IBM SG24-5131-00 manual Rules for SSA Loops

Feature Code	Adapter	Bus	Adapter Description	Number	of	Hardware
	Label			Adapters	per	Raid Types
				Loop
6219	4-M	MCA	Enhanced RAID-5	81		5

1See 2.3.1.3, “Rules for SSA Loops” on page 20 for more information.

The following rules apply to SSA Adapters:

•You cannot have more than four adapters in a single system.

•The MCA SSA 4-Port RAID Adapter (FC 6217) and PCI SSA 4-Port RAID Adapter (FC 6218) are not useful for HACMP, because only one can be in a loop.

•Only the PCI Multi Initiator/RAID Adapter (FC 6215) and the MCA Multi Initiator/RAID EL Adapter (FC 6219) support target mode SSA (for more information about target mode SSA see 3.2.2, “Non TCP/IP Networks” on page 63).

2.3.1.3 Rules for SSA Loops

The following rules must be followed when configuring and connecting SSA loops:

•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).

•Only one of the two pairs of connectors on an adapter card can be connected in a single SSA loop.

•A maximum of 48 devices can be connected in a single SSA loop.

•A maximum of two adapters can be connected in a particular loop if one adapter is an SSA 4-Port adapter, Feature 6214.

•A maximum of eight adapters can be connected in a particular loop if all the adapters are Enhanced SSA 4-Port Adapters, Feature 6216.

•A maximum of two SSA adapters, both connected in the same SSA loop, can be installed in the same system.

For SSA loops that include an SSA Four-Port RAID adapter (Feature 6217) or a PCI SSA Four-Port RAID adapter (Feature 6218), the following rules apply:

•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).

20 IBM Certification Study Guide AIX HACMP