Create mirrored RAID set from existing drive and new drive?

D

dmcheng

Registered
Hello. I have a PowerMac G3 running OS X Server 10.4.7. There is an 80GB ATA boot hard drive and a SATA card and two 250GB SATA drives. One SATA drive is existing and has data on it; I just installed the second one because I want to mirror the 1st drive onto the 2nd one.

My questions are: how do I do it? When I try to create a RAID set in the Disk Utility GUI, it says all data will be destroyed. I cancelled that.

So I tried diskutil enableRAID mirror disk1, which told me I could only mirror volumes.

The volume name is RAID, so I tried diskutil enableRAID mirror /Volumes/RAID which gave me an error "Error enabling disk to RAID Could not unmount disk (-10000)"

When I unmounted the disk, I still got the same error.

When I tried diskutil verifyVolume disk1, I got an error "Error (-9958) encountered attempting to verify/repair disk1"

Do I need to run diskutil under sudo? It's not clear from the documentation. Do I need to change a jumper on the new SATA drive? Do I have the right file system (Apple_HFS)? Should I be using other RAID commands under diskutil to create the mirrored set?

Thanks in advance
David
 
To create a mirror of an existing Volume, you need to be booted off of secondary media. I will note that, while this worked flawlessly in Panther, I've seen it fail in Tiger, causing data corruption. Your best bet is to create a Mirror set with the two 250GB drives and then replicate the 80GB Volume onto it. If you attempt to mirror an 80GB drive with a 250GB drive, you'll lose disk space and may have non-optimal performance.

Hope this helps!

Michael
 
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