[WBEL-users] Investigating a kernel panic

[Mark Reynolds]

I had high load issues, on wbel 3, running squid, and
these memory 'tweeking' adjustments solved them.
Just mentioning them, as you speak of memory issues.
Also, I found the issue occured gradually over time.
Am hoping wbel 4 makes these 'tweeks' redundant.
-- 
Mark Reynolds  

      
#!/bin/bash
  
# http://www.sonarnerd.net/projects/linux/
 
# riel suggested these ...
echo 2 10 20 > /proc/sys/vm/pagecache
echo 100 > /proc/sys/vm/inactive_clean_percent
 




Quoting Simone <simone72 at email.it>:

> Thanks for all the replies. I performed a smartctl -a test and it looks 
> ok, despite /dev/sda is 59°C pretty close to the Drive Trip Temperature 
> 60 °C.
> hdparm results:
> 
>  Device: HP       18.2GB A 80-S1A0 Version: S1A0
> /dev/sda:  
>  Timing buffer-cache reads:   428 MB in  2.00 seconds = 214.00 MB/sec
>  Timing buffered disk reads:   78 MB in  3.00 seconds =  26.00 MB/sec
> Device: COMPAQ   BD0186349B       Version: 3B05
> /dev/sdb:
>  Timing buffer-cache reads:   428 MB in  2.00 seconds = 214.00 MB/sec
>  Timing buffered disk reads:   66 MB in  3.07 seconds =  21.50 MB/sec
> 
> Looks pretty the same to me.
>  I am somehow thinking of a memory related problem, but I have some 
> questions. The previous install was on a pentium III 866Mhz 768Mb PC100 
> ram 2x 10Gb ATA66 Disks RAID1, and it crashed every 20 days more or less 
> (it happened also 2 times in 2 days). This install is on a Celeron 
> 1300Mhz, 512 Mb PC133 Ram Computer, 2x 18Gb SCSI RAID1, and it has 
> crashed after 30 days. Power supply is different as well as the entire 
> case/motherboard and whatever you can imagine (know it is not really 
> server hardware, but it's what they gave me, and I won't give up on 
> having Linux present in the company). It's 2 completely different 
> machines, but the issue is the same, so maybe I'm wrong, but I would 
> exclude the power supply or disks or mobo. 
> I thought of the memory like  Brian suggested, considering that under a 
> high load it could heavily swap leading to the panic, even though top 
> doesn't show such a heavy memory usage or swapping during normal operation.
> 
> Is there a way to get more info on the machine state just previous to 
> the panic?
> 
> Thanks for all your help
> Simone
> 
> 
> 
> 
> Sudev Barar wrote:
> 
> >On Tue, 2005-04-12 at 11:38 +0200, Simone wrote:
> >  
> >
> >>Hi list,
> >>I periodically experience kernel panics on my wbel3 box. This server is 
> >>running as a front end mail filter for exchange, with a typical 
> >>MailScanner - sendmail - clamav setup. I also have mailwatch for 
> >>mailscanner running, which is a LAMP kind setup. Every 3-4 weeks I have 
> >>a crash, with keyboard blinking lights, and I don't understand the 
> >>reason for it. Recently installed a new server same configuration, 2 x 
> >>18Gb scsi disks raid1, thinking it was possibly a hardware problem, but 
> >>this morning after a month running fine, I had the first crash. Could 
> >>you please tell me where to look for possible indications on what could 
> >>have caused the panic? Checked log/messages but it looks like no useful 
> >>info is in there.
> >>    
> >>
> >
> >We faced a similar behaviour on server running RH9. Two changes were
> >done and till date I do not know for certain if any were responsible.
> >1. Upgraded the power supply with higher wattage.
> >2. Changed the drive cables as on of the drives was giving slow results
> >when checked with #hdparm -tT /dev/sd[ac]
> >HTH
> >
> >  
> >
> 
> 


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