> On Jun 9, 2015, at 12:00 PM, Narayan Desai <narayan.de...@gmail.com> wrote: > > You might also crank up the priority on your resilver, particularly if it is > getting tripped all of the time: > http://broken.net/uncategorized/zfs-performance-tuning-for-scrubs-and-resilvers/ > > <http://broken.net/uncategorized/zfs-performance-tuning-for-scrubs-and-resilvers/> > -nld
In general, yes this is a very good post. However, for more recent ZFS and certainly the lastest OmniOS something-14 release, the write throttle has been completely rewritten, positively impacting resilvers. And, with that rewrite, there is a few more tunables at your disposal, while the old ones fade to the bucket of bad memories :-) In most cases, resilver is capped by the time to write to the resilvering device. You can see this in iostat "-x" as the device that is 100% busy with write workload. That said, for this specific case, the drives are not actually failed, just taken offline, so you could have a short resilver session, once they are brought back online. -- richard > > On Tue, Jun 9, 2015 at 1:31 PM, Dave Pooser <dave...@pooserville.com > <mailto:dave...@pooserville.com>> wrote: > >This is probably a silly question, but I¹ve honestly never tried this and > >don¹t have a test machine handy at the moment can a pool be safely > >exported and re-imported later if it is currently resilvering? > > > >In the way of a bit of background, I have a pool made up with thirty or > >so 4TB Seagate disks with a firmware issue that results in their max temp > >being set at 40C as opposed to 60C. This particular pool is > > in an office building in Texas, in an air-conditioned server room. The > >condenser for this unit is in the building¹s plenum and when the building > >a/c goes off over weekends in the summer my server room a/c struggles and > >temps run up to about 85F or so. This > > is causing my pool to drop random disks lately (fmadm reports high temp > >and they get marked as removed from the pool), and I¹ve only just > >narrowed it down to this firmware issue. Seagate firmware update utility > >is apparently Windows only, so the disks must > > come out for the firmware update, but the pool is resilvering several > >disks with days remaining, hence my original query. > > Not an answer to your question, but the approach I'd take is renting a > portable 110V or 220V A/C unit from somebody like spot-coolers.com > <http://spot-coolers.com/> to get > you through the resilver, then apply the firmware update. (And then I'd > start trying to convince management that it's worth adding a unit > permanently -- our Office Pro 24 24000BTU/hr cost us under $4k back in > 2011.) > -- > Dave Pooser > Cat-Herder-in-Chief, Pooserville.com > > > _______________________________________________ > OmniOS-discuss mailing list > OmniOS-discuss@lists.omniti.com <mailto:OmniOS-discuss@lists.omniti.com> > http://lists.omniti.com/mailman/listinfo/omnios-discuss > <http://lists.omniti.com/mailman/listinfo/omnios-discuss> > > _______________________________________________ > OmniOS-discuss mailing list > OmniOS-discuss@lists.omniti.com > http://lists.omniti.com/mailman/listinfo/omnios-discuss
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