To prevent data loss, follow proper procedures before replacing
the 175 MB cache RAID – dual IOA enablement card.
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 dual storage IOA with internal drives example. If you add
the optional 175 MB Cache Raid – Dual IOA enablement card (FC 5662),
it creates a configuration consisting of two embedded SAS adapters
in a dual storage IOA or high availability (HA) RAID mode. Both adapters
mutually control all of the six disk drive bays and have access to
common data (see the following figure). In addition, the two rechargeable
battery packs on this feature enable nonvolatile write cache of the
embedded SAS storage adapters.
Figure 2. Disk bays controlled by
both embedded SAS adapters that have dual storage IOA with internal
drives
Attention: You
must do proper planning and follow proper procedures before adding
or removing the 175 MB Cache Raid – Dual IOA enablement card (FC 5662)
to maintain system availability and to prevent possible data loss.
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