On Wed, 2005-11-16 at 17:07 +0100, Masopust Christian wrote: > Hi all, > > i would like to mirror my existing FC4-installation. I already added a > second harddisk and created partitions of the same size as my running > system-disk is. > > what to do next? > > how to mirror the running system? > > thanks a lot, > christian > 0. Boot from a CD. 1. Before you start, backup everything. (While it may be possible to mirror a live disk; I never tried it myself [and for a good reason: if it fails due to unknown reason, you are dead in the water.]) 2. Use fdisk to modify the label on both partitions to "Raid auto-detect" ('fb' If i recall correctly). 3. Use mdadm (or raidtools' mkraid) to create the mirror. 4. Restore the backup. 5. Restore the grub configuration. (/sbin/grub; root (hd<Drive ID>,<Partition ID>), setup (hd<Drive ID>); quit) Hope it helps. Gilboa