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Possibly recover a missing RAID stripe? orr mirror?
Authored by: nhl00 on Jul 18, '05 10:54:12PM

I have two external firewire drives set up as a RAID mirror. One of them is no longer being recognized as part of the RAID. The whole reason for my chosing this set up was to get a level of protection for my photos.

I'm curious if you could elaborate on your comments on how to restore the mirror in this case (as opposed to the stripe).

I should point out that I don't know how long ago the RAID stopped being a RAID and therefore must assume that the missing drive is not up to date with the data on the functioning half.

Thanks
Frank



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Possibly recover a missing RAID stripe? orr mirror?
Authored by: Shawn Parr on Jul 19, '05 11:44:38PM

On the drive that is no longer being recognized, use Disk Utility to format it as a Unix disk (this seems to clear out more low level info than an HFS type format).

Then format it so that it looks like the other disk partition & format-wise.

Then use Disk Utility to rebuild the RAID. I am sorry I don't have in-depth info for this as I don't have any software RAID's currently.

As a side note, I had a Mac OS X Server set up using a Disk Utility RAID1 mirror for a while. Turns out that it also lost sync between the disks, and later on the remaining disk became corrupted. One rebuild later and I convinced the department I was working for to get a hardware unit. In this case it was the eRAID from Firewire depot. Any failures and there is an alarm and LEDs to diagnose. Much better than a software RAID IMHO. We unfortunately had a drive failure 2 weeks after we installed the RAID, but due to it being RAID5 we lost no uptime, and were immediately notified by the audible alarm.

Quite frankly if I am concerned enough about my data being reliable, I would never trust a software RAID system. Backup is much more reliable, and if you need all that online and reliable hardware RAID is the only real solution.



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Possibly recover a missing RAID stripe? orr mirror?
Authored by: nhl00 on Jul 21, '05 12:39:03AM

Cheers for the details...

The eRAID box looks interesting, but is outside of my budget - this is for my personal photo collection not work. I do keep a back up, the idea of setting up a RAID mirror was to catch a drive failure between backups.

Frank



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