HP storageworks HSG80 Reference Manual page 166

CLI Command Descriptions
To enable a unit as a Host Based Volume Shadowing shadow set member, a single
controller or both controllers of a dual redundant pair must be restarted. During
the restart, the additional memory structures required for Host Based Logging are
allocated and initialized. Once enabled, the unit can only be disabled as a Host
Based Volume Shadowing shadow set member by use of the NOWRITE_LOG
command. When a unit is disabled for Host Based Logging, a restart of the
controllers is not required for the subsequent disabling action to take effect. Log
units can be JBODs, stripesets, RAIDsets, or mirrorsets. However, this unit cannot
be a member of a Snapshot, Remote Copy Set, or Partition.
When a SHOW unit-number command is entered for a given unit, one of the
following is displayed in the subsequent unit status display:
• Host Based Logging NOT Specified
Indicates that a SET unit-number WRITE_LOG command has never been
entered for the specified unit, or Host Based Logging has been disabled for a
previously enabled unit through the SET unit-number NOWRITE_LOG
command.
• Host Based Logging Specified, NOT Enabled
Indicates that a prior SET unit-number WRITE_LOG command has been
entered for the specified unit but the controller in a single controller
configuration, or both controllers in a dual redundant controller pair
configuration have not yet been restarted for Host Based Logging to become
enabled.
• Host Based Logging Specified, Enabled, NOT Active
Indicates that a prior SET unit-number WRITE_LOG command has been
entered for the specified unit and the controller in a single controller
configuration, or both controllers in a dual redundant controller pair
configuration, have been restarted to enable Host Based Logging. However,
Host Based Logging has not as yet been activated for the unit through a
specific Host initiated command to do so.
• Host Based Logging Specified, Enabled, Active
Indicates that a prior SET unit-number WRITE_LOG command has been
entered for the specified unit and the controller in a single controller
configuration, or both controllers in a dual redundant controller pair
configuration have been restarted to enable Host Based Logging, and Host
Based Logging has been activated for the unit through a specific Host initiated
command to do so.
2–150 HSG80 Array Controller V8.7 Command Line Interface Reference Guide