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Related concepts:
"SAS subsystem service considerations"
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 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:
5886 disk drive enclosure
SAS subsystem service considerations
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.
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:
Logical partitioning
SAS RAID controllers for Linux
SAS RAID controllers for AIX
SAS RAID controllers for IBM i
Service considerations for the internal SAS cable for a three-way split
backplane
To prevent data loss, follow proper procedures before replacing the internal SAS cable for a three-way
split backplane.
Attention: To maintain system availability and to prevent possible data loss, it is important to
understand that these features have implications on the SAS configuration and data accessibility of the
system.
Review the SAS subsystem configuration that uses a two-way split backplane example. This configuration
consists of two independent embedded SAS adapters, each controlling three of the six disk bays. In the
following figure, the highlighted disk bays represent the disk bays that are controlled by each embedded
storage adapter (D1 - D3 and D4 - D6).
12
SAS subsystem
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