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zfs:structure:zpool

ZFS - Structure - zpool

The zpool is the uppermost ZFS structure.

  • A zpool contains one or more vdevs, each of which in turn contains one or more devices.
  • Zpools are self-contained units.
    • One physical computer may have two or more separate zpools on it, but each is entirely independent of any others.
  • Zpools cannot share vdevs with one another.

ZFS redundancy is at the vdev level, not the zpool level.

  • There is absolutely no redundancy at the zpool level.
  • If any storage vdev or SPECIAL vdev is lost, the entire zpool is lost with it!

Modern zpools can survive the loss of a CACHE or LOG vdev.

  • They may lose a small amount of dirty data, if they lose a LOG vdev during a power outage or system crash.

A zpool is not a funny-looking RAID0.

  • It is a funny-looking JBOD, with a complex distribution mechanism subject to change.
zfs/structure/zpool.txt · Last modified: 2021/10/13 00:18 by peter

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