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Chapter 2 HPSS Planning
HPSS Installation Guide September 2002 71
Release 4.5, Revision 2
might be necessary by making requests to the appropriate Physical Volume Repository (PVR). The
PVL communicates directly with HPSS Movers in order to verify media labels.
The PVL is not required to be co-resident with any other HPSS servers and is not a CPU-intensive
server. With its primary duties being queuing, managing requests, and association of physical
volumes with PVRs, the PVL should not add appreciable load to the system.
In the current HPSS release, only one PVL will be supported.
2.6.9 PVR
The PVR manages a set of imported cartridges, mounts and dismounts them when requested by
the PVL. It is possible for multiple HPSS PVRs to manage a single robot. This is done if it is
necessary to partition the tape drives in therobot into pools. Each tape drive in the robot is assigned
to exactly one PVR. The PVRs can be configured identically and can communicate with the robot
through the same interface.
The following sections describe the considerations for the various types of PVRs supported by
HPSS.
2.6.9.1 STK PVR and STK RAIT PVR
The STK RAIT PVR cannot be supported at this time since STK has not yet made RAIT
generally available.
The STK PVR and STK RAIT PVR communicate to the ACSLS server via STK’s SSI software.
The SSI must be started before the PVR. If the SSI is started after the PVR, the PVR should be
stopped and restarted.
If multiple STK robots are managed, SSIs that communicates with each of the robots should be
configured on separate CPUs. A PVR can be configured on each of the CPUs that is running an SSI.
If multiple STK robots are connected and are controlled by a single Library Management Unit
(LMU), a single PVR can manage the collection of robots. The PVR can be configured on any CPU
that is running an SSI.
HPSS supports the device virtualization feature of theStorageTek StorageNet 6000 series ofdomain
managers. This feature allows for the ability to configure a Redundant Arrays of Independent
Tapes (RAIT) as an HPSS device. This capability is enabled by configuring an STK RAIT PVR for
each RAIT physical drive pool. The number of physical drives to be used by HPSS is set in the RAIT
PVR specific configuration, and used by the PVL when scheduling mounts of RAIT virtual
volumes. HPSS supports the following striping/parity combinations for both the 9840 and 9940
virtual drives: 1+0, 2+1, 4+1, 4+2, 6+1, 6+2, 8+1, 8+2, and 8+4.