Please whitelist cPanel in your adblocker so that you’re able to see our version release promotions, thanks!

The Community Forums

Interact with an entire community of cPanel & WHM users!

How to prevent high disk I/O?

Discussion in 'General Discussion' started by thewebhosting, Jul 17, 2009.

  1. thewebhosting

    thewebhosting Well-Known Member

    Joined:
    May 9, 2008
    Messages:
    1,201
    Likes Received:
    1
    Trophy Points:
    68
    I found high disk I/O when i use iostat -xtc command.

    Can anyone let me know what steps I need to follow in order to prevent this high I/O?

    Thanks!
     
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...
  2. serversignature

    serversignature Well-Known Member

    Joined:
    Nov 26, 2007
    Messages:
    107
    Likes Received:
    0
    Trophy Points:
    66
    Location:
    Bangalore
    can you post the output of the following command below during your system's peak workload period.

    iostat 5 3 > io.out
     
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...
  3. eth00

    eth00 Well-Known Member
    PartnerNOC

    Joined:
    Mar 30, 2003
    Messages:
    723
    Likes Received:
    1
    Trophy Points:
    168
    Location:
    NC
    cPanel Access Level:
    Root Administrator
    Well the disk IO is the transfer, so stop the transfer and disk io drops ;)

    You could try noatime

    Are you swapping? That can kill the disk (IO wise)

    The below are not to lower it but divert and hopefully speed the machine up:

    Busy SQL server? Move SQL to another drive

    Move home to another drive perhaps?

    You could go RAID

    Really a lot of things you can do to help out, mor then just this.
     
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...
  4. chirpy

    chirpy Well-Known Member

    Joined:
    Jun 15, 2002
    Messages:
    13,460
    Likes Received:
    21
    Trophy Points:
    463
    Location:
    Go on, have a guess
    In addition to John's suggestions, you should probably check that you don't have actual disk IO subsystem problems by checking the disks read stats:

    hdparm -tT /dev/sda

    Where /dev/sda is the disk to check (check each of them). I've certainly seen it where there have been BIOS or build issues (or just slow disks) causing excessive IOWAIT.
     
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...
Loading...

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice