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SCSI RAID Mirrored Array - What happens if the controller breaks?

Posted on 2004-04-22
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Last Modified: 2010-04-03
Hello all, following my previous question, we've decided to go with a single channel SCSI RAID controller from LSI, but I have one more check to make....

the question is...is it possible to read the data off a disk that had been in a mirrored SCSI RAID array from a normal SCSI controller, should our SCSI RAID controller die on us?

For example, if we connected our drives up to the SCSI RAID controller, and create a mirrored RAID array and then, at some point down the line, the RAID controller fails (_not_ a hard disk that is part of the array), would it be possible to bring the system back up by simply removing one of the disks from the broken controller, and connecting that disk to the working (original) SCSI non-RAID interface?

Cheers in advance
Ben
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Question by:bcops
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Pide earned 750 total points
ID: 10889816
No.
The way raw data is handled onto the SCSI disk differs from controller to controller (surely from brand to brand, sometimes from model to model on the same brand).

If you pick up a mirrored SCSI disk and want it to work, you should consider to have another "same-branded" controller on the recovery side.

For some simple ATA (onboard) controller it may work, but don´t count on it for complex (multi-RAID mode) SCSI/FC controllers.
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by:bcops
ID: 10890248
Cheers, that should be fine, and I think what we'll do is buy one controller, test to see whether the discs would be recoverable on a different controller, and then make our decisions on buying a second one based on that

The points are yours :-)
Ben
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