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 ...