Add more disks to the pool?

[jarlhov]

Have a setup right nor 4x4TB mirrored. Can't remember which raid I'm using at the moment. Can I ad just one more disk to the pool or do I need to ad them in pairs?

if so what's the procedure for doing this with our loosing the existing data in the pool.

 

[Tony-1971]

You must add vdevs to extend a Pool.
See https://www.ixsystems.com/documentation/freenas/11.3-RELEASE/storage.html#extending-a-pool

Best Regards,
Antonio

 

[Patrick M. Hausen]

Send us the output of zpool status ...

 

[jarlhov]

Warning: settings changed through the CLI are not written to
the configuration database and will be reset on reboot.

root@freenas:~ # zpool status
pool: NAS
state: ONLINE
status: Some supported features are not enabled on the pool. The pool can
still be used, but some features are unavailable.
action: Enable all features using 'zpool upgrade'. Once this is done,
the pool may no longer be accessible by software that does not support
the features. See zpool-features(7) for details.
scan: scrub repaired 0 in 0 days 08:22:31 with 0 errors on Sun Jan 12 08:22:32 2020
config:

NAME STATE READ WRITE CKSUM
NAS ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
gptid/dfeda3d8-ed78-11e7-a421-448a5b25667f ONLINE 0 0 0
gptid/e2674570-ed78-11e7-a421-448a5b25667f ONLINE 0 0 0
mirror-1 ONLINE 0 0 0
gptid/e38781bd-ed78-11e7-a421-448a5b25667f ONLINE 0 0 0
gptid/e50eadff-ed78-11e7-a421-448a5b25667f ONLINE 0 0 0

errors: No known data errors

pool: freenas-boot
state: ONLINE
scan: scrub repaired 0 in 0 days 00:00:06 wit

 

[Patrick M. Hausen]

So you got two mirrored pairs of disks. You should add two disks to keep the same level of redundancy.