RAID1 Missing Partition

C

Carlosinfl

Loves the juice
Joined
Sep 25, 2002
Messages
6,633
I noticed today on my Arch Linux system that /dev/sda3 is missing from the mirror. I don't understand why or how to resolve this. Can someone please assist me in repairing the broken mirror?

Code: 
[root@mail ~]# cat /proc/mdstat
Personalities : [raid1] 
md2 : active raid1 sdb3[1]
      728571776 blocks [2/1] [_U]
      
md1 : active raid1 sda2[0] sdb2[1]
      2000000 blocks [2/2] [UU]
      
md0 : active raid1 sda1[0] sdb1[1]
      1999936 blocks [2/2] [UU]

Then I checked to see if the following had any info...

Code: 
[root@mail ~]# mdadm --misc --detail /dev/md2
/dev/md2:
        Version : 0.90
  Creation Time : Thu Oct 29 04:48:38 2009
     Raid Level : raid1
     Array Size : 728571776 (694.82 GiB 746.06 GB)
  Used Dev Size : 728571776 (694.82 GiB 746.06 GB)
   Raid Devices : 2
  Total Devices : 1
Preferred Minor : 2
    Persistence : Superblock is persistent

    Update Time : Thu Oct 29 09:52:12 2009
          State : clean, degraded
 Active Devices : 1
Working Devices : 1
 Failed Devices : 0
  Spare Devices : 0

           UUID : f46bd6c9:01829ddb:1da0a365:a6c675d9
         Events : 0.13

    Number   Major   Minor   RaidDevice State
       0       0        0        0      removed
       1       8       19        1      active sync   /dev/sdb3
 
I won't mention hardware RAID, but I want to soooo badly... ;)

Oops, I guess I already did. :)
 
I don't see how this is actually helpful but I find software RAID to outperform most hardware RAID and I like the fact that I can monitor my RAID level from my OS as I am doing right now. If this was hardware RAID, I would not know about the problem unless I rebooted.
 
Carloswill said:
I don't see how this is actually helpful but I find software RAID to outperform most hardware RAID and I like the fact that I can monitor my RAID level from my OS as I am doing right now. If this was hardware RAID, I would not know about the problem unless I rebooted.
Click to expand...

It's not helpful... sorry for the first post thread-jack! :(
 
It's cool. I actually like software based RAID but it's personal preference in my opinion as to which is better.
 
Sometimes a simple re-add of the device will be sufficient to get the array back up. If this works, though, you may want to think about buying a new disk pronto.

Check man mdadm for more info.
 
Thanks all. Disk was fine. Just an issue with the Arch Linux configuration. I am simply going to switch back to a distro that is a bit more RAID friendly.
 
You must log in or register to reply here.
Back
Top