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
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
>> >> --
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>> >>
>> >
>> > 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
>> >
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>
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