Rescue software RAID system

[Lennart Sorensen]

On Tue, Feb 04, 2014 at 04:35:06PM -0500, William Muriithi wrote:
> > > > > Have already tried this with the same error. I suspected the two
> commands
> > > > > are like alias.
> > > >
> > > > What is the current state of the raid:
> > > >
> > > > cat /proc/mdstat
> > > >
> > >
> > > Looks like its inactive.
> > >
> > > Personalities : [raid1] [raid6] [raid5] [raid4]
> > >
> > > md2 : inactive sdb2[1] sdc2[3] 5692755968 blocks super 1.2
> > >
> > > md0 : active raid1 sda1[2] sdb1[1] 83886008 blocks super 1.0 [2/2] [UU]
> bitmap: 0/1 pages [0KB], 65536KB chunk
> > >
> > > unused devices: <none>
> > > > --
> > > > Len Sorensen
> > Actually this got me in the proper path. I googled for inactive raid
> device and I it does look like you need to stop it first.
> >
> > Then, I started it and got this message
> > mdadm --assemble /dev/md2 /dev/sda2 /dev/sdb2 /dev/sdc2
> >
> > mdadm: device 3 in /dev/md2 has wrong state in superblock, but /dev/sda2
> seems ok
> > mdadm: /dev/md2 assembled from 2 drives and 1 spare - not enough to start
> the array while not clean - consider --force.
> >
> > Have never liked to use force.
> >
> So I did force the assembly and all seem fine now. Thanks a lot Len. I am
> good now.
> 
> mdadm --assemble --force /dev/md2 /dev/sda2 /dev/sdb2 /dev/sdc2 mdadm:
> clearing FAULTY flag for device 0 in /dev/md2 for /dev/sda2 mdadm: Marking
> array /dev/md2 as 'clean' md/raid: md2: raid level 5 active with 2 out of 3
> devices, algorithm 2 mdadm: /dev/md2 has started with 2 drives (out of 3)
> and 1 spare
> 
> cat /proc/mdstat
> 
> Personalities : [raid1] [raid6] [raid5] [raid4] md2 : active raid5 sdb2[1]
> sda2[4] sdc2[3] 5692754944 blocks super 1.2 level 5, 512k chunk, algorithm
> 2 [3/2] [_UU] [>....................] recovery = 1.7% (50805888/2846377472)
> finish=431.8min speed=107884K/sec
> 
> md0 : active raid1 sda1[2] sdb1[1] 83886008 blocks super 1.0 [2/2] [UU]
> bitmap: 0/1 pages [0KB], 65536KB chunk
> 
> unused devices: <none>
> 
> /dev/md2: Version : 1.2 Creation Time : Thu Dec 13 11:04:35 2012 Raid Level
> : raid5 Array Size : 5692754944 (5429.03 GiB 5829.38 GB) Used Dev Size :
> 2846377472 (2714.52 GiB 2914.69 GB) Raid Devices : 3 Total Devices : 3
> Persistence : Superblock is persistent
> 
> Update Time : Tue Feb 4 16:18:14 2014 State : clean, degraded, recovering
> Active Devices : 2 Working Devices : 3 Failed Devices : 0 Spare Devices : 1
> 
> Layout : left-symmetric Chunk Size : 512K
> 
> Rebuild Status : 11% complete
> 
> Name : gfs1.jamar.com:2 (local to host gfs1.jamar.com) UUID :
> 0202547e:d9a3bd67:fdeaf168: a780aa38 Events : 6296
> 
> Number Major Minor RaidDevice State 4 8 2 0 spare rebuilding /dev/sda2 1 8
> 18 1 active sync /dev/sdb2 3 8 34 2 active sync /dev/sdc2

That looks good. :)

-- 
Len Sorensen
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