Replacing both disks in RAID1

Toomas Aas toomas.aas at
Thu Jan 13 07:42:23 PST 2005

Toomas Aas wrote:

> I have a small server running FreeBSD 4.10, 2 x 80 GB drives mirrored on 
> Promise TX2 integrated RAID1 controller. I'd like to replace the 80 GB 
> drives with 200 GB drives.
> Here's my current plan:
> 1. Attach one of the new drives to free ICH4 IDE port on motherboard, 
> partition it and transfer the data using dump/tar.
> 2. Remove the 80 GB drives, attach 200 GB drives (one with data, one 
> blank) to TX2 IDE ports and re-create the mirror using Promise onboard 
> BIOS utility.
> 3. Reboot, fix the fstab (if necessary) and be done with it.
> I have one doubt with it. Currently my partitions are ar0s1a (/), ar0s1b 
> (swap), ar0s1e (/var) etc. When I create corresponding partitions on the 
> new drive while it is attached to ICH4 controller, the partitions are 
> created as ad0s1a, ad0s1b etc. When I then move this drive to TX2 port 
> and re-create the mirror the partitions should again be ar0s1a, ar0s1b 
> etc. Will it "just work" or will it not work at all?

Another thought - maybe I shouldn't create the new array using the 
Promise BIOS utility, but instead should bring the server up and use 
'atacontrol create RAID1'? What do you think? Which method has a better 
chance of success?

Toomas Aas --------------------------------------------------------
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