HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software Command Line Interface Reference Guide (EK-G80CL-RA. C01, March 2005)

CLI Command Descriptions
238 HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software
Command Line Interface Reference Guide
Host systems (such as Tru64 UNIX, V5.x) implementing persistent
reservations assume that persistent reservations are never lost under any
condition. Changing the mirrored cache setting causes persistent reservations
to be lost by the controller because the controller reformats cache memory
data structures where persistent reservation data for units reside. Tru64 UNIX
re-establishes persistent reservations from the host master persistent
reservation database.
For additional information, see MIRRORED_CACHE and
NOMIRRORED_CACHE switch descriptions under the SET controller
command on page 184.
HOST_REDUNDANT
NOHOST_REDUNDANT (default)
Modifies error handling for designated units so that the controller does not
perform extensive errory recovery operations after receiving repeated Not
Ready messages. The host is signalled with a Unit Attention and ASC
and ASCQ of 04_03, signifying that manual invention is required.
Note: This switch is especially pertinent for Tru64 UNIX, V5. x platforms. With Tru64
UNIX platforms using V5.
x , ACS signals Logical Storage Manager (LSM) to disengage
a unit from the host mirroring and to return the I/O to a good, redundant member.
■ Specify HOST_REDUNDANT to turn on the capability to signal a host to
move to the redundant unit copy for the original requested unit data if the
controller is unable to submit data from the original unit to the host.
■ Specify NOHOST_REDUNDANT to turn off the capability to signal a host
to move to the redundant unit copy for the original requested unit data if
the controller is unable to submit data from the original unit to the host.
Note: These switches cannot be used on units that are part of partitioned containers.