O'Reilly logo

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

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

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 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 a passive SP ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required