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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