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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.
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 ...
The ZFS filesystem was designed to immediately write data to a sector that reports as bad or takes an excessively long time to read (such as non-TLER drives); this will usually force an immediate sector remap on a weak sector in most drives. [citation needed]
Founding members of OpenZFS include Matt Ahrens, one of the main architects of ZFS. [3] In 2020, the codebases of OpenZFS and ZFS on Linux, a kernel module allowing ZFS to be used on Linux, were merged and released as OpenZFS 2.0, allowing other non-Linux operating systems to receive the various improvements that the Linux driver had ...
For example, if three drives are arranged in RAID 3, this gives an array space efficiency of 1 − 1/n = 1 − 1/3 = 2/3 ≈ 67%; thus, if each drive in this example has a capacity of 250 GB, then the array has a total capacity of 750 GB but the capacity that is usable for data storage is only 500 GB.
VTOC (Volume Table Of Contents) - Data structure on IBM mainframe direct-access storage devices (DASD) such as disk drives that provides a way of locating the data sets that reside on the DASD volume. XFS – Used on SGI IRIX and Linux systems; zFS – z/OS File System; not to be confused with other file systems named zFS or ZFS.
The features of ZFS, which is a combined file system and logical volume manager, include the verification against data corruption modes, continuous integrity checking, and automatic repair. Sun Microsystems designed ZFS from the ground up with a focus on data integrity and to protect the data on disks against issues such as disk firmware bugs ...
Yes [2] Yes [2] Yes [2] Yes [2] bioctl on NetBSD can be used for both maintenance and initialisation of hardware RAID, although initialisation (through BIOCVOLOPS ioctl) is only supported by a single driver as of 2019 — arcmsr(4) [1] [2]; software RAID is supported separately through RAIDframe [3] [4] and ZFS: The OpenBSD Project OpenBSD 4.2 ...