Table 8. Configuration details
Embedded SAS Configuration details
Embedded storage controller (Un-P1-T9)
Cache battery card (Un-P1-C14)
RAID and cache storage controller (Un-P1-C19,
Un-P1-C19-E1) (CCIN 2B4C)
Eight-bay disk drive backplane (Un-P2)
v The RAID and cache enablement battery card (CCIN 2BCF)
and the base embedded storage controller create one RAID
adapter with a 175 MB cache and reports as CCIN 57CB.
v The RAID controller card with a cache battery card attached
(CCIN 2B4C) create the second RAID adapter with a 175 MB
cache.
v Both SAS adapters connect to all eight disk drives and any
drives that are attached by the external cable.
v Physical connections to the SAS cable are enabled so that you
can attach to another SAS port expander in an external disk
enclosure by using a YI cable.
Note: The YI cable must be routed along the right side of the
rack frame (as viewed from the rear) when connecting to an
external disk enclosure and connected to the exact ports as
shown in Figure 8 on page 12 and Figure 9 on page 12.
Related concepts:
“SAS subsystem service considerations for the 8202-E4C, 8202-E4D, 8205-E6C, or 8205-E6D”
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.
SAS subsystem service considerations for the 8202-E4C, 8202-E4D,
8205-E6C, or 8205-E6D
Review several considerations before servicing features within the SAS subsystem for the 8202-E4C,
8202-E4D, 8205-E6C, or 8205-E6D system.
Attention: Do not attempt to remove any parts related to the SAS subsystem if the cache data present
LED on the card in either P1-C19 or P1-C14 is flashing. To see this LED, you must shut down the system
and remove the service cover. The LED shows a no-touch icon (a hand with a slash through it), and
indicates that data might be in the cache on the adapter. To prevent data loss, first make sure that the
system is shut down correctly. If either cache data present LED is flashing, see one of the following topics
before removing any SAS subsystem parts. You can safely replace the cache battery pack when Yes is
displayed next to Battery pack can be safely replaced on the Battery Information panel (for Linux and
IBM i systems) or COMMAND STATUS panel (for AIX
®
systems).
Before servicing any features, review the I/O configurations for each logical partition on your system. It
is important to understand the differences between the various configurations and the resulting service
considerations. In addition, consider possible impacts to the following areas:
v Logical partitions and their I/O adapter assignments
v RAID array configurations
v Physical disk locations
v Path to your boot device
Related information:
Displaying rechargeable battery information
Displaying rechargeable battery information
SAS subsystem 13
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