[Linux-cluster] multiple gfs2_tool shrinks cause hang?

Scooter Morris scooter at cgl.ucsf.edu
Wed Feb 23 20:17:00 UTC 2011

Hi all,
     I recently had a hang on our cluster that I unwittingly caused and 
wondered if anyone else has seen anything similar.  We were noticing a 
definitely slow-down in one filesystem and doing some investigation, I 
noticed that one of the nodes had a large number of locks gfs2_glock in 
/proc/slabinfo was very large.  I decided to try doing a gfs2_tool 
shrink on the filesystem that was going to slow.  I noticed some 
reduction in the number of locks, but not a lot, so I did it again.  
Everything dropped into D wait on that filesystem, as did several of the 
kernel threads.  Has anyone else seen this behavior?  Is this a known bug?

-- scooter

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