You can go further and try RAID-Z3, which has a maximum of at least five disks and the ability to survive damage to up to three disks. In RAID-Z2, the maximum number of disks is at least four. This is an analogue of RAID 6 and can also withstand the collapse of as many as two disks. RAID-Z2 is more fault-tolerant, as it uses two parity blocks and two data blocks from one piece of information. It is not difficult to guess that fault tolerance will be the same i.e., there may be a possible failure of a drive. RAID-Z1 is practically an analogue of RAID 5, as it uses single parity. In this case, the data is automatically distributed across the disk in the most optimal way. RAID-Z (sometimes called RAID-Z1) will provide a record of each unique data block so that it can recover from the failure of any single disk on vdev. Three drives are usually combined into a virtual device (vdev). The minimum number of disks you can use is three. In RAID-Z, files are never divided exactly in half, but the data is treated as blocks of a fixed length. If the result of this comparison is unsatisfactory, then ZFS reads the parity information and checks which drive returned the wrong data.Īfter that, the damaged information is automatically restored and returned to the right place. When a RAID-Z block is read, the ZFS file system compares this block with the checksum. The self-healing data function is very interesting and useful.
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