Dell PowerVault ME5 Series Storage System CLI Reference Guide

Shows persistent reservations for all or specified volumes. The persistent group reservations (PGR) mechanism enables application clients on multiple hosts to control access to a storage volume, and limits access by other hosts.

Each host must be registered with the storage system in order to establish a persistent reservation for a volume, thereby becoming a reservation holder.

If the system gets into an abnormal state and you need to remove all registrations and reservations for specified volumes to return them to a “clean” state, you can use the release volume command. This command must be used with care, as described in its help.

For more information about persistent reservations, see the SPC-3 specification at https://www.t10.org/.

show volume-reservations

[all|<volumes>]

Optional. Specifies all volumes, or a comma-separated list of the names or serial numbers of specific volumes. A name that includes a space must be enclosed in double quotes. If this parameter is omitted, information is shown for all volumes.

Properties are described in alphabetical order.

For an FC initiator, its WWPN. For a SAS initiator, its WWPN. For an iSCSI initiator, its node name (typically the IQN).

The reservation key, shown as a hexadecimal value.

The name of the volume.

The generation of the volume reservation, shown as a hexadecimal value.

The controller host-port identifiers.

• Write Exclusive: Write commands are only allowed for a single reservation holder.
• Exclusive Access: Certain access (read, write) commands are only allowed for a single reservation holder.
• Write Exclusive - Registrants Only: Write commands are only allowed for registered hosts. There is a single reservation holder.
• Exclusive Access - Registrants Only: Certain access (read, write) commands are only allowed for registered hosts. There is a single reservation holder.
• Write Exclusive - All Registrants: Write commands are only allowed for registered hosts. There is a single reservation holder.
• Exclusive Access - All Registrants: Certain access (read, write) commands are only allowed for registered hosts. There is a single reservation holder.
• Undefined: The volume has no persistent reservations.

The reservation scope, Logical Unit.

The serial number of the volume.

• Free: The volume is not reserved.
• Reserved: The volume has been reserved by a host.

# show volume-reservations

# show volume-reservations v1

volume-reservations

status

release volume

show volumes