Warning: The Number of drives per RAID group value was adjusted to meet the requirement for the minimum number of disks per group for this type of RAID.
|Total usable storage capacity (TB):||1.00 *|
|RAID type:||RAID-Z2 (double parity with variable stripe width)|
|Number of RAID groups:||1|
|Number of drives per RAID group:||4|
|Total number of drives:||4|
|Drive capacity (GB):||500|
|Capacity of a single RAID group (GB):||1000|
|Space efficiency:||0.5 (50%)|
|Fault tolerance:||2 disk drives per RAID group|
|Minimum number of disks drives per RAID-Z2 group:||4|
|Single drive cost:|
|Cost per TB usable:|
RAID-Z is a software-based RAID implementation in the ZFS file system.
A number of disks, partitions, or even files can be grouped into a raidz group with one of the following parity protection schemas: single parity - RAID-Z1, double parity - RAID-Z2, or triple parity - RAID-Z3. One or multiple raidz groups form a zpool which is used as a storage pool for a ZFS file system. Data is striped across all raidz groups included in a zpool.
* A raidz group with N disks of size X with P parity disks can hold approximately (N-P)*X bytes. Furthermore, ZFS reserves 1/32 (3.125%) of the available zpool storage capacity. For more details see ZFS / RAIDZ Capacity Calculator