System information

HSD10 Operation
VAX 4000 Model 108 User Information
4-3
One or more HSD10 DSSI-to-SCSI bus adapters can be connected on the DSSI bus
containing RF-series or TF-series drives, host nodes, or other DSSI-compliant nodes (up to
eight nodes maximum).
HSD10 DSSI-to-SCSI Bus Adapter Features and Capabilities
The HSD10 DSSI-to-SCSI bus adapter provides the following features.
• Support for OpenVMS VAX systems
• Multihost support for up to three host DSSI nodes in a cluster environment
• User-selectable SCSI and DSSI node IDs
• DUP support for modifying operating parameters, such as DSSI nodename and device
allocation classes
• Controller-based Redundant Array of Independent Disks (RAID) 0 capability
(striping)
• Host-based striping
• Host-based volume shadowing (with some restrictions)
• Virtual drive partitioning support
• Serial communications port which allows connection to an external console for use by
Digital services which permits upgrades to functional firmware
• Supports a total DSSI cable length of up to 18.3 meters (60 feet)
The HSD10 DSSI-to-SCSI bus adapter also exhibits the following performance metrics:
• 500+ requests/second (aggregate)
• 1.7 MB/second sustained throughput (aggregate)
• Each device served by the HSD10 DSSI-to-SCSI bus adapter is independently
addressable. Attached disk and tape drives appear to the host as standard DIGITAL
storage architecture (DSA) devices. Disk allocation class is user-definable, with all
attached disks sharing the class value. Tape allocation class is independently user-
definable in the same manner.
The HSD10 DSSI-to-SCSI bus adapter identifies itself as a node on the DSSI bus. The
HSD10 DSSI-to-SCSI bus adapter identifies attached disk devices as RF72 or RA82 disk