RAID
Data Recovery
Example
case studies - Mac
Business
Type: Animation Studio
Location: London
RAID Type: 4 disk NAS RAID 0 server
Volume of data: 0.5 Terrabyte
Disk type: 4 x 123Gb IBM Deskstar IDE disks
Operating System: Mac OS 9
Service: Emergency (within 48 hours)
Downtime: 2 days - data was recovered over the
weekend
Outcome: Data
recovered successfully
Overview: This film studio had been preparing
animation sequences for use in a new British film. They were using
a striped RAID array to give them the necessary throughput for
real-time video editing. Without warning they lost all access
to the RAID server and the data on it.
Notes: The RAID server used 4 IBM Deskstar hard
disks. Diagnosis showed that one of the disks had stopped functioning
as it had developed a fault in its NV-RAM firmware. Faults of
this kind are notorious on IBM
Deskstar hard disks. Fortunately, the problem
was caught early, the drive re-programmed, the data re-synchronised
and fully recovered.
Business
Type: Graphic design and advertising company
Location: Greater Manchester
RAID Type: 5 disk NAS RAID 5 server
Volume of data: 180 Gb
Disk type: 5 x 36Gb SCSI disks
Operating System: Mac OS X
Service: Priority (2 - 4 days)
Downtime: 4 days
Outcome: Data
recovered successfully
Overview: The information held on this RAID was
primarily high resolution art and design work to be used in the
advertising sector. After a system crash the company were unable
to bring the RAID back online. The problem was further compounded
as a member of staff had removed each drive to check for visible
damage and then forgotten what order the drives were in.
Notes: It was first necessary to identify the
correct order of the disks with the RAID array. Once this was
achieved, analysis showed that the system crash had caused a corruption
to the filesystem. This was carefully repaired and the data recovered
to a large IDE hard disk.
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Links:
> 8
Golden rules to follow to minimize data loss
> Minimizing
data loss on RAID arrays and servers
> RAID
data recovery case studies: Windows
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