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Pro 6 running OS4 - Convert RAID5 to RAID6
My Pro 6 held 5 drives (2TB, 3TB, and 3x4TB) in a single-redundant array (3 layers: 8TB, 3TB, and 2TB). I added a 6th drive (4TB) and chose to use it for dual-redundancy rather than increased capaci...
- Generally you'd do the conversion to RAID-6 with a single layer array
- That should work. Check to make sure the partitions are all the same size for the devices in that layer and the SMART stats of the disks first. Is your backup up to date? If not, you may also wish to update that.
- No. This is mdadm and that's the command to use. Note: you shouldn't try shrinking a layer as that would lead to data loss.
- Generally you'd do the conversion to RAID-6 with a single layer array
- That should work. Check to make sure the partitions are all the same size for the devices in that layer and the SMART stats of the disks first. Is your backup up to date? If not, you may also wish to update that.
- No. This is mdadm and that's the command to use. Note: you shouldn't try shrinking a layer as that would lead to data loss.
mdgm wrote:
Generally you'd do the conversion to RAID-6 with a single layer arrayYeah. But unfortunately I already had 3 layers, and I figured it'd be safest to upgrade to dual-redundancy first, before I put this large array through the stress of two expansions.
That should work. Check to make sure the partitions are all the same size for the devices in that layer and the SMART stats of the disks first. Is your backup up to date? If not, you may also wish to update that.Thanks! Disks are healthy and my backup is current. The relevant artitions are equal-sized:
NAS1:~# cat /proc/partitions | grep sd.5 8 5 976751999 sda5 8 53 976751999 sdd5 8 69 976751999 sde5 8 85 976751999 sdf5 NAS1:~# cat /proc/partitions | grep sd.4 8 4 976751979 sda4 8 36 976751979 sdc4 8 52 976751979 sdd4 8 68 976751979 sde4 8 84 976751979 sdf4
I'm starting the process now. I'll post again when it's done.
Oh, and I just noticed an error in my original post (the --raid-devices parameters were wrong.) The commands should have been:
mdadm --grow /dev/md3 --level=6 --raid-devices=5 --backup-file=/root/md3backup mdadm --grow /dev/md4 --level=6 --raid-devices=4 --backup-file=/root/md4backup
Ah, yes.
Always pays to double check commands like this before entering them.
Thanks again, mdgm. The NAS just finished restriping the final layer. Now the whole array is RAID6 and I feel a lot more confident that it'll survive the upcoming expansions from 11TB to 13TB and then to 16TB.
.... from 11TB to 13TB and then to 16TB.I mean, from 13TB to 14TB and then to 16TB.
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