HP A3550A User Manual - A3661-90001 - Page 103

Table 2-2 Single-System Distance Topology Error Recovery Failing Continue component after failure? What happens and how to recover Disk module Yes SP in single- No SP array (no high availability) SP in dual-SP disk array No on path to failed SP; Yes on alternate path through second SP Fan pack Yes Applications continue to run on all supported RAID levels (RAID-1, 1/0, 3, and 5). The system administrator or service provider hot-replaces the failed disk module. The disk array fails. The system administrator or service provider replaces the SP and the system administrator restarts the operating system and applications. Ownership of the failed SP's LUNs can transfer automatically to the remaining operational SP if primary and alternate paths have been configured in LVM. If so, LVM switches automatically and transparently to the alternate path. The system administrator or service provider hotreplaces the failed SP. Applications continue to run. The system administrator or service provider hot-replaces the fan pack. Power supply unit Yes if three power supply units; No if two power supply units (no high availability) If three power supply units are present, applications continue to run when one power supply unit fails. The system administrator or service provider hot-replaces the failed power supply unit. If two power supply units are present, the disk array fails. The system administrator or service provider replaces the failed power supply unit and the system administrator restarts the operating system and applications. HP FC-AL Hub FC I/O adapter FC cable No No on path to failed adapter; Yes if array has dual SPs and alternate paths have been configured No on path to failed cable; Yes if array has dual SPs and alternate paths have been configured No I/O operations are possible between the host and any disk arrays because all I/O traffic is routed through the HP FC-AL Hub. The authorized service provider replaces the failed HP FC-AL Hub and the system administrator restarts the operating system and applications. I/O operations fail along the path through the failed adapter. If the host has two FC adapters connected to a dual-SP disk array, the array can be accessed through the path to the operational adapter and SP if primary and alternate paths have been configured in LVM. If so, LVM switches automatically and transparently to the alternate path. The authorized service provider replaces the failed adapter and the system administrator restarts the operating system and applications. I/O operations fail along the path through the failed cable. If the host has two FC adapters connected to a dual-SP disk array, the array can be accessed through the operational path if primary and alternate paths have been configured in LVM. If so, LVM switches automatically and transparently to the alternate path. The authorized service provider hotreplaces the failed cable. Hardware Topologies Single-System Distance Topology 2-11