On Feb 20, 2009, at 1:53 PM, John R Pierce pierce@hogranch.com wrote:
Stephen Leonard Character wrote:
So, to change my swap to raid1, I would need to unmount it, delete the md2 device, and rebuild it as a raid1 md2 device?
swapoff /dev/md2 # now delete the raid0 and build a raid1 mkswap /dev/md2 swapon /dev/md2
and you probably don't have to change your /etc/fstab assuming the metadevice name stays the same.
Since he'll have 4 md partitions after breaking the raid0, create 2 raid1 mds and add them both as priority 1 swap devices and the kernel will stripe pages across them.
-Ross
PS I prefer to create swap from LVM so to bypass this whole mess all together. LVM and RAID both come from device-mapper, so it's proven reliable and well performing technology. I wish ZFS was GPL'd though so Linux could adopt it and we'd be done talking about file systems and volume managers.