Bill Sommerfeld wrote: > On Wed, 2007-09-05 at 14:26 -0700, Richard Elling wrote: > >> AFAIK, nobody has characterized resilvering, though this is about the 4th >> time this week someone has brought the topic up. Has anyone done work here >> that we don't know about? If so, please speak up :-) >> > > I haven't been conducting controlled experiments, but I have been moving > a large pool around recently via a series of zpool replace operations, > and so have been keeping an eye on a bunch of resilvering. > > The one conclusion I have so far is that, for the pool I'm moving, the > time to complete a disk-replacement resilver seems to be largely > independent of the number of disks being resilvered (so far, I've done > batches of up to seven replacements) and in the same ballpark as a > scrub. > > To be conservative, I'm moving only one disk per raidz group per > "pass". > > - Bill > Thanks Bill, I've put together some tests and thus far the bottleneck is on the read side. It may take another week or so to finish my characterizations and analyze the data, though. -- richard
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