Sas Subsystem Configuration That Uses A Two-Way Split Backplane - IBM 8412-EAD Manual

Table 2. SAS subsystem configurations (continued)
175 MB Cache
RAID - Dual
SAS IOA
subsystem enablement
configuration card (FC 5662)
Dual storage Yes
IOA Note: The
configuration internal dual
using internal RAID IOA
disk drives adapters report
as CCIN 57CF.
Dual storage Yes
IOA Note: The
configuration internal dual
using internal RAID IOA
disk drives adapters report
and external as CCIN 57CF.
disk enclosure
v Each node in a system can have a different SAS subsystem configuration.
v Using the SAS drive assembly on nodes 3 and 4 is optional.
Related concepts:
"SAS subsystem service considerations" on page 12
There are several considerations to review before servicing features within the SAS subsystem for the
8412-EAD, 9117-MMB, 9117-MMC, 9117-MMD, 9179-MHB, 9179-MHC, or 9179-MHD system.
"Service considerations for the internal SAS cable for a three-way split backplane" on page 12
To prevent data loss, follow proper procedures before replacing the internal SAS cable for a three-way
split backplane.
"Service considerations for the 175 MB cache RAID - dual IOA enablement card" on page 13
To prevent data loss, follow proper procedures before replacing the 175 MB cache RAID – dual IOA
enablement card.
"Service considerations for the cache battery pack" on page 14
To prevent data loss, follow proper procedures before replacing the cache battery pack on the 175 MB
cache RAID – dual IOA enablement card.
Related information:
Serial-attached SCSI cable planning
175MB Cache RAID - Dual IOA Enablement Card (FC 5662)

SAS subsystem configuration that uses a two-way split backplane

This topic provides rules and examples of a configuration that uses a two-way split backplane.
The following rules apply to this configuration:
External SAS
components SAS port cables
None None
Requires an Internal SAS port
external disk (FC 1819): SAS
enclosure (FC cable assembly
5886 or FC 5887) for connecting to
an external SAS
drive enclosure
SAS cables Limitations
Not applicable
v Internal cable (FC
v The six drives
Only HDDs are
v YI cable (FC 3686):
supported.
System to SAS disk
enclosure, Single
adapter with Dual
path 1.5 meter
v YI cable (FC 3687):
System to SAS disk
enclosure, Single
adapter with Dual
path 3 meter
1815) cannot be
used with the
dual storage IOA
or high
availability (HA)
RAID
configuration.
can be HDDs or
SSDs.
5
SAS subsystem