panic in ffs (Re: hangs in nbufkv)
Mikhail.Teterin at murex.com
Tue Oct 12 20:43:19 PDT 2004
Matthew Dillon wrote:
> Well, it's possible that UFS has bugs related to large block sizes.
> People have gotten bitten on and off over the years but usually it
> works ok if you leave the 8:1 blocksize:fragsize ratio intact. e.g.
> if you have a 64KB block size then you should use a 8K frag size.
> If you have a 32KB block size then you should use a 4K frag size.
This is the case here: fs_bsize 65536, fs_fsize 8192.
> I think the buffer cache itself is is likely not the source of this
> particular bug.
I don't know, how, but the bug seems triggered by upping the
net.inet.udp.maxdgram from 9216 (default) to 16384 (to match the NFS
client's wsize). Once I do that, the machine will either panic or just
hang a few minutes into the heavy NFS writing (Sybase database dumps
from a Solaris server). Happened twice already...
P.S. Thanks for prompt responses and advice, BTW!
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