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In addition to handling whole-disk failures, RAID-Z can also detect and correct silent data corruption, offering "self-healing data": when reading a RAID-Z block, ZFS compares it against its checksum, and if the data disks did not return the right answer, ZFS reads the parity and then figures out which disk returned bad data. Then, it repairs ...
ZFS (previously Zettabyte File System) is a file system with volume management capabilities. It began as part of the Sun Microsystems Solaris operating system in 2001. Large parts of Solaris, including ZFS, were published under an open source license as OpenSolaris for around 5 years from 2005 before being placed under a closed source license when Oracle Corporation acquired Sun in 2009–2010.
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.
ZFS Pool Version Number OS Release Significant changes 29 Solaris Nevada b148 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)
mirror Yes Reed-Solomon [6] Volume [7] 2005 HDFS: Java Apache License 2.0 Java and C client, HTTP, FUSE [8] transparent master failover No Reed-Solomon [9] File [10] 2005 IPFS: Go Apache 2.0 or MIT HTTP gateway, FUSE, Go client, Javascript client, command line tool: Yes with IPFS Cluster: Replication [11] Block [12] 2015 [13] JuiceFS: Go Apache ...
[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.
File system Hard links Symbolic links Block journaling Metadata-only journaling Case-sensitive Case-preserving File Change Log XIP Resident files (inline data)
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. ( N / 2 ) ⋅ S m i n {\displaystyle (N/2)\cdot S_{\mathrm {min} }} , where N {\displaystyle N} is the total number of drives and S m i n {\displaystyle S_{\mathrm {min} }} is the ...