Last edited: Aug 20, 2014
  2. cPanelMichael

    cPanelMichael Technical Support Community Manager
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    Hello :)

    Most of those processes likely stem from a cPanel update (upcp). When you say the I/O is too high, could you elaborate more on the exact levels? Is your server speed slowed significantly?

    Thank you.
     
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    #2 cPanelMichael, Aug 20, 2014
  3. postcd

    postcd Well-Known Member

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    not sure how you mean elaborate IˇO levels, but above mentioned are usually on the top of "iotop -a" process list with more than 90% io most time. slowness can be felt during loading hosted sites, and especially WHM/cpanel control panel pages in webbrowser, which hangs even 8 seconds before loading page, usually its 4 seconds

    my initial question was not responded
     
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    #3 postcd, Aug 20, 2014
  4. cPanelMichael

    cPanelMichael Technical Support Community Manager
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    You can modify the time at which the cPanel update occurs, but you can't change what happens when cPanel updates. You may receive more user-feedback if you post the output of iotop.

    Thank you.
     
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    #4 cPanelMichael, Aug 20, 2014
  5. postcd

    postcd Well-Known Member

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    what about changing linux nice value of the updates regarding I/O / where to do??


    I found cpanel cronjob tasks (like update, backup) can be set in:

    Home »Server Configuration »Update Preferences
    Home »Server Configuration »Configure cPanel Cron Jobs

    But times probably not much recommended to change..

    An Idea: it may be good to modiffy cronjob time so it dont overlaps with other custom cronjobs on the server.

    Example i have some crons in /etc/cron.daily /etc/cron.weekly, etc/cron.monthly

    the times these runs can be probably modiffied in file:
    /etc/cron.d/dailyjobs

    so make sure it dont overlaps with cpanel conjobs at Home »Server Configuration »Configure cPanel Cron Jobs

    Good hint on cronob times can be server load average graph provided by Config server firewall WHM plugin, "View System Statistics" section
     
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    #5 postcd, Aug 21, 2014
    Last edited: Aug 21, 2014
  6. cPanelMichael

    cPanelMichael Technical Support Community Manager
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    You can configure I/O priority levels for some processes under the "System" tab in "WHM Home » Server Configuration » Tweak Settings", however it's not configurable for "upcp". The cPanel update is comprised of several different sub-processes.

    Thank you.
     
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    #6 cPanelMichael, Aug 21, 2014
  7. markhard

    markhard Well-Known Member

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    i also seeing high I/O on those processes, especially when cpanellogd processing log and updatedb -f sysfs

    i'm thinking to add SSD disk to remedy the I/O and plan to move related files to cpanellogd to that SSD. my question is where does cpanellogd files located? and if it use some kind of temporary path to work on the logs, where is it located?

    regarding the updatedb -f sysfs, is it needed by cpanel to operate properly?
     
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    #7 markhard, Aug 28, 2014
  8. cPanelMichael

    cPanelMichael Technical Support Community Manager
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    You could remove the "mlocate" package through YUM if you don't need to use the "locate" command. This will stop the "updatedb" process. As far as cpanellogd, moving it is not really feasible. However, you can browse to the "Stats and Logs" tab in "WHM Home » Server Configuration » Tweak Settings" and modify the following option:

    "Extra CPUs for server load"

    The load average above the number of CPUs at which cpuwatch, cpanellogd, backups, and CPU stats consider the system to be in a critical load state. For example, a server with 4 physical CPUs and a value of 2 in this field will be considered “critical” in these cases once the load reaches 6.

    Thus, you can ensure statistics generations are suspended when the load reaches a certain point. Also, under the "System" tab, you can modify:

    "I/O priority level at which stats logs are processed"

    Thank you.
     
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    #8 cPanelMichael, Aug 28, 2014
  9. postcd

    postcd Well-Known Member

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    Is it bad idea to modiffy /etc/cron.daily/mlocate.cron

    and add ionice *** before line "/usr/bin/updatedb -f "$nodevs""?
    or better solution is any of the ones mentioned by Michael in previous post?
     
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    #9 postcd, Aug 29, 2014
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