Date: Sat, 9 Jan 2010 18:21:27 +0000 From: krad <kraduk@googlemail.com> To: Steve Bertrand <steve@ibctech.ca> Cc: Wes Morgan <morganw@chemikals.org>, "freebsd-questions@freebsd.org Questions -" <freebsd-questions@freebsd.org> Subject: Re: Replacing disks in a ZFS pool Message-ID: <d36406631001091021n39129e2by3be4423523ce5275@mail.gmail.com> In-Reply-To: <4B47739D.1090206@ibctech.ca> References: <4B451FE9.6040501@ibctech.ca> <alpine.BSF.2.00.1001062106200.76339@ibyngvyr> <d36406631001080310p1877ceb4w9753c2e6cac38491@mail.gmail.com> <4B4761E6.3000904@ibctech.ca> <4B47739D.1090206@ibctech.ca>
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2010/1/8 Steve Bertrand <steve@ibctech.ca> > Steve Bertrand wrote: > > krad wrote: > > > >>>> the idea of using this type of label instead of the disk names > >>> themselves. > >>> > >>> I personally haven't run into any bad problems using the full device, > but > >>> I suppose it could be a problem. (Side note - geom should learn how to > >>> parse zfs labels so it could create something like /dev/zfs/<uuid> for > >>> device nodes instead of using other trickery) > >>> > >>>> How should I proceed? I'm assuming something like this: > >>>> > >>>> - add the new 1.5TB drives into the existing, running system > >>>> - GPT label them > >>>> - use 'zpool replace' to replace one drive at a time, allowing the > pool > >>>> to rebuild after each drive is replaced > >>>> - once all four drives are complete, shut down the system, remove the > >>>> four original drives, and connect the four new ones where the old ones > >>> were > >>> > >>> If you have enough ports to bring all eight drives online at once, I > would > >>> recommend using 'zfs send' rather than the replacement. That way you'll > >>> get something like a "burn-in" on your new drives, and I believe it > will > >>> probably be faster than the replacement process. Even on an active > system, > >>> you can use a couple of incremental snapshots and reduce the downtime > to a > >>> bare minimum. > >>> > >>> > >> Surely it would be better to attach the drives either individually or as > a > >> matching vdev (assuming they can all run at once), then break the mirror > >> after its resilvered. Far less work and far less liekly to miss > something. > >> > >> What I have done with my system is label the drives up with a coloured > >> sticker then create a glabel for the device. I then add the glabels to > the > >> zpool. Makes it very easy to identify the drives. > > > > Ok. Unfortunately, the box only has four SATA ports. > > > > Can I: > > > > - shut down > > - replace a single existing drive with a new one (breaking the RAID) > > - boot back up > > - gpt label the new disk > > - import the new gpt labelled disk > > - rebuild array > > - rinse, repeat three more times > > > > This seems to work ok: > > # zpool offline storage ad6 > # halt & replace disk, and start machine > # zpool online storage ad6 > # zpool replace storage ad6 > > I don't know enough about gpt/gpart to be able to work that into the > mix. I would much prefer to have gpt labels as opposed to disk names, > but alas. > > fwiw, can I label an entire disk (such as ad6) with gpt, without having > to install boot blocks etc? > > I was hoping it would be as easy as: > > # gpt create -f ad6 > # gpt label -l disk1 ad6 > > ...but it doesn't work. > > Neither does: > > # gpart create -s gpt ad6 > # gpart add -t freebsd-zfs -l disk1 ad6 > > I'd like to do this so I don't have to manually specify a size to use. I > just want the system to Do The Right Thing, which in this case, would be > to just use the entire disk. > > Steve > > > > > > If so, is there anything I should do prior to the initial drive > > replacement, or will simulating the drive failure be ok? > > > > Steve > > _______________________________________________ > > freebsd-questions@freebsd.org mailing list > > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > > To unsubscribe, send any mail to " > freebsd-questions-unsubscribe@freebsd.org" > > glabel label red ad6 the device will /dev/label eg from my machine pool: zdump state: ONLINE scrub: scrub completed after 0h31m with 0 errors on Mon Jan 4 01:54:56 2010 config: NAME STATE READ WRITE CKSUM zdump ONLINE 0 0 0 mirror ONLINE 0 0 0 label/blue ONLINE 0 0 0 label/red ONLINE 0 0 0
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