IBM 5908 SAS 3Gb 3-Port PCI-X DDR 1.5GB Cache RAID Adapter
PCI-X DDR 1.5 GB cache SAS RAID Adapter (FC 5908; CCIN 575C)
Learn about the specifications and operating system requirements for the feature code (FC) 5908 adapter.
Overview
The PCI-X DDR 1.5 GB cache SAS RAID Adapter is a SAS disk controller with a maximum of 1.5 GB compressed write cache and a maximum 1.6 GB compressed read cache. Auxiliary write cache and concurrent battery maintenance are provided. The controller is implemented using two physical adapters that are securely connected to form a double-wide adapter. The double-wide adapter requires two adjacent Peripheral Component Interconnect-X (PCI-X) slots. The auxiliary write cache side of the double-wide adapter contains a dual, concurrently maintainable cache battery pack which maintains cache memory on both adapters in the event of an abnormal termination.
When used in a logical partition (LPAR) environment, this double-wide adapter must have both slots of the adapter assigned to the same logical partition. When implementing dynamic LPAR (DLPAR), both slots of the adapter must be managed together. Feature 5908 indicates a gen-3 blind swap cassette. This feature is used in the 5790 and 5796.
575C is the CCIN number on the write-cache adapter.
The adapter provides RAID 0, RAID 5, RAID 6, and RAID 10 fortheAIX®andLinuxoperating systems.Under theIBM® ioperating system, mirroring and data spreading are provided by the operating system, and RAID 5 and RAID 6 are provided by the adapter.1
The adapter provides three mini-SAS 4x connectors for the attachment of SAS drives located in 5886 EXP 12S Expansion Drawers. The adapter supports a maximum of five 5886 EXP 12S Expansion Drawers.1With proper cabling and configuration, multiple wide ports are used to provide redundant paths to each dual port SAS drive. The adapter manages SAS path redundancy and path switching should a SAS failure occur.
This adapter supports the multi-initiator and high availability configurations. With the optional pairing of adapter sets, an even higher level of protection is provided by using a dual controller I/O configuration1to protect against the failure of an entire adapter set. In such a high availability I/O configuration, SAS X cables are used to attach 5586 EXP 12S Expansion Drawers, and the fourth (top) mini-SAS connector on each card set is used to directly connect the card sets by using a SAS AA cable.
