On 07/02/20 07:02, Ram Ramesh wrote: > I got no response on this and want to take a shot before going the > backup way. > > Assuming (hda1 and hdb1 in raid1 md0) Will the following work? > > 1. Fail and remove hdb1 > 2. Create new RAID1 md1 with hdb1 and missing > 3. dd md0 onto md1 I wouldn't bother with any of the above. Just shut down and physically remove a LIVE disk. That now is your backup. In fact, this might be a good excuse to get a 3rd disk and either go raid 5 or use it for backups. > 4. Make both bootable. (I suppose I need to change UUID of md1 > partitions. I suppose that is easy) Yes it's easy. Yes it should have been done a LOOONG time ago. > 5. Boot both and double check They'll be degraded, so you might have to do a forced assembly to make them run ... > 6. Now upgrade md0 without fear. > 7. Boot and test the new system for a couple of days to make sure > everything is fine. > 8. If that fails, delete md0, and add hda1 to md1. If not delete md1 > and add hdb1 to md0 Yup. > > Regards > Ramesh > Cheers, Wol
