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Re: replacing a failed RAID component

On Nov 7, 2009, at 11:47 AM, Stephen Borrill wrote:

On Sat, 7 Nov 2009, Steven Bellovin wrote:
I'm using RAIDFRAME in a RAID 1 configuration. One of the disks has failed and needs to be replaced; the question is how, precisely, I do it. More specifically, how do I prepare the new disk? My assumption is that I have to set up the proper fdisk label (including the boot block); I then have to use disklabel to make the 'e' partition of type RAID. The last thing I should do is use 'raidctl -R' to reconstruct the RAID set.

Do I need to do anything else? Do I need to do something to initialize the replacement disk's RAID stuff?

A cheap hack is to use dd to copy the first few sectors (i.e. including mbr code, fdisk partition table and diskabel) from one disk to the other.

Then use raidctl -a, raidctl -F, etc. to rebuild the array.

-a and -F? I was assuming I could just do -R. I confess that I'm quite unclear about the difference here.

I had thought about the dd hack, but was unsure if there things like a disk name that I shouldn't copy over that way.

                --Steve Bellovin,

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