Date: Tue, 7 Jul 2009 15:26:31 -0700 From: "Mahlon E. Smith" <mahlon@martini.nu> To: Freddie Cash <fjwcash@gmail.com> Cc: freebsd-stable@freebsd.org Subject: Re: ZFS: drive replacement performance Message-ID: <20090707222631.GA70750@martini.nu> In-Reply-To: <b269bc570907071354r36015689ha362ba83413efc46@mail.gmail.com> References: <20090707195614.GA24326@martini.nu> <b269bc570907071354r36015689ha362ba83413efc46@mail.gmail.com>
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On Tue, Jul 07, 2009, Freddie Cash wrote:
>=20
> This is why we've started using glabel(8) to label our drives, and then a=
dd
> the labels to the pool:
> # zpool create store raidz1 label/disk01 label/disk02 label/disk03
>=20
> That way, it does matter where the kernel detects the drives or what the
> physical device node is called, GEOM picks up the label, and ZFS uses the
> label.
Ah, slick. I'll definitely be doing that moving forward. Wonder if I
could do it piecemeal now via a shell game, labeling and replacing each
individual drive? Will put that on my "try it" list.
> > Once I swapped drives, I issued a 'zpool replace'.
> >
>=20
> See comment at the end: what's the replace command that you used?
After the reboot that shuffled device order, the 'da2' changed to that
ID number. To have it accept the replace command, I had to use the
number itself -- I couldn't use 'da2' since that was now elsewhere, in
use, on the raidz1. Surprisingly, it worked. Or at least, it appeared
to.
% zpool replace store 2025342973333799752 da8
> There's something wrong here. It definitely should be incrementing. Even
> when we did the foolish thing of creating a 24-drive raidz2 vdev and had =
to
> replace a drive, the progress bar did change. Never got above 39% as it
> kept restarting, but it did increment.
Strangely, the ETA is jumping all over the place, from 50 hours to 2000+
hours. Never seen the percent complete over 0.01% done, but then it
goes back to 0.00%.
> I'd redo the replace command, and check the output of "zpool status"
> to make sure it's showing the proper device node and not some random
> string of numbers like it is.
Hmm, I'm hunting for it but I don't see it -- know of any way to stop a
replace in progress?
Thanks for the quick reply, Freddie!
--
Mahlon E. Smith =20
http://www.martini.nu/contact.html
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