Why might I observe poor performance or high controller utilization on my Hitachi Adaptable Modular Storage array when using device-mapper-multipath?

Updated -

Releases Found: Red Hat Enterprise Linux 4 and 5

Problem

The Hitachi Adaptable Modular Storage arrays (AMS-xxxx) use an active/passive configuration, in that they expect I/O to occur over one controller while the other is on standby in case the first one fails. In most environments half of the logical devices (a.k.a. LDEVs or LUNs) are configured to use one con...

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