On Thu, Nov 12, 2009 at 3:19 PM, Artem Belevich <fbsdlist_at_src.cx> wrote: > > Log seems to be somewhat weak point in ZFS. If you lose your log > device, you will lose your pool. Plus, there's no way to remove log > device from the pool. So, once you attach some device as a log, you'd > better be sure that device does not disappear, because it will take > the rest of the pool with it. From that point, real ram-disk (i.e. > /dev/mdN) is definitely a recipe for disaster. External ramdisk with a > battery backup may be an option, but even in mirrored configuration > seems rather risky to me. > > http://jmlittle.blogspot.com/2008/05/problem-with-slogs-how-i-lost.html > > I'd say that SSD are probably the best fit for slog role. Indeed. I mirrored 2 SSDs on an Areca in case I loose one of them. Partitioned the SSD into a log device and the rest being cache (see the ZFS best practices guide for details). Needless to say my performance matches that of normal writes and reads when using NFS now. ScottReceived on Thu Nov 12 2009 - 20:15:10 UTC
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