Table of Contents
Advertisement
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
Non-RAID
RAID-0
| | |
RAID-1
RAID-5
| | |
RAID-10
| | |
Fast-Write
| |
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
Number of
Type of Adapters Allowed
Adapters in
Loop
8
Advanced SerialRAID Adapter
PCI SSA Multi-Initiator/RAID EL Adapter
Micro Channel SSA Multi-Initiator/RAID EL Adapter
1
Advanced SerialRAID Adapter
2
Advanced SerialRAID Adapter at microcode level above 5000
2
Advanced SerialRAID Adapter
PCI SSA Multi-Initiator/RAID EL Adapter
Micro Channel SSA Multi-Initiator/RAID EL Adapter
2
Advanced SerialRAID Adapter at microcode level above 5000
1
Advanced SerialRAID Adapter at microcode level below 5000
2
Advanced SerialRAID Adapter at microcode level above 5000
Advertisement
Table of Contents
