On Sep 20, 2011 8:38 AM, "Edward Ned Harvey" <lop...@nedharvey.com> wrote:
> > As for mirroring the ZIL: Distrust for a single drive has some truth in it. > If you have a disk failure (including data error) on your unmirrored ZIL > device, which coincides with a system ungraceful crash, then the data on > that device would be lost. The assumption, if you don't mirror your ZIL, is > that the probability of these multiple failures coinciding is small enough > to be comparable to the probability of multiple disk failures coinciding. > > It used to be that if you didn't mirror the ZIL and had it go bad that you had a major failure condition and you would have to recreate the spool from scratch. Granted, this was a pretty silly limitation and was fixed in 2010. Now, if you lose the zip it will fail back to the spool disks. Still, since I'm already mirroring the OS, I get ZIL mirroring essentially free. The ZIL is only used for writing unless there is a crash.
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