IBM RELEASE 7.3 - Manual (Page 118)

• Support Shelf Tape. If ON, the PVR and the PVL will support the removal of cartridges
from the tape library using the shelf_tape utility.
Command Device. The name of the device that the PVR can use to send commands to the robot. For
AIX systems, this is generally /dev/smc0. For Linux systems, use the symbolic library name defined in
/etc/ibmatl.conf.
5.1.1.1.1. LTO PVR Additional Information
The LTO PVR must run on the same node that has the Atape interface and this node must have a direct
SCSI connection to the library. Please note that the control channel for the library is shared with the data
path for the first drive in the library over the same SCSI interface.
The 3584 Library can be partitioned into multiple logical libraries which can each be controlled by a
separate PVR. This is useful if you have a large library, since you can allocate a set of tapes to a specific
set of drives under a logical library.
While HPSS can theoretically share an IBM robot with other tape management systems, this is not
recommended. If a robot is shared, care must be taken to ensure that a drive is not used by any other tape
management system while that drive is unlocked in HPSS. This is important because HPSS periodically
polls all of its unlocked drives even if they are not currently mounted. The SMC device special file is not
available to other tape management programs. Additional device special files may be created for other
programs.
The LTO PVR requires an SMC device special file to access the robot. For AIX systems, this file is
usually named /dev/smc0 and can be created using the System Management Interface Tool (SMIT) or
cfgmgr.
5.1.1.2. SCSI PVR Specific Configuration Window
Field Descriptions
Cartridge Capacity. The total number of cartridge slots in the library dedicated to this HPSS PVR.
This may or may not be the total cartridge capacity of the library; a site might use part of the library for
some other HPSS PVR or for some non-HPSS application. The PVR uses the Cartridge Capacity field
and the Cartridge Alarm Threshold field to determine when to send an alarm that the total cartridge
threshold has been exceeded.
Cartridge Alarm Threshold. The percentage of the Cartridge Capacity at which the PVR will send an
alarm.
Same Job on Controller, Other Job on Controller, & Distance To Drive. These values are used by the
PVR when selecting a drive for a tape mount operation. The three values are essentially weights that are
used to compute an overall score for each possible drive. After the score has been calculated, the drive
with the lowest score is selected for the mount. If two or more drives tie for the lowest score, one drive is
selected at random. The score is calculated as follows:
HPSS Management Guide November 2009
Release 7.3 (Revision 1.0) 118