[olug] Software RAID / accidentally raidhotadd to wrong md

[Terry]

When you added the two partitions to the other raid
array, did it go through the whole syncing process on
both the drives?


--- lug at robotz.com wrote:
> I will type it in here....
> 
> /etc/raidtab
> 
> raiddev			/dev/md3
> raid-level		5
> nr-raid-disks		3
> chuck-size		64k
> oersustebt-superblock	1
> nr-spare-disks		0
> 
> device			/dev/hda3
> raid-disk		0
> device			/dev/hdb3
> raid-disk		1
> device			/dev/hdc3
> raid-disk		2
> 
> raiddev			/dev/md0
> raid-level		1
> nr-raid-disks		3
> chuck-size		64k
> oersustebt-superblock	1
> nr-spare-disks		0
> 
> device			/dev/hda1
> raid-disk		0
> device			/dev/hdb1
> raid-disk		1
> device			/dev/hdc1
> raid-disk		2
> 
> raiddev			/dev/md4
> raid-level		5
> nr-raid-disks		3
> chuck-size		64k
> oersustebt-superblock	1
> nr-spare-disks		0
> 
> device			/dev/hda2
> raid-disk		0
> device			/dev/hdb2
> raid-disk		1
> device			/dev/hdc2
> raid-disk		2
> 
> raiddev			/dev/md2
> raid-level		5
> nr-raid-disks		3
> chuck-size		64k
> oersustebt-superblock	1
> nr-spare-disks		0
> 
> device			/dev/hda5
> raid-disk		0
> device			/dev/hdb5
> raid-disk		1
> device			/dev/hdc5
> raid-disk		2
> 
> raiddev			/dev/md1
> raid-level		5
> nr-raid-disks		3
> chuck-size		64k
> oersustebt-superblock	1
> nr-spare-disks		0
> 
> device			/dev/hda6
> raid-disk		0
> device			/dev/hdb6
> raid-disk		1
> device			/dev/hdc6
> raid-disk		2
> 
> 
> 
> 
> At Wednesday, 31 March 2004, you wrote:
> 
> >Wow, paste your raidtab if you don't mind....let me
> >take a peek at that then read your stuff below. 
> That
> >will help....
> >
> >--- lug at robotz.com wrote:
> >> Issue summary:  Had problems with 1 of a 3 drive
> >> software raid array.
> >> Harddrive is not physically bad, but the array
> >> failed today on boot.
> >> Used “raidhotadd” to get all of the raid5
> partitions
> >> (md0 – md3) 
> >> up and running with the exception of the most
> >> important partition 
> >> (md4).
> >> 
> >> I accidentally tried to “raidhotadd” 2 of the 3
> >> drives from md4 into 
> >> md2.  Now hdb2 and hdc2 think they are part of
> md2
> >> when they actually 
> >> should be part of md4.  This is not reflected in
> >> /etc/raidtab but 
> >> must be stored somewhere I cannot find.
> >> (superblock?)
> >> 
> >> This leaves only 1 drive in md4 and therefore md4
> >> will not start 
> >> even degraded.  md4 is a RAID 5 partition, which
> is
> >> supposed to include 
> >> hda2, hdb2, and hdc2.  Since RAID wont start on
> md4,
> >> I cannot simply 
> >> use “raidhotremove” and “raidhotadd” to correct
> this
> >> mistake (assuming 
> >> that would correct the mistake).
> >> 
> >> I used “raidsetfaulty” to deactivate hdb2 to stop
> >> interfering with 
> >> the start of md2.  (because hdb2 belongs in md4
> and
> >> raidhotremove 
> >> refuses to get hdb2 out of md2 without
> deactivating
> >> the partition)
> >> 
> >> lsraid reports md0 – md3 correctly.  However,
> typing
> >> “lsraid –A –d 
> >> /dev/hdb2” or “lsraid –A –d /dev/hdc2” shows them
> as
> >> a member of 
> >> md2 still.  They should be in md4 instead.
> >> 
> >> My question #1:  Did my mistake hose the data in
> >> both hdb2 and hdc2 
> >> making it impossible to recover md4 (my most
> >> critical partition containing 
> >> /home) or is hdb2 and hdc2 merely confused about
> >> where they belong 
> >> but still within them is my critical data making
> >> recovery of md4 
> >> possible?
> >> 
> >> My question #2: If recovery is possible, should I
> >> then “mkraid /dev/md4 
> >> –f” and hope for the best or is there a safer way
> to
> >> _save_ my data? 
> >> Or perhaps there is a way to make hdb2 and hdc2
> >> realize again that 
> >> they are part of md4.   
> >> 
> >> Keep in mind that since md4 won’t start I can’t
> >> reverse the mistake 
> >> with raidhotadd.
> >> 
> >> If I failed to provide any details please let me
> >> know and I will 
> >> elaborate further.
> >> 
> >> Thank you.
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> _______________________________________________
> >> OLUG mailing list
> >> OLUG at olug.org
> >> http://lists.olug.org/mailman/listinfo/olug
> >
> >=====
> >Terry
> >
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> 
> 
> 
> 
> 
> 
> 
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=====
Terry

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