[PLUG] Hot-swapping Linux RAID1 (was Re: Computer case)

[JP Vossen <jp@jpsdomain.org>]

On 06/13/2011 12:51 PM, plug-request@lists.phillylinux.org wrote:
> Date: Mon, 13 Jun 2011 12:51:46 -0400
> From: Julien Vehent<julien@linuxwall.info>

>   I've never tried hot swapping sata drives used in a linux soft raid.
>   Might be an interesting experience though:)

I have not tried this, but I'd *guess* that if you use 'mdadm' 
appropriately, it would be fine.  YMMV!

Before:
	mdadm --manage $RAID --fail $DISK
	mdadm --manage $RAID --remove $DISK

After hot-swap:
	sfdisk -d $GOOD_DISK | sfdisk $BAD_DISK
	mdadm --manage $RAID --add $DISK

One of the tricks is to get "$RAID" & "$DISK" right.  'cat /proc/mdstat' 
can help.  And you may need to loop though the mdadm commands if you've 
got multiples of anything.

See http://www.kernelhardware.org/replacing-failed-raid-drive/ for more 
info.

Let us know if this works,  :-)
JP
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