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Re: Failed Software RAID

Julian

On Dec 31, 2005, at 4:01 AM, email@hidden wrote:

Hello list,

I have a first generation XServe, with a 60GB boot drive and three 120GB
7200 RPM "Apple branded" IBM Deathstars which are in a RAID-0
configuration. Lo and behold one of the RAIDed drives failed. What
I've done is this, and am asking for any suggestions on the best course
of action to take at this point.

The failed drive was completely dead, I was able to swap the IO board
with another one of the drives to get the drive spinning up again. I am
able to see the drive successfully, it appears as slice 2, and I see the
RAID container name in Disk Utility (attached to a workstation G4.)

Should I buy a replacement drive from Apple, use Ghost 4 Linux (G4L),
copy the failed disk to the new one, then put the drives back into the
XServe?

If I did this, do you think I would have to run any repairs on the
array, or do you think the RAID volume would just pop up like nothing
happened?

Thanks for any advise!

Julian

If the drive works with the new controller attached, you can just dd the entire disk onto a larger disk and you should be good to go. You will need to copy the entire disk as you will need the partition map as well as the partition which contains the part of the volume. We copy entire disks onto larger drives all the time and have no problem with it (both APM and GPT formatted disks). Remember when you use dd to set the block sizes for the transfer or you will be there all day. Your command should look something like:

sudo dd if = /dev/rdisk1 of=/dev/rdisk3 bs=256

This will transfer in 128kb blocks which is the largest the drives can handle.


On Dec 31, 2005, at 4:01 AM, email@hidden wrote:

Yeah. Problem is, backup is not so current for this client. For a
software RAID, the slices get counted 1,2,3 versus 0,1,2, is that
correct? I would REALLY like to be able to fix the broken RAID.
Unfortunately Apple doesn't sell 120GB drives anymore. Would anyone see
a problem taking any 250GB 7200 RPM hard drive and cloning over the
120GB volume to it, then putting it back into the XServe, and firing it
up?


If you just copy the entire drive, you won't have to know anything about slices.

	Let me know if you need more help

	Tim Standing
	SoftRAID, LLC
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