Rudi Ahlers wrote:
On Wed, Oct 20, 2010 at 4:34 AM, Nataraj <incoming-centos@xxxxxxx> wrote:
When I create my Raid arrays, I always use the option --bitmap=internal.
With this option set, a bitmap is used to keep track of which pages on
the drive are out of date and then you only resync pages which need
updating instead of recopying the whole drive when this happens. In the
past I once added a bitmap to an existing raid1 array using something
like this. This may not be the exact command, but I know it can be done:
mdadm /dev/mdN --bitmap=internal
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How do you add --bitmap=internal to an existing, running RAID set? I
have tried with the command above but got the following error:
try mdadm /dev/md2 -Gb internal
also it pays to have everything clean first and check you have a
persistent superblock
i.e. mdadm -D /dev/md2
HTH
[root@intranet ~]# mdadm /dev/md2 --bitmap=internal
mdadm: -b cannot have any extra immediately after it, sorry.
[root@intranet ~]# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 hda1[0]
104320 blocks [2/1] [U_]
md2 : active raid1 sda1[0] sdb1[1]
244195904 blocks [2/2] [UU]
md1 : active raid1 hda2[0]
244091520 blocks [2/1] [U_]
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