OpenVMS Cluster Systems - OpenVMS Systems - HP

OpenVMS Cluster Concepts
2.8 Disk Availability
2.8.3 Enabling the MSCP Server
The MSCP server is controlled by the MSCP_LOAD and MSCP_SERVE_ALL
system parameters. The values of these parameters are set initially by answers
to questions asked during the OpenVMS installation procedure (described in
Section 8.4), or during the CLUSTER_CONFIG.COM procedure (described in
Chapter 8).
The default values for these parameters are as follows:
• MSCP is not loaded on satellites.
• MSCP is loaded on boot server and disk server nodes.
Reference: See Section 6.3 for more information about setting system
parameters for MSCP serving.
2.9 Tape Availability
Locally connected tapes can be served across an OpenVMS Cluster by the TMSCP
server.
2.9.1 TMSCP Server
The TMSCP server makes locally connected tapes, including the following,
available across the cluster:
• HSC and HSJ tapes
• ISE and HSD tapes
• SCSI tapes
The TMSCP server implements the TMSCP protocol, which is used to
communicate with a controller for TMSCP tapes. In conjunction with the tape
class driver (TUDRIVER), the TMSCP protocol is implemented on a processor,
allowing the processor to function as a storage controller.
The processor submits I/O requests to locally accessed tapes, and accepts the I/O
requests from any node in the cluster. In this way, the TMSCP server makes
locally connected tapes available to all nodes in the cluster. The TMSCP server
can also make HSC tapes and DSSI ISE tapes accessible to OpenVMS Cluster
satellites.
2.9.2 Enabling the TMSCP Server
The TMSCP server is controlled by the TMSCP_LOAD system parameter. The
value of this parameter is set initially by answers to questions asked during
the OpenVMS installation procedure (described in Section 4.2.3) or during the
CLUSTER_CONFIG.COM procedure (described in Section 8.4). By default, the
setting of the TMSCP_LOAD parameter does not load the TMSCP server and
does not serve any tapes.
2.10 Queue Availability
The distributed job controller makes queues available across the cluster in
order to achieve the following:
2–16 OpenVMS Cluster Concepts