RAID-Z1 is similar to a normal RAID-5 setup for redundancy, but with the added benefit of it being ZFS based. This means things like instant snapshotting, creating virtual block devices (for VMs or iSCSI), and all the neatness of SEND/RECV to transfer entire file systems between machines. ZFS also is one of the few file systems that not only hashes every single block on the storage device, it also VERIFIES the block against the hash tree on EVERY read operation, ensuring data integrity (instead of waiting for total failure or SMART faults)
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