Hi all, I currently have an almost full RAID 5 built with 4 x 2 TB disks. I wonder if it would be possible to migrate it to a bigger RAID 5 with 3 x 6TB new disks. I've imagined something like that : - successively fail, remove a 2TB disk, add a 4TB disk, wait for end of recovery on three 2TB disks - at the end of this first phase, I have the same ~6TB RAID 5 clean group with 3 x 4TB + 1 x 2TB disks - declare the last 2 TB disk faulty and remove it - the RAID 5 group state goes to clean, degraded - grow the RAID 5 group with --size=max option - grow the RAID 5 group with --array-size=~12TB option - last, grow the RAID 5 group with --raid-devices=3 and --backup-file=... options. And I have tested it on a small test RAID 5 group. As expected, this last command makes the RAID 5 group begins a reshaping operation. But this one keeps stucked at zero. So I have several questions : - is it even theorically possible to grow a RAID 5 while decreasing the number of disks ? - do you think the sequence i've imagined is correct ? - why the reshaping operation does it stuck at zero ? Any help or hint would be greatly appreciated :) Thanks Regards Pierre -- 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
