Date: Sun, 4 Nov 2007 14:23:54 +0000 From: Thomas Sparrevohn <Thomas.Sparrevohn@btinternet.com> To: freebsd-current@freebsd.org Cc: Peter Schuller <peter.schuller@infidyne.com> Subject: Re: ZFS Hangs Message-ID: <200711041423.54336.Thomas.Sparrevohn@btinternet.com> In-Reply-To: <200711041302.08877.peter.schuller@infidyne.com> References: <200711021208.25913.Thomas.Sparrevohn@btinternet.com> <472D9B2A.5080900@FreeBSD.org> <200711041302.08877.peter.schuller@infidyne.com>
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On Sunday 04 November 2007 12:02:08 Peter Schuller wrote: > > 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?) > Hmm. I seeing the hang now - but had not been seeing it before as I had increased the arc cache size - seems a very low arc_max - its about 300MB on a 4GB amd64 system However ZFS haning in "zfs:(&zio_cv_io)" is new - I have been running this system using ZFS for month without any trouble - The only change I can think of is that the devices has been changes to ATA RAID 0+1 apart from that everything worked before the 28/10-2007 - that when I installed the extra disks to change from RAID 0 - to RAID 0+1 -
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