Extending existing ZFS Pool by replacing existing drives with larger ones

[mhenley]

I am confused with the FreeNAS documentation. I am sure this has been answered but I didn't find a straight forward response in my searches.

Years ago I created a ZFS RaidZ2 Pool with 6 x 2 TB drives. Typically I am seeing one drive failure per year and replace it with no issues. Last year, I started buying 4 TB drives and replacing failed drives with those. Now I have a pool with 4 x 2 TB drives and 2 x 4 TB drives. When all drives are replaced with 4 TB drives, will the pool size increase or will i have to delete the pool and start over to utilize the larger drives?

 

[cobrakiller58]

If zpool get autoexpand yourpoolname says auto expand is on then in theory it should use all available space once the last drive has been added. I think there was a case or two that it did not but it was fixed with destroying the pool.