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Expanding Disk Space on raid 10
firmware 6.5.0 readynas 2120 I’m use 4---2TB drives with raid 10, total storage 4TB. I want to add more storage. I’ll either switch to raid 5 or get larger drives and stay with raid 10. I only h...
RAID6 on 4 HDDs with ARM CPU is going to be slower than RAID5. Imo, the difference of performance between RAID5 and RAID10 is not going to make any significant difference in your case. Unless you'll never use the capacity it would give you with the HDDs you have, I would pick RAID5.
Is formating a USB for BTRFS my best option for perserving the snapshots?
What about this hair-brain idea....
Since I have raid 10 with 4 disks, then 2 of the disk hold all the information (either 1&2 or 3&4). Could I pull drives 1 and 2 out, set up a new volume as raid 5 for drive 1 and 2. Then copy the 2 remaining drives from the raid 10-----drive 3 and 4 to drive 1 and 2. Next delete the raid 10 volume and then expand the raid 5 volume to a 4 disk raid?
Personally I'd just let the snapshots go. Trying to keep them makes the job a lot bigger.
FG wrote:
Is formating a USB for BTRFS my best option for perserving the snapshots?
I think so.
FG wrote:
Since I have raid 10 with 4 disks, then 2 of the disk hold all the information (either 1&2 or 3&4). Could I pull drives 1 and 2 out, set up a new volume as raid 5 for drive 1 and 2. Then copy the 2 remaining drives from the raid 10-----drive 3 and 4 to drive 1 and 2. Next delete the raid 10 volume and then expand the raid 5 volume to a 4 disk raid?
The GUI doesn't tell you how the disks are paired - I'm not sure if you'd need disk 1+2 or disk 1+3.
If one of your new disks has enough space for all the data, you could possibly remove disk-4, install a new drive there and select jbod. Copy the subvolumes over via ssh, destroy the raid-10 volume and insert remaining new disks as RAID-5. Copy the subvolumes back (again using ssh), destroy the temporary volume and remove the disk. Change back to xraid, and then re-add that disk.
I think using a USB 3.0 enclosure or SATA adapter is better though. Then you can remove all the existing disks at once, giving you an intact RAID-10 volume that you can use as a fallback if something goes wrong.
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