panic in ffs (Re: hangs in nbufkv)
dillon at apollo.backplane.com
Tue Oct 12 11:18:18 PDT 2004
:> But to be absolutely safe, I would follow Bruce's original suggestion
:> and increase BKVASIZE to 64K, for your particular system.
:After doing this and testing our backup script, the machine panicked two
:hours later (about half-way through the backup) with
:"initiate_write_inodeblock_ufs2: already started" (in
:ufs/ffs/ffs_softdep.c)... I guess, block sizes above 16Kb are just buggy
:and newfs(8) should be honest about it...
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.
I think the buffer cache itself is is likely not the source of this
<dillon at backplane.com>
More information about the freebsd-current