[rhn-users] Longer I/O waits in RHEL3

Sullivan, Michael michael.sullivan at eds.com
Mon Aug 15 23:55:16 UTC 2005


Hello Mike, voyager dc; 

You might pull some sar() stats and match them up to your top output to
verify if your getting correct statistics.  The rpm package is
downloadable from RHN--sysstat.  Also, Check out this bugzilla regarding
high iowait:

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=130357

--Mike. 

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-----Original Message-----
From: rhn-users-bounces at redhat.com [mailto:rhn-users-bounces at redhat.com]
On Behalf Of Mike Dross
Sent: Monday, August 15, 2005 4:05 PM
To: Red Hat Network Users List
Subject: RE: [rhn-users] Longer I/O waits in RHEL3


I am seeing the same problem on a Dual 3GHZ RHEL3 box with IO waits in
the 90% range with nothing running. Is there a problem with top or is
there really that much of an I/O bottle neck. It's a SCSI 320 system.


Mike

-----Original Message-----
From: rhn-users-bounces at redhat.com
[mailto:rhn-users-bounces at redhat.com]On Behalf Of voyager dc
Sent: Monday, August 15, 2005 3:34 PM
To: rhn-users at redhat.com
Subject: [rhn-users] Longer I/O waits in RHEL3


Hi,

I have RHEL3 running with kernel version - 2.4.21-4.ELsmp. And I have
2GB RAM.  When I do a 'top' the I/O waits are always at 70-90%, is there
a way I could actually tweak this to have lower I/O waits. Below are the
stats from top

 15:13:44  up 5 days, 21:53,  3 users,  load average: 2.32, 2.83, 2.97
98 processes: 95 sleeping, 1 running, 0 zombie, 2 stopped
CPU states:  cpu    user    nice  system    irq  softirq  iowait    idle
           total    2.8%    0.0%    1.2%   0.4%     0.8%   91.0%    3.7%
           cpu00    3.2%    0.0%    0.2%   0.0%     0.0%   93.0%    3.6%
           cpu01    3.0%    0.0%    1.0%   1.6%     2.0%   89.4%    3.0%
           cpu02    1.4%    0.0%    2.8%   0.0%     1.2%   90.6%    4.0%
           cpu03    3.8%    0.0%    0.8%   0.0%     0.0%   91.0%    4.4%
Mem:  2060212k av, 2022960k used,   37252k free,       0k shrd,    3368k
buff
                   1570164k actv,  195200k in_d,   26840k in_c
Swap:  522072k av,       0k used,  522072k free                 1109840k
cached.

Thanks

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