IBM Power System Series Manual page 22

Figure 6. Disk bays controlled by both SAS adapters when using a SAS dual-RAID subsystem with internal drives
Table 7 lists the configuration details.
Table 7. Configuration details
Embedded SAS
Embedded storage controller (Un-P1-T9)
Cache battery card (Un-P1-C14) (CCIN 2BCF)
RAID and cache storage controller (Un-P1-C19,
Un-P1-C19-E1) (CCIN 2B4C)
Related concepts:
"SAS dual-RAID subsystem with external drives for the 8202-E4C, 8202-E4D, 8205-E6C, or 8205-E6D" on
page 11
This configuration increases availability by using dual-storage I/O adapter (IOA) mode or high
availability (HA) RAID mode to connect multiple adapters to a common set of internal and external disk
drives.
"SAS subsystem service considerations for the 8202-E4C, 8202-E4D, 8205-E6C, or 8205-E6D" on page 13
Review several considerations before servicing features within the SAS subsystem for the 8202-E4C,
8202-E4D, 8205-E6C, or 8205-E6D system.
"Service considerations for the cache battery pack" on page 14
To prevent data loss, follow the procedures before replacing the cache battery pack on the cache RAID
cards.
10
SAS subsystem
Configuration details
v The RAID and cache enablement battery card (CCIN 2BCF)
along with the base embedded storage controller creates one
RAID adapter with 175 MB cache and reports as CCIN 57CB.
v The RAID controller card with the cache battery card attached
(CCIN 2B4C) creates the second RAID adapter with a 175 MB
cache.
v The SAS adapters connect to all eight disk drives.