Move dataset from one pool to another

TrueNAS General
1

My pool-1 (2 x 4TB as mirror) is filled up to 80%.
Now I added another pool-2 (2 x 16TB as mirror).
Now I want to move my plex dataset from pool-1 to pool-2.
How can this be done easily?

2

i think the fastest way is to replicate your old dataset into the new pool (pretty easy using GUI, with a replication task), then promote the new one.
Off course, you need to remap your path everywhere you are using them

3

Possibly too late now or then perhaps not but you could have replaced your 4TB drives one at a time with your 16TB drives and pool-1 would have grown then no moving needed.

1 Like
4

…or you could add the new vdev to the existing pool.

1 Like
5

I started the replication task.
I want to use the 16TB just for the movies etc. because the drives are Seagate Exos X16 drives. I want to keep the important data on the first pool with the WD Red drives.

Adding vdev to the exiting pool gives me no control, where the data is stored.

Thanks for the answers

6

Replication task has finished and I deleted 1TB of the plex videos. Used space still stays at 80%.
Is this cause by the snapshots? Can those be deleted, or are the files on pool-2 just hardlinked to the snapshot on pool-1?

I don’t understand where the real data is.
I have a Snapshot of pool-1:

Used:
1.04 TiB
Date created:
2025-03-27 17:19:55
Referenced:
1.22 TiB
Retention:
Will not be destroyed automatically

and another one on pool-2:

Used:
336 KiB
Date created:
2025-03-27 17:19:55
Referenced:
1.22 TiB
Retention:
Will not be destroyed automatically

Will the data on the dataset on pool-2 from the replication-task stay there, when I delete those snapshots?

7

Once replicated you can safely delete the snapshots

8

Just out of curiosity: It seems that you consider WD Red a safer place than Seagate Exos. Why is that?

2 Likes
9

Just because of these messages:
https://www.heise.de/en/news/Used-Seagate-hard-disks-in-circulation-as-new-goods-10254518.html

10

Thank, now the dashboard looks better with 53% usage and not 80% anymore.

11

This is NOT a Seagate issue, it only happens that the issue was identified on Seagate drives because they provide additional report data. The scammers certainly offloaded thousands of WD/HGST drives as well, but these have never been spotted because they lack FARM to begin with.

2 Likes
12

BTW: Do you know whether or not your WD Red drives are SMR or CMR drives?

13

It’s a CMR drive: wd40efrx-68n32n0