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ZFS is a 128-bit file system, [44] [16] so it can address 1.84 × 10 19 times more data than 64-bit systems such as Btrfs. The maximum limits of ZFS are designed to be so large that they should never be encountered in practice. For instance, fully populating a single zpool with 2 128 bits of data would require 3×10 24 TB hard disk drives. [45]
[1] [2] Additionally, file systems like Btrfs or ZFS provide integrated data mirroring. [3] [4] There are additional benefits from Btrfs and ZFS, which maintain both data and metadata integrity checksums, making themselves capable of detecting bad copies of blocks, and using mirrored data to pull up data from correct blocks. [5]
Diagram of a RAID 1 setup. RAID 1 consists of an exact copy (or mirror) of a set of data on two or more disks; a classic RAID 1 mirrored pair contains two disks.This configuration offers no parity, striping, or spanning of disk space across multiple disks, since the data is mirrored on all disks belonging to the array, and the array can only be as big as the smallest member disk.
Some filesystems, such as Btrfs, [32] and ZFS/OpenZFS (with per-dataset copies=1|2|3 property), [33] support creating multiple copies of the same data on a single drive or disks pool, protecting from individual bad sectors, but not from large numbers of bad sectors or complete drive failure. This allows some of the benefits of RAID on computers ...
RAID-Z/mirror hybrid allocator 30 Solaris Nevada b149 ZFS encryption 31 Solaris Nevada b150 Improved 'zfs list' performance 32 Solaris Nevada b151 One MB block support 33 Solaris Nevada b163 Improved share support 34 Solaris 11.1 (0.5.11-0.175.1.0.0.24.2) Sharing with inheritance 35 Solaris 11.2 (0.5.11-0.175.2.0.0.42.0) Sequential resilver 36
For example, a filesystem spanning two 500 GB devices and one 1 TB device could provide RAID1 for all data, while a filesystem spanning a 1 TB device and a single 500 GB device could only provide RAID1 for 500 GB of data. The ZFS filesystem can likewise pool multiple devices of different sizes and implement RAID, though it is less flexible ...
RAID 01, also called RAID 0+1, is a RAID level using a mirror of stripes, achieving both replication and sharing of data between disks. [3] The usable capacity of a RAID 01 array is the same as in a RAID 1 array made of the same drives, in which one half of the drives is used to mirror the other half.
In some RAID configurations, such as RAID 0, failure of a single member drive of the RAID array causes all stored data to be lost. In other RAID configurations, such as a RAID 5 that contains distributed parity and provides redundancy , if one member drive fails the data can be restored using the other drives in the array.