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!

High iowait

Discussion in 'General Discussion' started by netlook, Nov 24, 2004.

  1. netlook

    netlook Well-Known Member
    PartnerNOC

    Joined:
    Mar 25, 2004
    Messages:
    335
    Likes Received:
    0
    Trophy Points:
    166
    What may cause very high iowait on RHE PIV 2,8HT box?

    Can you give me some tips to reduce this iowait?
    I have 2 more servers, and the load between all my servers is simillar, but I don't have iowait problems on those two, olny on HT machine.

    Please advice.
     
    #1 netlook, Nov 24, 2004
  2. chirpy

    chirpy Well-Known Member

    Joined:
    Jun 15, 2002
    Messages:
    13,470
    Likes Received:
    21
    Trophy Points:
    463
    Location:
    Go on, have a guess
    What kernel are you running?

    uname -a

    Older RHE kernels were known to have IOWAIT issues, but the recent ones have been fixed.

    A temporary measure is to run the following and place the commands in your /etc/rc.d/rc.local so they're run again after a reboot:

    echo 100 > /proc/sys/vm/inactive_clean_percent
    echo 2 10 20 > /proc/sys/vm/pagecache
     
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...
    #2 chirpy, Nov 24, 2004
  3. netlook

    netlook Well-Known Member
    PartnerNOC

    Joined:
    Mar 25, 2004
    Messages:
    335
    Likes Received:
    0
    Trophy Points:
    166
    2.4.21-15.0.4.ELsmp from ServerMatrix/ThePlanet
     
    #3 netlook, Nov 24, 2004
  4. chirpy

    chirpy Well-Known Member

    Joined:
    Jun 15, 2002
    Messages:
    13,470
    Likes Received:
    21
    Trophy Points:
    463
    Location:
    Go on, have a guess
    Hi,

    That's an old kernel and you should update it. It's known to have the IOWAIT problem. The commands I posted above will help with it, though.
     
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...
    #4 chirpy, Nov 24, 2004
  5. challii

    challii Well-Known Member

    Joined:
    Feb 3, 2004
    Messages:
    98
    Likes Received:
    0
    Trophy Points:
    156
    anyway to easily upgrade to a new version as servermatrix seem adamanent that that version has no problems at all.

    Seems strange how when we bugged them enough they upgraded us to 2.6 on our last server and server was really stable after that.
     
    #5 challii, Nov 24, 2004
  6. netlook

    netlook Well-Known Member
    PartnerNOC

    Joined:
    Mar 25, 2004
    Messages:
    335
    Likes Received:
    0
    Trophy Points:
    166
    So, you think it should be updated to 2.6? Which 2.6 would be OK for my box (2,8PIV HT, 2GB RAM)?

    Thank you
     
    #6 netlook, Nov 25, 2004
  7. koke

    koke Registered
    PartnerNOC

    Joined:
    Nov 14, 2004
    Messages:
    1
    Likes Received:
    0
    Trophy Points:
    151
    #7 koke, Nov 25, 2004
  8. chirpy

    chirpy Well-Known Member

    Joined:
    Jun 15, 2002
    Messages:
    13,470
    Likes Received:
    21
    Trophy Points:
    463
    Location:
    Go on, have a guess
    There's no need to go to the 2.6 kernel (and that only introduces other problems WRT keeping that up to date). The latest RHE kernel is 2.4.21-20.EL and the IOWAIT issues are resolved in that. You can install it using up2date.
     
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...
    #8 chirpy, Nov 25, 2004
(You must log in or sign up to post here.)
Loading...
Similar Threads - High iowait
  1. maxmizban

    kswapd0 high cpu

    maxmizban, Jun 16, 2018 at 9:27 PM, in forum: General Discussion
    Replies:
    1
    Views:
    54
    cPanelMichael
    Jun 18, 2018 at 1:57 PM
  2. oreo240

    MySQL processes using high memory

    oreo240, Jun 12, 2018 at 2:01 AM, in forum: Database Discussion
    Replies:
    3
    Views:
    66
    cPanelLauren
    Jun 13, 2018 at 7:52 AM
  3. Chirag Aggarwal

    High Physical memory usage even at no traffic

    Chirag Aggarwal, May 31, 2018, in forum: General Discussion
    Replies:
    9
    Views:
    155
    cPanelMichael
    Jun 1, 2018
  4. cPanelResources

    Tutorial Troubleshooting high server loads on Linux servers

    cPanelResources, May 8, 2018, in forum: Workarounds and Optimization
    Replies:
    0
    Views:
    118
    cPanelResources
    May 8, 2018
  5. Gareth-AWD

    Remote MySQL latency very high

    Gareth-AWD, Apr 24, 2018, in forum: Database Discussion
    Replies:
    3
    Views:
    107
    cPanelMichael
    Apr 25, 2018

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.
    Accept Learn More...
    Dismiss Notice