# [OmniOS-discuss] Zpool export while resilvering?

Richard Elling richard.elling at richardelling.com
Tue Jun 9 19:16:31 UTC 2015

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    > On Jun 9, 2015, at 12:00 PM, Narayan Desai <narayan.desai at 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-oo at pooserville.com <mailto:dave-oo at 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
    >
    >
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