<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Jun 9, 2015, at 12:00 PM, Narayan Desai <<a href="mailto:narayan.desai@gmail.com" class="">narayan.desai@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">You might also crank up the priority on your resilver, particularly if it is getting tripped all of the time:<div class=""><a href="http://broken.net/uncategorized/zfs-performance-tuning-for-scrubs-and-resilvers/" class="">http://broken.net/uncategorized/zfs-performance-tuning-for-scrubs-and-resilvers/</a><br class=""></div><div class=""> -nld</div></div></div></blockquote><div><br class=""></div><div>In general, yes this is a very good post. However, for more recent ZFS and certainly</div><div>the lastest OmniOS something-14 release, the write throttle has been completely</div><div>rewritten, positively impacting resilvers. And, with that rewrite, there is a few more</div><div>tunables at your disposal, while the old ones fade to the bucket of bad memories :-)</div><div><br class=""></div><div>In most cases, resilver is capped by the time to write to the resilvering device.</div><div>You can see this in iostat "-x" as the device that is 100% busy with write workload.</div><div>That said, for this specific case, the drives are not actually failed, just taken offline,</div><div>so you could have a short resilver session, once they are brought back online.</div><div> -- richard</div><br class=""><blockquote type="cite" class=""><div class=""><div class="gmail_extra"><br class=""><div class="gmail_quote">On Tue, Jun 9, 2015 at 1:31 PM, Dave Pooser <span dir="ltr" class=""><<a href="mailto:dave-oo@pooserville.com" target="_blank" class="">dave-oo@pooserville.com</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="HOEnZb"><div class="h5">>This is probably a silly question, but I¹ve honestly never tried this and<br class="">
>don¹t have a test machine handy at the moment can a pool be safely<br class="">
>exported and re-imported later if it is currently resilvering?<br class="">
><br class="">
>In the way of a bit of background, I have a pool made up with thirty or<br class="">
>so 4TB Seagate disks with a firmware issue that results in their max temp<br class="">
>being set at 40C as opposed to 60C. This particular pool is<br class="">
> in an office building in Texas, in an air-conditioned server room. The<br class="">
>condenser for this unit is in the building¹s plenum and when the building<br class="">
>a/c goes off over weekends in the summer my server room a/c struggles and<br class="">
>temps run up to about 85F or so. This<br class="">
> is causing my pool to drop random disks lately (fmadm reports high temp<br class="">
>and they get marked as removed from the pool), and I¹ve only just<br class="">
>narrowed it down to this firmware issue. Seagate firmware update utility<br class="">
>is apparently Windows only, so the disks must<br class="">
> come out for the firmware update, but the pool is resilvering several<br class="">
>disks with days remaining, hence my original query.<br class="">
<br class="">
</div></div>Not an answer to your question, but the approach I'd take is renting a<br class="">
portable 110V or 220V A/C unit from somebody like <a href="http://spot-coolers.com/" target="_blank" class="">spot-coolers.com</a> to get<br class="">
you through the resilver, then apply the firmware update. (And then I'd<br class="">
start trying to convince management that it's worth adding a unit<br class="">
permanently -- our Office Pro 24 24000BTU/hr cost us under $4k back in<br class="">
2011.)<br class="">
<span class="HOEnZb"><font color="#888888" class="">--<br class="">
Dave Pooser<br class="">
Cat-Herder-in-Chief, <a href="http://Pooserville.com" class="">Pooserville.com</a><br class="">
<br class="">
<br class="">
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