Re: Blocket for more than 120 seconds

[Chris Mason <clm@fb.com>]

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On Sun, 2013-12-15 at 03:35 +0100, Hans-Kristian Bakke wrote:
> I have done some more testing. I turned off everything using the disk
> and only did defrag. I have created a script that gives me a list of
> the files with the most extents. I started from the top to improve the
> fragmentation of the worst files. The most fragmentet file was a file
> of about 32GB with over 250 000 extents!
> It seems that I can defrag a two to three largish (15-30GB) ~100 000
> extents files just fine, but after a while the system locks up (not a
> complete hard lock, but everythings hangs and a restart is necessary
> to get a fully working system again)
> 
> It seems like defrag operations is triggering the issue. Probably in
> combination with the large and heavily fragmentet files.
> 

I'm trying to understand how defrag factors into your backup workload?
Do you have autodefrag on, or are you running a defrag as part of the
backup when you see these stalls?

If not, we're seeing a different problem.

-chris

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