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7.4

Linux freezing problems on IBM HS20

Asked by PsiCop in Linux, Linux Distributions

Tags: linux, hs20, ibm, freezing

I'm having some very wierd performance issues on an IBM HS20 blade, and it's left me perplexed. I'm hoping someone else may have some ideas.

The blade has dual 2GHz dual-core CPUs and 2 GB of RAM. Boots fine. Has local disk and also QLogic NICs to SAN storage. The OS and swap are all local (some Oracle stuff is on the SAN).

The OS is RHEL v3.0.5. Default run level is 3 (no X).

While running, the system will mysteriously "freeze". This occurs roughly every 15-20 seconds, and lasts about 40-to-50 seconds. If I didn't know better, I'd think it was running Winblows ME.

I've tried running top to isolate the process hogging the CPU. No luck. Even going in as root and running "top -q" doesn't prevent the "freeze" from stopping top in its tracks.

The best I've been able to ferret out with top is that, when the freeze happens, the only non-idle process (aside from top) is kjournald. When observing the system through top, it freezes with kjournald shown in an Uninterruptable Sleep state. I'm not sure how significant that is.

I stripped the system down to a very vanilla Run Level 3 (disabled all Oracle-related processes). No change.

I switched to Run Level 1 (telinit 1) and the issue persists.

This is only one of many IBM HS20 blades of similar configuration we have running this flavor of Linux. As far as I'm aware, its the only one experiencing this issue.

Does anyone have any idea on what the root cause might be? Does anyone have any troubleshooting ideas I haven't mentioned?
[+][-]01/26/07 07:59 AM, ID: 18405022Author Comment

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[+][-]01/26/07 04:26 PM, ID: 18408461Expert Comment

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[+][-]01/26/07 04:27 PM, ID: 18408467Accepted Solution

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About this solution

Zones: Linux, Linux Distributions
Tags: linux, hs20, ibm, freezing
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Solution Provided By: duncan_roe
Participating Experts: 2
Solution Grade: B
 
[+][-]01/26/07 08:55 PM, ID: 18409031Author Comment

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[+][-]01/27/07 12:45 AM, ID: 18409450Expert Comment

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[+][-]01/27/07 06:19 AM, ID: 18410085Author Comment

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[+][-]01/27/07 07:16 AM, ID: 18410254Assisted Solution

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[+][-]01/29/07 10:49 AM, ID: 18421782Author Comment

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[+][-]01/31/07 01:40 PM, ID: 18439927Author Comment

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[+][-]02/05/07 05:51 PM, ID: 18472944Author Comment

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[+][-]02/15/07 08:43 AM, ID: 18541603Author Comment

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[+][-]02/15/07 09:04 AM, ID: 18541826Expert Comment

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