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Chapter 5. Dual storage IOA configurations
You can increase availability using a dual storage I/O adapter (IOA) configuration to connect multiple
controllers to a common set of disk expansion drawers and the included disks and disk arrays.
Note: Not all controllers support all configurations. See the PCI-X SAS RAID cards or the PCIe SAS
RAID card comparison tables to look for controllers that have dual storage IOA configurations.
Related concepts
"PCI-X SAS RAID card comparison" on page 3
Use the table in this topic to compare the features of PCI-X SAS RAID cards for IBM i. There are also
images of adapters for you to view.
"PCIe SAS RAID card comparison" on page 6
Use the table in this topic to compare the features of a PCI Express (PCIe) SAS RAID cards for IBM i.
There are also images of adapters for you to view.
Possible disk storage IOA configurations
This topic shows a table illustrating what is needed to have dual storage IOA configurations with RAID
or system mirroring and images of dual storage IOA configurations.
Table 5. Disk protection with dual storage. This table describes what is needed to have dual storage with different
kinds of disk protection.
Multi-initiator configuration
RAID
System mirroring
The following figure illustrates an example of a Dual storage IOA configuration with RAID.
© Copyright IBM Corp. 2009
Dual storage IOA
v Two controllers
v Both controllers must have the same write cache
capability and write cache sizes
v Both controllers must support dual storage IOA
configuration
v Controllers are in the same system or partition
v Four controllers (two pairs of controllers)
v Each pair of controllers must have the same write
cache capability and write cache sizes
v Each pair of controllers must support dual storage
IOA configuration
v Controllers are in the same system or partition
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