ZFS
ZFS (Zettabyte File System) -
is a proprietary filesystem originally designed by SUN Microsystems and then moved to the OpenZFS project.
Zpool
ZFS storage pool -
a set of disks combined into a pool on which ZFS filesystem hosted.
Disks of any size and characteristics are easily include into a ZFS-based storage device and all the space is available to all the volumes.
ZFS RAIDz
ZFS RAIDz -
a technology of combining disks into a single storage allowing to survive a single disk failure, based on the ZFS capability.
Similar to a regular RAID5;
however, the details of implementation differ much especially in varying number of RAID columns and sizes.
Can be used either 2-column mirror layout or N-column (N>2) RAID5 with untypical parity block placement.
ZFS RAIDz2
ZFS RAIDz2 -
a technology of combining disks into a single storage allowing to survive a double disk failure, based on the ZFS capability.
Similar to a regular RAID6;
however, the details of implementation differ much especially in varying number of RAID columns and sizes.
Can be used either 3-column mirror layout or N-column RAID6 (N>3) with untypical parity block placement.
ZFS RAIDz3
ZFS RAIDz3 -
a technology of combining disks into a single storage allowing to survive a triple disk failure, based on the ZFS capability.
Can be used either 4-column mirror layout or RAID with 3 different parity functions.
ZFS dataset
In ZFS filesystem, ZFS dataset means a set of blocks of disk space from the ZFS pool which make up volumes, snapshots, and clones.
ZFS dnode
ZFS dnode is a metadata object which ZFS filesystem operates with.
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