Date: Thu, 27 Aug 2009 13:18:06 +0400 From: "Mikhail (Plus Plus)" <m@plus-plus.su> To: freebsd-fs@freebsd.org Subject: Re: need help with ZFS Message-ID: <4A964F4E.4080009@plus-plus.su> In-Reply-To: <4A927CB3.3040402@plus-plus.su> References: <4A927CB3.3040402@plus-plus.su>
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Last night I installed FreeBSD-8.0BETA3 AMD64, upgraded zpool and zfs, and this morning I did some load on FS to see if it runs more stable now. To stress-load the system I ran rsync from ZFS to mounted UFS volume and at the same time I started bonie++ benchmark on ZFS volume: bonnie++ -s17000 -d. -n64 Everything worked fine for about ~90 minutes, but then system paniced. I got escaped to "db> " prompt on local console, but I have zero debugging experience, so I just rebooted the server. The only thing I noticed was that last mentioned PID on the panic screen was bonnie++'s process. Also, I'm very confused after re-reading ZFS tuning wiki from here: http://wiki.freebsd.org/ZFSTuningGuide "amd64 FreeBSD 7.2+ has improved kernel memory allocation strategy and no tuning may be necessary on systems with more than 2 GB of RAM." Does that mean I no longer have to tune ZFS via loader.conf? Just better leave it empty on FreeBSD-8.0 installation? Right now I'm going to continue with rsync and will start bonnie++ in parallel keeping my loader.conf with the following values: vm.kmem_size="1536M" vm.kmem_size_max="3072M" vm.pmap.shpgperproc="1024" vfs.zfs.arc_min="256M" vfs.zfs.arc_max="384M" vfs.zfs.vdev.cache.size="50M" vfs.zfs.prefetch_disable="1" kern.maxproc="20000" I would appreciate any tips on showing me how to debug system panic from "db> " prompt in case system panics again.. Thank you.
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