SUMMARY: StorEdge StorEdge T3: RAID5 still fault tolerant after disk problem?

On Tuesday 16 September 2003 01:25, you wrote:

Thx, to Allan McAleavy for his help.

We were not able to find a command that shows different
output for the standby disk before and after a data disk
fail.  Also there's no info about the standby disk taking
over in the logs.

Sun hotline told me that the 'substituted' state of a
damaged data disk is the only indicator that the standby
disk has taken over the role of the data disk.

I personally consider this a grave human interface bug of
the T3 buildin management software :(

Nevertheless Sun was proven right because after the the
bad disk was replaced with a new one, the standby disk and
new data disk exchanged data according to the disk activity
lights. 

Achim
> Hi,
> one disk has problems in my StoreEdge T3 box.  It's RAID5 with one
> standby disk:
> 
> volume        capacity   raid   data     standby
> v0            253.4 GB    5     u1d1-8    u1d9
> 
> After the disk problem, fru stat shows
> 
> ..
> DISK    STATUS   STATE       ROLE        PORT1      PORT2      TEMP  VOLUME
> ------  -------  ----------  ----------  ---------  ---------  ----  ------
> u1d1    ready    enabled     data disk   ready      ready      35    v0
> u1d2    ready    enabled     data disk   ready      ready      34    v0
> u1d3    fault    substituted data disk   notReady   notReady   -     v0
> u1d4    ready    enabled     data disk   ready      ready      34    v0
> u1d5    ready    enabled     data disk   ready      ready      34    v0
> u1d6    ready    enabled     data disk   ready      ready      34    v0
> u1d7    ready    enabled     data disk   ready      ready      34    v0
> u1d8    ready    enabled     data disk   ready      ready      35    v0
> u1d9    ready    enabled     standby     ready      ready      34    v0
> ..
> 
> After one disk failed I would assume that the 'role' of the standby
> disk changes to 'data disk' but it's still 'standby'.
> 
> So question is: is the standby disk actually used in the RAID5
> (and therefore the RAID5 would survive another disk failure).
> If not: does
> 
> 	vol recon u1d3 to_standby
> 
> incorporate the standby disk into the RAID5 array?  Why didn't
> that happen automaticly?????
> 
> Neverthelesss I will order a new disk ASAP.
> 
> Thx for any info,
> Achim
> 
> -- 
>   To me vi is Zen.  To use vi is to practice zen. Every command is
>   a koan. Profound to the user, unintelligible to the uninitiated.
>   You discover truth everytime you use it.
>                                       -- reddy@lion.austin.ibm.com
> 
> 
> 

-- 
  To me vi is Zen.  To use vi is to practice zen. Every command is
  a koan. Profound to the user, unintelligible to the uninitiated.
  You discover truth everytime you use it.
                                      -- reddy@lion.austin.ibm.com
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