On Thu, Dec 27, 2012 at 12:52 PM, Mark Knecht <markknecht@xxxxxxxxx> wrote: > On Thu, Dec 27, 2012 at 12:25 PM, Phil Turmel <philip@xxxxxxxxxx> wrote: >> Whoops! The list was dropped... >> >> On 12/27/2012 03:24 PM, Phil Turmel wrote: >>> On 12/27/2012 03:20 PM, Mark Knecht wrote: >>>> Thanks Phil, >>>> I've added the device back in and the rebuild is proceeding. >>>> >>>> So the new piece of info here for me is this idea of a bitmap. I'll >>>> have to go look into that, but a quick question - is that something >>>> that can be added to the RAID6 at this time, or can you only do that >>>> when you first build it? As I have some issue with my (possibly) >>>> initramfs I expect I'll kick the devices a few more times before I get >>>> it worked out. Would be nice if putting the disk back in didn't take >>>> so long. >>> >>> You can add a bitmap to any v1.x array after the fact with "--grow". It >>> does add a little overhead to the write path, so you might not want it >>> in a heavily loaded server. For a test-bed or other system prone to >>> crashes, it's a godsend. >>> >>> Phil > > > So it was. Thanks for catching that. > > OK, so adding the bitmap looks straight-forward > > mdadm --grow --bitmap=internal /dev/md3 > > and then wait, although I think I can continue to use the RAID while > this is progressing. > > I cannot see that someone like me (or rather my usage model - home > compute server doing 2 or 3 fairly heavily loaded Windows VMs most of > the day) would want anything other than an internal bitmap, correct? > Note that the VM files actually reside on a different RAID, which is > rather unfortunately part of the same set of disks but different > partitions. As I said, this has been a learning process. (!) My hope > is that over time I can move all of these different things to this one > RAID6, reclaim disk space, grow the RAID6, etc., until I get the whole > disk back. > > Thanks, > Mark So I went ahead and tried adding it, first to md6 which has a different usage and then to md3. It only takes a couple of seconds to add and no problems so far. - Mark -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
