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Storage Design and Implementation in vSphere 6: A Technology Deep Dive, 2nd Edition by Mostafa Khalil

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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 follows:

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 caches 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 ...

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