Chapter 6. ALUA
Storage arrays provide various configurations and features depending on their class and design. Depending on how the arrays handle I/O to devices presented to hosts, they can be classified as
• Active/Active — I/O (input/output) can be sent to Logical Unit Numbers (LUNs) via any Storage Processor (SP) and port. Most of these arrays have large cache in place, and the I/O is done on the LUN representation in cache and then the writes are flushed to the physical disks asynchronously from the I/O.
• Active/Passive —I/O can be sent only to any port on the Storage Processor that “owns” the LUN (also known as the Active SP). If the I/O is attempted on the LUN via ports on the “non-owner” processor (also known as Passive SP), an error ...
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