Compaq Ultra SCSI Adapter Guía de usuario descargar pdf (Pagina 36)

Device Drivers for OpenVMS™

IntraServer’s OpenVMS™ driver enables the use of Ultra SCSI Differential

disks, tapes and RAID enclosures, such as Compaq’s StorageWorks line of

disk enclosures, to maximize the VAX™ system’s I/O throughput and

storage capacity. IntraServer’s OpenVMS™ drivers are optimized for

minimum load on the system processor(s) by use of a loadable SCRIPT to

handle low level SCSI operations and minimize the number of interrupt

requests to the system. For the case of small I/Os, IntraServer’s OpenVMS™

driver will only interrupt the host once for each I/O, compared with several

interrupts per I/O for other SCSI adapters. IntraServer’s Ultra SCSI

OpenVMS™ drivers also feature:

IntraServer’s Digital OpenVMS™-VAX™

driver features:

•

Supports Ultra SCSI at speeds up to 40MBytes/Sec per channel (Ultra-

SCSI peak synchronous rate. Your system will be limited to the

system’s bus bandwidth, which can be below this peak rate)

•

Supports over 5000 single block I/Os per second per channel

•

Supports synchronous negotiation (including Fast/Ultra SCSI)

•

Minimum interrupt per I/O script technology for maximum I/O

throughput with minimum CPU overhead

•

Supports up to 7 disks per channel

•

vmsinstal.com support for simple installation

•

Supports wide negotiation

•

Supports tagged command queuing

•

Supports multiple Logical Unit Numbers (LUNs)

•

Supports Disconnect/Reselect

• Supports differential SCSI

• Supports Host Based Shadowing

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Compaq Ultra SCSI Adapter Guía de usuario Pagina 36