The Community Forums

Interact with an entire community of cPanel & WHM users!
  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

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:
    13,472
    Likes Received:
    20
    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
     
    #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:
    13,472
    Likes Received:
    20
    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.
     
    #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:
    13,472
    Likes Received:
    20
    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.
     
    #8 chirpy, Nov 25, 2004
(You must log in or sign up to post here.)
Loading...
Similar Threads - High iowait
  1. yu0307

    Site very slow, High TTFB, what happened?

    yu0307, Aug 11, 2017, in forum: Workarounds and Optimization
    Replies:
    3
    Views:
    76
    cPanelMichael
    Aug 14, 2017 at 10:46 AM
  2. Monto

    Backup causing high loads

    Monto, Jul 22, 2017, in forum: General Discussion
    Replies:
    2
    Views:
    111
    Monto
    Jul 24, 2017
  3. theallan

    pigz / pkgacct high cpu

    theallan, Jul 13, 2017, in forum: Data Protection
    Replies:
    1
    Views:
    144
    cPanelMichael
    Jul 13, 2017
  4. divemasterza

    p0f running high cpu (close to 100%)

    divemasterza, Jul 5, 2017, in forum: General Discussion
    Replies:
    3
    Views:
    101
    cPanelMichael
    Jul 5, 2017
  5. nirbhay712

    High Memory usage on New VPS

    nirbhay712, Jun 25, 2017, in forum: General Discussion
    Replies:
    4
    Views:
    138
    cPanelMichael
    Jun 26, 2017

Share This Page