Once it integrates, you will be able to run zpool remove on any top-level vdev, which will migrate its storage to a different device in the pool and add indirect mappings from the old location to the new one. It's not great if the vdev you're removing is already very full of data (because then accesses to any of that data have to go through the indirect mappings), but it is designed to work great for the use case you're talking about (misconfiguration that you noticed very quickly). Jun 06, 2006 · To remove a hot spare from a pool, simply use the zpool remove command. For example: # zpool remove test c0t2d0 # zpool status pool: test state: ONLINE scrub: resilver completed with 0 errors on Tue Jun 6 08:51:49 2006 config: NAME STATE READ WRITE CKSUM test ONLINE 0 0 0 mirror ONLINE 0 0 0 c0t3d0 ONLINE 0 0 0 c0t1d0 ONLINE 0 0 0 errors: No ... Devices that are part of the main mirrored pool configuration can be removed by using the zpool detach command. Nonredundant and RAID-Z devices cannot be removed from a pool. For more information about using cache devices in a ZFS storage pool, see Creating a ZFS Storage Pool With Cache Devices. In fact, I fixed this pool a few days ago by rebooting the machine from a pendrive with FreeNAS 11.1U4 (which is based on FreeBSD 11.1-STABLE), importing the pool, and removing the device using the exact same zpool remove command that was being silently ignored by ZoL. Exported the pool and rebooted the machine into Linux+ZoL, imported it and ... Pools are destroyed by using the zpool destroy command. This command destroys the pool even if it contains mounted datasets. This command destroys the pool even if it contains mounted datasets. # zpool destroy tank Jul 27, 2013 · Oracle recommends to spread the zpool across the multiple disks to get the better performance and also its better to maintain the zpool under 80% usage.If the zpool usage exceed more than 80% ,then you can see the performance degradation on that zpool. To accelerate the ZPOOL performance ,ZFS also provide options like log devices and cache devices.