Rules for SSA Loops
For SSAloops that include an Advanced SerialRAID Adapter (type 4–P), the following
rules apply:
vEach SSAloop must be connected to a valid pair of connectors on the SSA adapter
(that is, either connectorsA1 and A2, or connectors B1 and B2).
vAmaximum of one pair of adapter connectors can be connected in a particular SSA
loop.
vAll member disk drives of an array must be on the same SSAloop.
vAmaximum of 48 SSA disk drives can be connected in a particular SSA loop.
vIf an SSAadapter 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.
vEach SSAloop can be connected to no more than two adapters on any one using
system.
vThe number of adapters that are supported in an SSAloop is determined by whether
any disk drives are configured for RAID or fast-write operations, and by the type of
adapter (see Table1).
Table1. Number of Adapters that are Supported in an SSA Loop
Array Type Number of
Adapters in
Loop
Typeof Adapters Allowed
Non-RAID 8 Advanced SerialRAID Adapter
PCI SSAMulti-Initiator/RAID EL Adapter
Micro Channel SSAMulti-Initiator/RAID EL Adapter
RAID-0 1 Advanced SerialRAID Adapter
RAID-1 2 Advanced SerialRAIDAdapter at microcode level above 5000
RAID-5 2 Advanced SerialRAID Adapter
PCI SSAMulti-Initiator/RAID EL Adapter
Micro Channel SSAMulti-Initiator/RAID EL Adapter
RAID-10 2 Advanced SerialRAIDAdapter at microcode level above 5000
Fast-Write 1 AdvancedSerialRAID Adapter at microcode level below 5000
2 Advanced SerialRAIDAdapter at microcode level above 5000
See the SSAAdapters: User’s Guide and Maintenance Information manual,
SA33-3272 (Version01 or above) for more information about the level of code that is
required in the Micro Channel SSAMulti-Initiator/RAID EL Adapter (type 4–M) or the
PCI SSAMulti-Initiator/RAID EL Adapter (type 4–N).
22 User’s Guide and Maintenance Information
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