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Pool states

The pool state reflects the way it behaves in regard to the pool physical capacity. The pool may have either of the following states:

  • Normal
    • The pool entities serve read and write requests
    • Snapshots and clones can be created
    • The pool physical allocated capacity is smaller than the pool allocated physical capacity
    • The emergency buffer is not in use
  • Limited
    • The pool entities serve read and write requests
    • Snapshots and clones cannot be created
    • The pool physical allocated capacity is smaller than the sum of pool allocated physical capacity and emergency buffer
    • The emergency buffer is in use
  • Locked
    • The pool entities serve read requests
    • The pool entities do not serve write requests
    • Snapshots and clones cannot be created
    • The pool physical allocated capacity equals to the sum of pool allocated physical capacity and emergency buffer
    • The emergency buffer is in use

The transition of the pool from state to state depends on the emergency buffer setting, as described above.

Pool states in case of an unlimited emergency buffer

An unlimited buffer means that the pool may exceed it physical capacity freely (up to the system physical capacity).

  • As long as the pool used physical capacity does not exceed the pool total physical capacity, the pool state is Normal
  • When the pool used physical capacity exceeds the pool total physical capacity, and is using the emergency buffer, the pool state is Limited.
  • The pool state remains Limited even when the emergency buffer is fully used

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