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).
Figure 1. Disk
bays controlled by each embedded SAS adapter in a two-way split backplane
Review the
SAS subsystem configuration that uses
a three-way split backplane example. If you add the optional
internal SAS cable for a three-way split backplane (FC 1815), the
disk bay configuration changes. The six disk bays are split into three
groups of two. Each of the two embedded SAS adapters controls two
disk bays and a third external PCIe SAS storage adapter controls the
remaining two bays. In the following figure, the highlighted disk
bays represent the disk bays that are controlled by each of the embedded
storage adapters (D1, D4, and D2, D5) and the third external PCIe
adapter (D3, D6). Each of the SAS storage adapters now controls different
disk bays than in the previous configuration without the internal
SAS cable feature.
Figure 2. Disk bays controlled by adapters in
a three-way split backplane
Attention: You
must do proper planning and follow proper procedures before adding
or removing the internal SAS cable for a three-way split backplane
(FC 1815) to maintain system availability and to prevent possible
data loss.
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