Transfer data to new HDDs

[c00ler]

Currently i have all my data, network shares and apps in 1 pool - 2x1TB HDDs in stripe (i know stripe is bad). I’ve bought 4 4TB HDDs and want to use it in Raidz1 configuration. I need to transfer all my data, apps, shares etc to new pool (old HDDs will be removed from system). Is there some easy way to do that so i will not need to reconfigure my shares and apps?

[Arwen]

Sort of. It is mostly command line. Assuming you have 4 additional SATA ports and 4 HDD power ports, you can make the new pool with the GUI. Next, simply clone your old pool to the new using ZFS Send & Receive. Then export the old pool from the GUI, and remove it’s disks. Export the new pool, and re-import with the old pool’s name. Export again from the command line. Then re-import from the GUI.

Lots of people want data migration like this, so their may be other forum threads on the subject. Unfortunately I don’t have the details handy.

[c00ler]

I am confused about last two steps. Why i need export and reimport new pool again after i’ve already reimported it with old pool’s name?

[NugentS]

Because you need to run both pools at the same time (briefly) and cannot have two pools with the same name

[Arwen]

@c00ler

Why i need export and reimport new pool again after i’ve already reimported it with old pool’s name?

The middleware GUI won’t know about the pool import with the old name, because the ZFS command line work is done outside of it’s control.

[etorix]

HOWTO: Rename a ZFS pool

The basic process to rename a ZFS pool is to export it from the GUI, import it in the CLI with the new name, then export it again, and re-import it in the GUI. I find I normally want to do this after creating a new pool (with perhaps a different set of disks/layout), replicating my old pool to the new pool, and then I want to rename the new pool to the same as the old pool, and then all the shares work correctly, and its fairly transparent. Mostly. (tested with TrueNAS CORE 12U8-1. Works with …

0. (initial state) oldpool
1. Create “newpool”.
2. Replicate data from oldpool to newpool.
3. Export oldpool, and remove the drives.
4. In CLI zpool import newpool oldpool
5. In CLI zpool export oldpool
6. Import from GUI. From then on, the new pool should go by the name “oldpool”.

[c00ler]

@etorix

Replicate data from oldpool to newpool.

I have a problem witg this step. I’ve ctreated a replication task, it says “success” but it also says “No snapshots sent yet”. And there is no new data on new pool

[etorix]

Replication works on snapshots; ideally, you’d use the periodic snapshots you have defined for backups… (You have backups, right?)

So let’s review your snapshot settings, and replication settings.

[c00ler]

Ok, i managed to replicate old pool to a new one. But now i have a problem in CLI: zpool command not found

Probably this is because i am using TrueNAS Scale. Any solution? Different command?

[NugentS]

try “sudo zpool”

[c00ler]

zpool wouldn’t work in Truesnas shell but it worked in Linux shell. I’ve got my data in new poll and network shares are working as before, but apps are gone and i have this errors