[Ocfs2-users] NFS in "D" State

[michael.a.jaquays at verizon.com]

All,

I've seen a few posts about this issue in the past, but not a resolution.  I have a 3 node cluster sharing ocfs2 volumes to app nodes via nfs.  On occasion, one of our db nodes will have nfs go into an uninterruptable sleep state.  The nfs daemon is completely useless at this point.  The db node has to be rebooted to resolve.  It seems that nfs is waiting on ocfs2_wait_for_mask.  Any suggestions on a resolution would be appreciated.

root     18387  0.0  0.0      0     0 ?        S<   Mar15   0:00 [nfsd4]
root     18389  0.0  0.0      0     0 ?        D    Mar15   0:10 [nfsd]
root     18390  0.0  0.0      0     0 ?        D    Mar15   0:10 [nfsd]
root     18391  0.0  0.0      0     0 ?        D    Mar15   0:10 [nfsd]
root     18392  0.0  0.0      0     0 ?        D    Mar15   0:13 [nfsd]
root     18393  0.0  0.0      0     0 ?        D    Mar15   0:08 [nfsd]
root     18394  0.0  0.0      0     0 ?        D    Mar15   0:09 [nfsd]
root     18395  0.0  0.0      0     0 ?        D    Mar15   0:12 [nfsd]
root     18396  0.0  0.0      0     0 ?        D    Mar15   0:13 [nfsd] 

18387 nfsd4           worker_thread
18389 nfsd            ocfs2_wait_for_mask
18390 nfsd            ocfs2_wait_for_mask
18391 nfsd            ocfs2_wait_for_mask
18392 nfsd            ocfs2_wait_for_mask
18393 nfsd            ocfs2_wait_for_mask
18394 nfsd            ocfs2_wait_for_mask
18395 nfsd            ocfs2_wait_for_mask
18396 nfsd            ocfs2_wait_for_mask
 

-Mike Jaquays