HP High Availability FC Disk Array 30/FC User Guide - Page 110

Configuration, HP 9000 Series 800 Two-adapter/Two SP One host Two SCSI-2 adapters Two SCSI-2 buses Two SPs Multi-bus Two hosts Two SCSI-2 adapters (one per host) Two SCSI-2 buses (one per host) Two SPs Provides highest availability and best array performance for singlehost configurations. Applications can continue to run after failure of a disk module. HP-UX 9.04 If one SP fails, the System Administrator must reassign ownership of the failed SP's LUNs to the operational SP by using Grid Manager. Also, the path to the operational SP must be used and can be changed by way of LVM. Once these changes have been made, access to all LUNs on the array is possible. If the SCSI-2 adapter fails, the System Administrator can access the array through the operational SCSI-2 adapter's path. LUN ownership and path changes need to be reassigned by using Grid Manager and LVM, respectively. HP-UX 10.x If one SP fails, ownership of the failed SP's LUNs can transfer automatically to the remaining operational SP. If a primary and an alternate path have been configured in LVM, LVM switches automatically to the alternate path. If the SCSI-2 adapter fails, transfer of LUN ownership and the LVM switch to the alternate path take place automatically. These operations are transparent to the user. Resembles two basic configurations side-by-side, and provides modest high availability with the external SCSI-2 bus not shared between two hosts. Applications can continue to run after a disk module failure. HP-UX 9.04 There is no automatic transfer of LUN ownership or path for this configuration type. HP-UX 10.x If one SP fails, the System Administrator can access the LUNs owned by the failed SP by accessing the remaining operational SP with the other host. If a host adapter fails, the System Administrator can access the LUNs in the array with the other host adapter. The System Administrator must change the path and the SP ownership of the LUNs for the failed SP or failed host adapter by using LVM and Grid Manager, respectively. 4-3