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

[Ed K.]

The RAID was constructed under FC1 with this in /etc/raidtab:

raiddev             /dev/md2
raid-level                  5
nr-raid-disks               4
chunk-size                  64
persistent-superblock       1
nr-spare-disks              0
     device          /dev/hda4
     raid-disk     0
     device          /dev/hdb4
     raid-disk     1
     device          /dev/hdc1
     raid-disk     2
     device          /dev/hdd1
     raid-disk     3


ed

On Fri, 23 Sep 2005, Gilboa Davara wrote:

> 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
>
>
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