OSX Mirrored Raidset Recovery

Today I experienced a firewire drive failure on my mini. To determine which drive was bad was a bit difficult since the apple profiler does not show serial number information about the drives and the firewire id can change depending on which drive was ready first, etc. After the experience I now have the following steps to take to make this easier in the future. The follow was done after I replaced the bad drive — There also appears to be a Disk Utility issue with disk replacements do I went the terminal window instead.

mini:~ sean$ sudo su –
Password:
mini:~ root# diskutil list
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *74.5 Gi disk0
1: EFI 200.0 Mi disk0s1
2: Apple_HFS Macintosh HD 74.2 Gi disk0s2
/dev/disk1
#: TYPE NAME SIZE IDENTIFIER
0: FDisk_partition_scheme *465.8 Gi disk1
1: DOS_FAT_32 SPAREY 465.6 Gi disk1s1
/dev/disk2
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *279.5 Gi disk2
1: EFI 200.0 Mi disk2s1
2: Apple_HFS Timie 279.2 Gi disk2s2
/dev/disk3
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *931.5 Gi disk3
1: EFI 200.0 Mi disk3s1
2: Apple_RAID 931.2 Gi disk3s2
3: Apple_Boot Boot OSX 128.0 Mi disk3s3
/dev/disk4
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *931.5 Gi disk4
1: EFI 200.0 Mi disk4s1
2: Apple_HFS Untitled 1 931.2 Gi disk4s2
/dev/disk5
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS Hugie *931.2 Gi disk5

mini:~ root# diskutil checkraid
RAID SETS
———
=================================================================
Name: Hugie Disk
Unique ID: EAA0BF40-5431-4DBF-B280-5D96983C4C18
Type: Mirror
Status: Degraded
Size: 999860862976 B
Rebuild: automatic
Device Node: disk5
Apple RAID Version: 2
——————————————————————————-
# Device Node UUID Status
——————————————————————————-
0 disk3s2 BCE5791A-9FBC-471F-BCCB-AB0B9DB0A81E Online
0 -none- FC7931AC-A4F3-468F-AC75-F48C60EABFEF Missing/Damaged
=================================================================

mini:~ root# diskutil repairmirror /Volume/Hugie disk4
Could not find the RAID set device node

mini:~ root# diskutil repairmirror /Volumes/Hugie disk4
Note: Syncing data between mirror partitions can take a very long time.
Note: The mirror should now be repairing itself. You can check its status using ‘diskutil listRAID’.

mini:~ root# diskutil checkraid
RAID SETS
———
==================================================================
Name: Hugie Disk
Unique ID: EAA0BF40-5431-4DBF-B280-5D96983C4C18
Type: Mirror
Status: Degraded
Size: 999860862976 B
Rebuild: automatic
Device Node: disk5
Apple RAID Version: 2
——————————————————————————-
# Device Node UUID Status
——————————————————————————-
0 disk3s2 BCE5791A-9FBC-471F-BCCB-AB0B9DB0A81E Online
1 disk4s2 21FA4F0B-7637-40CD-B396-A2C7D64589DA 0% (Rebuilding)
===============================================================================
mini:~ root#