How to move old backup to a new special device

[Ting]

Hi,

I setup a new ssd as a special device to my backup server storage pool, and I had some old backup on the storage pool (all spin disks before), how to rewrite these old backup and so new meta data can be written onto that ssd special device?

thanks in advance.

 

[mariol]

If backups are rewritten, this is done for new backups. If you want to rewrite the existing pool, you have to copy it to another location (same pool if enough space is available) and then copy it back again if the target is an other host. For example a local copy:

zfs snapshot <pool>/backup_data@snap_for_rewrite
zfs send -v <some-pool>/backup_data@snap_for_rewrite | zfs receive <some-pool>/targetdataset

You can find some examples also here.