Jeff, this sounds like the notorious array cache flushing issue. See http://www.solarisinternals.com/wiki/index.php/ZFS_Evil_Tuning_Guide#Cache_Flushes -- richard
Jeff Meidinger wrote: > Hello, > > I received the following question from a company I am working with: > > We are having issues with our early experiments with ZFS with volumes > mounted from a 6130. > > Here is what we have and what we are seeing: > > T2000 (geronimo) on the fibre with a 6130. > 6130 configured with UFS volumes mapped and mounted on several other > hosts. > it's the only host using ZFS volume (only one volume/filesystem > configured). > > When I attempt to load the volume from backup, we see memory being > consumed at a > very high rate on the host with the ZFS filesystem mounted and it > seems that disk > latencies all hosts connected through the fibre to the 6130 increase > to the point > where performance problems are noted. > > Our monitoring system eventually got blocked, I assume, due to > resource starvation; either the machine was thrashing or waiting for > I/O. Before the system hung, I looked at memory allocation using kdb > and saw anonymous allocations responsible for far and away the biggest > chunk. Also, when the backup is suspended the memory is not freed. > Eventually, the server hung and rebooted (perhaps due to Oracle > cluster-health mechanism - I won't blame ZFS for that ;-). > > I suspect a ZFS caching issue. I was directed to this doc > (http://blogs.digitar.com/jjww/?itemid=44) . It sort of addresses the > issue we have encountered but I'd rather get the news from you guys. > > How shall I proceed? I have a system I can use and abuse in > preproduction for this purpose. We need to load a Terabyte into a > production ZFS filesystem without pulling down everyone on the fibre... > > > > Please respond to me directly as well as to the alias as I am not > added yet. > > Thanks, > Jeff > ------------------------------------------------------------------------ > > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss > _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
