I'm running FreeNAS on a Mini-ITX Box at home. I have 3x3TB HDDs in a RAIDZ1 udev. Now I'm running out of space. I have space for one additional HDD in my case. I want to convert the 3x3TB RAIDZ1 into a 4x3TB RAIDZ1.
Can I do that without sending a snapshot to some other disk, then completely rebuild the vdev/zpool and restoring the snapshot? Are there any other options I am missing?