On Thu, Oct 18, 2012 at 8:45 PM, Ski Kacoroski <[email protected]> wrote:
> Hi, > > I am trying to debug a problem with our backup software where the > processes quit for no apparent reason. As part of the process I set up SAR > to run every 2 minutes. What is very strange is that SAR also drops out > and then reappears. So, for example. I will have SAR readings every two > minutes up till 7:24pm. Then nothing until 7:36pm where it resumes taking > readings every 2 minutes. The backup processes all die at 7:26pm. This > pattern has happened several times (different times and 'black out' periods > though. Nothing in the logs that I can see. Any idea why SAR would stop > taking readings and then start again? > Because the same thing that's killing your backup is also killing SAR? I'd be suspicious of IO or swap issues... I've seen things like this when a SCSI bus get's reset or the like. Could also be very high load due to swapping, etc., but I'd first look at disk issues... sounds like maybe you can't write for a minute and SAR just gives up. Check dmesg? Nick
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