On Wed, Oct 20, 2010 at 4:34 AM, Nataraj <incoming-centos at rjl.com> 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 the drive are out of date and then you only resync pages which need 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 > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > How do you add --bitmap=internal to an existing, running RAID set? I have tried with the command above but got the following error: [root at intranet ~]# mdadm /dev/md2 --bitmap=internal mdadm: -b cannot have any extra immediately after it, sorry. [root at 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_] -- Kind Regards Rudi Ahlers SoftDux Website: http://www.SoftDux.com Technical Blog: http://Blog.SoftDux.com Office: 087 805 9573 Cell: 082 554 7532