HP High Availability FC Disk Array 30/FC User Guide - Page 100

Disk Array Configurations Configuration type Basic One host One SCSI-2 adapter One SCSI-2 bus One SP Two-SP One host One SCSI-2 adapter One SCSI-2 bus Two SPs Multi-bus (HP-UX 10.x and later) Two hosts Two SCSI-2 adapters (one per host) Two SCSI-2 buses (one per host) Two SPs Features Applications can continue to run after the failure of a single disk module within a physical disk unit (LUN). Applications cannot continue to run if an SP, SCSI-2 adapter or external SCSI-2 bus fails. Provides the same features as the basic configuration, but with better performance and higher availability. Applications can continue to run if a single disk module fails. With HP-UX 10.x, if one SP fails, ownership of the failed SP's LUNs can automatically transfer to the remaining operational SP. If properly configured, these operations are transparent to the user. Auto-trespass is not available on HP-UX 9.05/9.07. If the SCSI-2 adapter or external SCSI-2 bus fails, no I/O operations are possible between the host and the array. Resembles two basic configurations side-by-side and provides modest high availability with the external SCSI-2 buses not shared between two hosts. Applications can continue to run if a disk module fails. If a host adapter fails, the adapter on the other host can only access its own LUNs. The System Administrator must manually change the path and SP ownership of the LUNs for the failed SP or failed host adapter by using Grid Manager. No automatic transfer of LUN ownership or path takes place for this configuration type. 3-5 Configuration, HP 9000 Series 700