TRaid migration and size improvement

[yann]

Hi, I am wondering if what I want to do is possible.
I own an F4-423 NAS with formerly 2x4TB + 2x2TB HDD. There are 2 storage pools, one of 4TB and the other of 2TB. Each storage pool has only one volume of the max possible size.
Unfortunately one of the 4TB HDD broke and I replaced it with an 8TB HDD as TRaid seems to be able to maximize the max possible storage size.
As 2+2+4=8, I thought that I could go up to 8TB instead of 6Tb.

Unfortunately I discovered too late that one can only add equal or bigger HDD to a TRaid storage pool and not add gradualy any HDD.

So I'm wondering if:
1) I can reach a total 8 TB storage pool with the combination of 8TB+4TB+2x2TB
2) I can migrate my 2 TRaid storage pools (4TB + 2 TB) to a single 8TB one

My plan is now to upgrade my 2TB storage pool, but I can find out how to transfer my 4TB HDD to the 2TB one (and thus upgrading it to 4TB) without whiping out all the data.
For the moment only the 4TB volume is fille up to 3TB, althoug I can find some temp storage space (up to 1.5TB) on my PC to perform temporary storage for transfer purpose.

If someone could shed some light on whether or not what I'm tryig to achieve is possible, that would be great!

[TMzethar]

Sorry that i couldn't figure out what disks you were using for each of your two storage pools.
Please tell us the RAID type of both storage pools and their HDD members.

[yann]

Pool 1
Previously 2x4TB now 1x4TB+1x8TB in TRaid

Pool2
2x2TB in TRaid

[TMeric]

1) If you want to create a TRAID from scratch using 8T + 4T + 2T + 2T, or expand an existing 2×2T TRAID to 2T + 2T + 4T + 8T, you will indeed achieve 8T of storage capacity.

2) The TRAID type does not support changes. If you want to convert the 8TB disk to Single mode, you can remove the 8T disk while ensuring that the data on Storage Pool 1 is intact and that the 4T disk is healthy. At this point, the 4TB disk contains the same data. Use tools to delete the RAID information and partitions from the 8T disk. You can then reinsert the 8T disk into the TNAS and set it up as Single.

[yann]

If I understood correctly:
1) extract the 4TB HDD from NAS and wipe it
2) plug in 4TB HDD and upgrade pool 2 with the disk to reach 4TB on pool 2
3) migrate shared repositories and data from pool 1 to pool 2
4) extract 8TB HDD from NAS ans wipe it
5) plug in the 8TB HDD and upgrade pool 2 with it to reach 8TB

Am I correct?

[TMzethar]

Yes, these steps work despite the difference in order between 4T and 8T.