84 IBM Power 770 and 780 (9117-MMD, 9179-MHD) Technical Overview and Introduction
This configuration increases availability by using dual storage IOA or high availability (HA) to
connect multiple adapters to a common set of internal disk drives. It also increases the
performance of RAID arrays. The following rules apply to this configuration:
This configuration uses the 175 MB Cache RAID - Dual IOA Enablement Card (FC 5662).
Using the dual IOA enablement card, the two embedded adapters can connect to each
other and to all six disk drives, and also the 12 disk drives in an external disk drive
enclosure, if one is used.
The disk drives are required to be in RAID arrays.
There are no separate SAS cables required to connect the two embedded SAS RAID
adapters to each other. The connection is contained within the backplane.
RAID 0, 10, 5, and 6 support up to six drives.
SSDs and HDDs can be used, but can never be mixed in the same disk enclosure.
To connect to the external storage, you need to connect to the FC 5886 disk drive
enclosure.
Figure 2-22 shows the topology of the RAID mode.
Figure 2-22 RAID mode (external disk drives option)
2.9.4 DVD
The DVD media bay is directly connected to the integrated SAS controller on the I/O
backplane and has a specific chip (VSES) for controlling the DVD LED and power. The VSES
appears as a separate device to the device driver and operating systems (Figure 2-19 on
page 80).
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DVD
Integrated
Obsidian-E
Integrated
Obsidian-E
SAS A
Port
Expander
VSC7158
SAS B
Port
Expander
VSC7158
P7IOC
P7IOC
PCI-e 8x
PCI-e 8x
Integrated Obsidian
Redriver
Obsidian-E
IO connections
SAS 4x connector
Option pins (2x)
Link active pin (1x)
Option pins (2x)
Link active pin (1x)
Battery charge
Battery charge
Battery
Battery
VSES
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