ZFS Hangs

Peter Schuller peter.schuller at infidyne.com
Sun Nov 4 04:08:21 PST 2007


> It certainly could be a caching effect but the particular problem you
> were seeing should have been fixed.  Are you still seeing it?

I am not still seeing it; the machine has since been switched to AMD 64, and 
RAM increased from 1 GB to 3 GB (and FreeBSD itself upgraded several times 
since then). I did not look into it in terrible detail; I just observed by 
tracing that the I/O in question was definitely the package database, and 
that it was definitely accessing the same files mutiple times. I assumed it 
was a caching effect at the time, given all the maxvnode tweaking and sizing 
restrictions put on the ARC. I do know I never saw it after the memory 
increase.

Also, this might have been prior to disabling prefetch. If it was, perhaps the 
prefetch hosed the cache. (Are the prefetch issues still there, anyone?)

-- 
/ Peter Schuller

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