Scale replacing disks for bigger ones

TrueNAS General
1

Hi,
I’ve got a single seagate 7tb disk which is almost full. I’ve bought two x 16TB ironwolf pro. I would like to do a copy of all the data from the old data to the new disk and keep that as an old offline backup.

If I go to
Storage > Manage Devices > click on sdb then replace and select one of the new disks. Will it copy all the data from the 8TB to the 16TB or does it move the data?

When its done can I then add a second disk ok to the new pool?

Sorry im new to TrueNas and cant find the answers in the forum.

2

A better way of doing this is to “extend” the existing vdev with one of the new disks turning your single drive vdev into a mirror.

Your next step is to install the second 16TB drive (into a spare bay) and (using the GUI) “replace” the 7TB with the new 16TB

End result a mirror of 16TB drives. You may need to “expand” the pool to get the 16TB space - but thats just a matter of clicking a button.

3

Agreed. Both methods will end up with a redundant pool, but your method adds redundancy sooner.

Yep–shameful of iX to kill auto-expansion.

4

Actually, this is not the preferred method to “keep that as an old offline backup”.

Making a 3 way mirror, and then running ZFS Split Mirror from the command line would accomplish that better. The old 7TB disk would then be it’s own, fully importable pool.

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