https://kb.netapp.com/support/index?page=content&id=3012899
What is Asymmetric Logical Unit Access?
Asymmetric Logical Unit Access (ALUA), also known as Target Port
Groups Support (TPGS), is a set of SCSI concepts and commands that
define path prioritization for SCSI devices. ALUA is a formalized way to
describe SCSI port status, and access characteristics. In short, it
describes paths as fast, slow, or down and the transitions between these
states in a standards-compliant manner. This standard is designed to
define the protocol on how multipath IO should be managed between hosts
and storage devices. It will also reduce vendor-specific coding and
complexity.
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