On Mon, 24 Oct 2011 21:19:22 +0100 Michael Busby <michael.a.busby@xxxxxxxxx> wrote: > Ok thanks, i have 1 small issue, when added the extra disk its been > maked as spare, is this normal? > > Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] > [raid4] [raid10] > md0 : active raid6 sde[0] sdg[6](S) sda[4] sdb[3] sdd[2] sdc[1] > 7814055936 blocks super 1.0 level 6, 512k chunk, algorithm 18 > [6/5] [UUUUU_] > [>....................] reshape = 3.0% (59244544/1953513984) > finish=11122.8min speed=2837K/sec > It looks like the extra drive was added after you started the grow. So it is still a spare. Once the grow finishes you will have a singly-degraded RAID6. Then it will immediately start recovering the missing device to the spare. Did you add the extra drive after starting the grow - or before?? NeilBrown > > > > On 24 October 2011 21:14, NeilBrown <neilb@xxxxxxx> wrote: > > On Mon, 24 Oct 2011 17:03:46 +0100 Michael Busby <michael.a.busby@xxxxxxxxx> > > wrote: > > > >> should the speed be very slow when doing this progress, its a lot > >> slower than a normal grow > > > > Yes. > > The array is being reshaped in-place. i.e. data is being read from part of > > the array, rearranged, and written back to the same part of the array. > > As you can imagine, this is risky - a crash will leave an inconsistent state. > > Hence the backup file. Everything in the array is first written to the > > backup file, then back to the array. So it is slow. > > > > A "normal" grow is writing to somewhere where there is no valid data, so it > > doesn't need the backup. > > > > I do have a plan to make this faster.... but I have lots of plans and little > > time. > > > > NeilBrown > > > > > > > > > >> > >> reshape = 1.2% (25006080/1953513984) finish=12481.8min speed=2574K/sec > >> > >> On 24 October 2011 15:11, Mathias Burén <mathias.buren@xxxxxxxxx> wrote: > >> > On 24 October 2011 14:11, Michael Busby <michael.a.busby@xxxxxxxxx> wrote: > >> >> At the moment i have a raid5 setup with 5 disks, i am looking to add a > >> >> 6th disk and change from raid 5 to raid 6 > >> >> > >> >> having looked at Neil's site i have found the following command, and > >> >> just want to double check this is still the recommend way of > >> >> converting > >> >> > >> >> mdadm --grow /dev/md0 --level=6 --raid-disks=6 --backup-file=/home/md.backup > >> >> > >> >> also would i need to add the extra disk before or after the command? > >> >> > >> >> cheers > >> >> -- > >> >> 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 > >> >> > >> > > >> > Hi, > >> > > >> > I grew my 6 disk RAID5 to a 7 disk RAID6. First, add the drive. Then > >> > partition it as required. Then add the drive to the array (I think > >> > it'll become a spare?). Then you can grow it. > >> > > >> > Make sure you're using the latest mdadm tools available. > >> > > >> > Regards, > >> > Mathias > >> > > >> -- > >> 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 > > > >
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