On Tue, 26 Apr 2005, Chris Mason (Lists) wrote:
> I have a server that was setup with RAID1 so that the data would not be lost
> on a drive failure. However, I since realized I did not RAID the swap file
> and so in the event of a drive failure the server would crash.
> How can I convert the swap partition to RAID? I replaced /dev/hdc and
> partitioned it tbe same as /dev/had, and rebuild /dev/md0 and /dev/md1, but
> need to find a way to get the swap to be /dev/md2.
>
>
> Device Boot Start End Blocks Id System
> /dev/hda1 * 1 26 208813+ fd Linux raid autodetect
> /dev/hda2 27 153 1020127+ 82 Linux swap
> /dev/hda3 154 24792 197912767+ fd Linux raid autodetect
>
> Device Boot Start End Blocks Id System
> /dev/hdc1 * 1 26 208813+ fd Linux raid autodetect
> /dev/hdc2 27 153 1020127+ 82 Linux swap
> /dev/hdc3 154 24792 197912767+ fd Linux raid autodetect
>
> [root@mercury root]# cat /proc/mdstat
> Personalities : [raid1]
> read_ahead 1024 sectors
> md1 : active raid1 hdc3[2] hda3[0]
> 197912640 blocks [2/1] [U_]
> [>....................] recovery = 1.3% (2665008/197912640)
> finish=306.1min speed=10625K/sec
> md0 : active raid1 hdc1[1] hda1[0]
> 208704 blocks [2/2] [UU]
Try this:
Turn off all existing swaps:
swapoff -a
Verify this by:
cat /proc/swaps
then create a RAID-1 out of hda2 and hdc2:
mdadm --create /dev/md2 --level=1 --raid-disks=2 /dev/hda2 /dev/hdc2
Now use (c)fdisk to change partition type from swap to 0xFD on both hda2
and hdc2. (so it'll be autodetected the next time you reboot)
Create a swap partition on the new md2 (no need to wait for the resync
to finish)
mkswap /dev/md2
Edit /etc/fstab to change the swap mount to
/dev/md2 none swap sw 0 0
Activate the new swap:
swapon -a
Enjoy,
Gordon
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