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Rules for SSA Loops
For SSA loops that include an Advanced SerialRAID Adapter (type 4–P), the following
rules apply:
v Each SSA loop must be connected to a valid pair of connectors on the SSA adapter
(that is, either connectors A1 and A2, or connectors B1 and B2).
v A maximum of one pair of adapter connectors can be connected in a particular SSA
loop.
v All member disk drives of an array must be on the same SSA loop.
v A maximum of 48 SSA disk drives can be connected in a particular SSA loop.
v If an SSA adapter that is in a two-way configuration is connected to two SSA loops,
and a second adapter is connected to each loop, both loops must be connected to
the same second adapter.
v Each SSA loop can be connected to no more than two adapters on any one using
system.
v The number of adapters that are supported in an SSA loop is determined by whether
any disk drives are configured for RAID or fast-write operations, and by the type of
adapter (see Table 1).
Table 1. Number of Adapters that are Supported in an SSA Loop
Array Type Number of
Adapters in
Loop
Type of Adapters Allowed
Non-RAID 8 Advanced SerialRAID Adapter
PCI SSA Multi-Initiator/RAID EL Adapter
Micro Channel SSA Multi-Initiator/RAID EL Adapter
RAID-0 1 Advanced SerialRAID Adapter
RAID-1 2 Advanced SerialRAID Adapter at microcode level above 5000
RAID-5 2 Advanced SerialRAID Adapter
PCI SSA Multi-Initiator/RAID EL Adapter
Micro Channel SSA Multi-Initiator/RAID EL Adapter
RAID-10 2 Advanced SerialRAID Adapter at microcode level above 5000
Fast-Write 1 Advanced SerialRAID Adapter at microcode level below 5000
2 Advanced SerialRAID Adapter at microcode level above 5000
See the SSA Adapters: User’s Guide and Maintenance Information manual,
SA33-3272 (Version 01 or above) for more information about the level of code that is
required in the Micro Channel SSA Multi-Initiator/RAID EL Adapter (type 4–M) or the
PCI SSA Multi-Initiator/RAID EL Adapter (type 4–N).
22 User’s Guide and Maintenance Information
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