On Monday March 5, ralf@xxxxxxxx wrote: > > Is it possible to mark a disk as "to be replaced by an existing spare", > then migrate to the spare disk and kick the old disk _after_ migration > has been done? Or not even kick - but mark as new spare. No, this is not possible yet. You can get nearly all the way there by: - add an internal bitmap. - fail one drive - --build a raid1 with that drive (and the other missing) - re-add the raid1 into the raid5 - add the new drive to the raid1 - wait for resync This has just a very tiny window when the array is degraded. The bitmap allows the re-added drive to be resynced very quickly. The next step should be: - fail out the raid1 - disassemble the raid1 - re-add the new drive to the raid5 However that won't work as the superblock will be in the wrong place on the new drive. It wouldn't be hard to relocate the superblock, but there currently is no code to do this. NeilBrown - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
