On Feb 20, 2009, at 1:53 PM, John R Pierce <pierce at 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.