Hey Steve, Those numbers correspond to the role of the device in the array.
This may help you: https://raid.wiki.kernel.org/articles/m/d/s/Mdstat.html Anyone know of any better documentation? Bryan On Wed, Feb 1, 2012 at 4:03 AM, Steve Wolf <[email protected]> wrote: > I have raid set up on my linux computer. > I had a drive fail. > > I ran mdadm -add /dev/md2 /dev/hda2 > > > Which fixed the drive. For the moment. However I'm confused what [0] > or [1] or [2] means at the end of these drive descriptions in some > circumstances. > > > Fore example ... When I ran the command > > > cat /proc/mdstat > I get .... > > > [root@smclinux ~]# cat /proc/mdstat > Personalities : [raid1] > md2 : active raid1 hda2[0] hdb2[1] > 38973568 blocks [2/2] [UU] > > > md1 : active raid1 hda1[0] hdb1[1] > 104320 blocks [2/2] [UU] > > > unused devices: <none> > > > But when i was rebuilding the drive with the first command mentioned > and then ran the command > > > # watch -n .1 cat /proc/mdstat (Which basically watches the rebuild) > I saw this ... > > > Every 0.1s: cat /proc/mdstat Tue Jan 31 > 15:24:05 2012 > > > Personalities : [raid1] > md2 : active raid1 hda2[2] hdb2[1] > 38973568 blocks [2/1] [_U] > [=>...................] recovery = 7.8% (3072384/38973568) > finish=40.1min speed=14912K/sec > md1 : active raid1 hda1[0] hdb1[1] > 104320 blocks [2/2] [UU] > > > unused devices: <none> > > > I know this looks all very complex but really all Im interested in > understanding is what the [2] in the hda2[2] or [1] in hdb2[1]. > > > I thought it meant the disk in the array, but that doesnt make sense > really. The system only has two drives. but now I see [0] [1] and [2] > (when rebuilding) > thats 3 disks in the above output . So I must be wrong. Can anyone > help me sort out what the [#] means and the end of the drive > description. > > thanks. > > -- > You received this message because you are subscribed to the Linux Users > Group. > To post a message, send email to [email protected] > To unsubscribe, send email to [email protected] > For more options, visit our group at > http://groups.google.com/group/linuxusersgroup > References can be found at: http://goo.gl/anqri > Please remember to abide by our list rules (http://tinyurl.com/LUG-Rulesor > http://cdn.fsdev.net/List-Rules.pdf) > -- A healthy diet includes Linux, Linux, and more Linux. -- You received this message because you are subscribed to the Linux Users Group. To post a message, send email to [email protected] To unsubscribe, send email to [email protected] For more options, visit our group at http://groups.google.com/group/linuxusersgroup References can be found at: http://goo.gl/anqri Please remember to abide by our list rules (http://tinyurl.com/LUG-Rules or http://cdn.fsdev.net/List-Rules.pdf)
