Help! Raid-5 with 4 drives, one bad and one wants to be a spare

[Gilboa Davara]

How many drives were actually members of the raid?
3 + 1 or 2 + 1 + 1?
Please post the raid configuration.

Gilboa


On Thu, 2005-09-22 at 12:46 -0500, Ed K. wrote:
> I had a computer running FC1 for a very long while. All 4 ide drives are a 
> part of a Raid-5 array.
> 
> Then a drive (#4) crapped out, and took down the other drive (#3) on the 
> same ide bus... I would like to turn the raid back on, but when I do the 
> raid subsystem thinks its spare.
> 
> Q: How can I turn the raid back on in degraded mode without the #3 drive 
> being used as a spare?
> 
> ...waiting for some pointers so I can sleep tonight, so any help would be 
> most appreciated.
> 
> ed
> 
> p.s.:
> I've booted the system in knoppix v3.9 now...
> 
> here are the commands:
> 
> root at 1[~]# mdadm --assemble /dev/md2 -R /dev/hda4 /dev/hdb4 /dev/hdc1
> mdadm: failed to RUN_ARRAY /dev/md2: Invalid argument
> root at 1[~]# mdadm -D /dev/md2
> /dev/md2:
>          Version : 00.90.01
>    Creation Time : Mon Feb 23 21:13:37 2004
>       Raid Level : raid5
>      Device Size : 117185984 (111.76 GiB 120.00 GB)
>     Raid Devices : 4
>    Total Devices : 3
> Preferred Minor : 2
>      Persistence : Superblock is persistent
> 
>      Update Time : Thu Sep 22 14:07:32 2005
>            State : active, degraded
>   Active Devices : 2
> Working Devices : 3
>   Failed Devices : 0
>    Spare Devices : 1
> 
>           Layout : left-asymmetric
>       Chunk Size : 64K
> 
>      Number   Major   Minor   RaidDevice State
>         0       3        4        0      active sync
>         1       3       68        1      active sync
>         2       0        0        -      removed
>         3       0        0        -      removed
> 
>         4      22        1        -      spare
> root at 1[~]# mdadm -S /dev/md2