Chapter 8. Advanced host and volume administration 423
– Capacity: Shows the capacity of the volume. If the volume is thin-provisioned, this
number is the virtual capacity.
– UID: The volume unique identifier.
– Number of FlashCopy mappings: The number of existing FlashCopy relationships. For
more information, see Chapter 10, “Copy services” on page 485.
– Caching I/O group: Specifies the volume caching I/O group.
– Accessible I/O groups: Shows the I/O group that the host can use to access the
volume.
– Preferred node: Specifies the ID of the preferred node for the volume.
– Encrypted: Shows whether the volume is encrypted.
– I/O throttling: You can set a limit on the number of I/O operations that are accepted for
a volume. The limit is set in terms of I/O operations per second (IOPS) or bandwidth.
For more details on I/O throttling, 6.10, “I/O throttling” on page 343.
– Mirror sync rate: After creation, or if a volume copy is offline, the mirror sync rate
weights the synchronization process. Volumes with a high sync rate (100%) complete
the synchronization faster than volumes with a lower priority. By default, the rate is set
to 50% for all volumes.
– Cache mode: Shows whether the cache is enabled or disabled for this volume.
– Cache state: Indicates whether open I/O requests are in the cache that is not destaged
to the disks.
– ID: Shows the identifier (ID) of the volume.
– UDID (OpenVMS): The unit device identifiers (UDIDs) are used by OpenVMS hosts to
access the volume.
– Virtualization type: Specifies the virtualization type of the volume. The value can be
striped, seq, image, or many. The value “many” indicates that the volume has multiple
copies, which can have different virtualization types.
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