may result in a large performance degradation. For SAN disk devices, the hpss_san3p_part utility with
the -i option and device name must be run to assign a UUID to the disk device. This UUID should be
used in the Device Name field when configuring the disk device.
Currently the number of drives which may be configured per PVR is limited to 256. The current
maximum number of PVR's is 64. The maximum number of devices per mover is also 64. Given these
limits, the total number of tape drives allowed in the system is 16,384.
Devices and drives are added dynamically. This means that they must be added while the system is UP.
Specifically the PVL must be UP; additionally it is expected that the associate d Mover and associated
PVR (for tape) are also UP. A new device/drive cannot be used until the PVL has successful ly notified
the associated Mover and PVR (for tape) about the new device/drive. If the PVL is unable to successfully
notify the associated Mover and/or PVR about the new device/drive, it will retry several times; each
failure will be logged as an ALARM. After the last failed attempt to notify the assoc iated Mover and/or
PVR, the PVL will abandon retrying; the administrator is advised to bounce the abandoned associated
Mover (if it was UP during the failed retries) and/or to reinitialize the abandoned associated PVR (if it
was UP during the failed retries) before the device/drive can be used.
Likewise, a previously deleted device/drive cannot be added back until the PVL has successfull y notified
the associated Mover and PVR (for tape) about the previous delete. If the administrator attempts to add a
device/drive with a previously deleted Drive ID that is still pending delete notification, the administrator
will get a BUSY failure and the pending notification will be aborted. An ALARM will be logged
informing the administrator that the create failed since the the Mover/PVR notification pends and another
ALARM will be logged informing the administrator that the previous drive delete notification will be
aborted and to try later; wait a minute or so before retrying in order to give the PVL time t o abort the
notification. The Drive Flag field in the Devices and Drives window and PVL Drive Information
window will report whether or not a particular drive is pending Mover/PVR notificat ion; of course, this
is only viewable while the drive exists.
At this point, the Administrative State of the drive must be unlocked before it is availabl e. Refer to
Section 7.4.1: Unlocking a Drive on page 220.
Disk Device Configu rationTape Device Config urationHPSS Management Guide November 2009
Release 7.3 (Revision 1.0) 197