HP AD510A - StorageWorks Modular Smart Array 1500 cs 2U Fibre Channel SAN Attach Controller Shelf Hard Drive Installation Manual page 19

Note:
The MSA ships with a single controller and active/passive firmware pre-installed. If
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you plan to install an additional MSA controller and are interested in upgrading to
active/active, consider the complexity of your SAN, including the variety of device
types, operating systems, failover tools, and access requirements.
Confirm the latest list of supported operating systems, servers, Host Bus Adapters,
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and any homogeneous/heterogeneous network limitations for the different MSA
firmware versions. See the two versions (active/active and active/passive) of the
compatibility guide, available on the Technical documents page of the MSA1500
website: http://www.hp.com/go/msa1500cs.
After upgrading the MSA to active/active firmware, it is not possible to downgrade
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at a later time to an active/passive version. Re-loading the older, active/passive
firmware will result in the loss of all configuration information on the MSA.
active/active firmware is supported for use only on MSA with 256MB or greater
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controller cache modules. Before upgrading to active/active firmware, verify that
both MSA controllers meet this requirement.
For information on upgrading the MSA to active/active, see the migration
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instructions for your operating system, available on the Technical documents page
of the MSA1500 website: http://www.hp.com/go/msa1500cs.
HP StorageWorks 1500 Modular Smart Array Installation Guide
When examining the available firmware versions, consider the following:
Installation Procedures - All Deployments
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