[CentOS] bizarre system slowness

Wed Apr 13 20:16:36 UTC 2011
Brunner, Brian T. <BBrunner at gai-tronics.com>

centos-bounces at centos.org wrote:
> Running v5 64bit on a Dell 1950.
> A cluster of 3 DB machines, identical hardware. One of them suddenly
> became slower 2 weeks ago. 

<snip proof the overall system is slow>

<snip proof that the CPU is not the problem>

> /var/log/messages was full of "ntpd[7313]: frequency error -1707 PPM
> exceeds tolerance 500 PPM" messages. 

Sounds like your CMOS time-keeping chip may be dying.

> I'm still kind of hoping it's a software issue, but chances are slim.
> OTOH, I can't imagine any hardware problem that would exhibit these
> symptoms. 
> Any idea what to test?

Any RAID setups go into self-repair mode?

dd if=/dev/($nextdrive)1 of=/dev/null count=100000 (just compare just
the read speeds off each spindle)
for each disk on each system.  
ONE drive slower then the other blames the drive or the data thereon
(RAID rebuild).  
ALL drives on the slow system blames the mobo.

smartctl -t on each of the disks then smartctl -a

Are these system busy serving customers, or can they be opened and drive
sets swapped between systems?

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