On Wed, 26 Oct 2011 08:38:00 +0200 David Brown <david@xxxxxxxxxxxxxxx> wrote: > On 26/10/2011 03:43, NeilBrown wrote: > > The following series - on top of my for-linus branch which should appear in > > 3.2-rc1 eventually - implements hot-replace for RAID4/5/6. This is almost > > certainly the most requested feature over the last few years. > > Fantastic news - well done, and thanks for all your work (and to the > other md developers too, of course). > > > I hope to submit this together with support for RAID10 (and maybe some > > minimal support for RAID1) for Linux-3.3. By the time it comes out > > mdadm-3.3 should exist will full support for hot-replace. > > > > Hot-replace for RAID1 is surely just a normal "add", a resync, a "fail", > and a "remove"? So support here should be mainly about the consistency, > such as supporting the same "replaceable" tag. RAID10, I imagine, would > be more complicated. Zigactly. The thing that particularly needs to work for RAID1 is if you have an array with a spare and you have bad-block-logs enabled and you get a write error, then the write error needs to be logged, but also recovery needs to start onto the spare and when that completes the drive with the write error should be failed. I just need to add enough bit so that works, which shouldn't be hard. NeilBrown
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