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https://blogs.vmware.com/vsphere/2012/02/configuration-settings-for-alua-devices.html
Feb 03, 2012 · In implicit ALUA, a device's TPG state will be managed by the target device itself. This is not configurable either, as again it is an attirbute of the device. ... Target Port Group Support. TPGS provides a method for determining the access characteristics of a path to a LUN through a target port. It supports soliciting information about ...
https://www.slideshare.net/AshwinPawar/alua
Sep 23, 2014 · In implicit ALUA, the target device itself manages a device‟s Target Port Group states. 1st Stage: Discovery TARGET PORT GROUPS SUPPORT [TPGS]: SCSI logical units with asymmetric logical unit access may be identified using the INQUIRY command. The value in the target port group support (TPGS) field indicates whether or not the logical unit ...
http://www.pearsonitcertification.com/articles/article.aspx?p=2819032
Oct 05, 2017 · This means that the storage array does not support ALUA or, in the case of EMC CLARiiON, the initiator records are not configured in a mode that supports ALUA. Implicit—The array responds to REPORT TPGs but not SET TPGs commands. In this case, setting the TPG’s AAS is done only by the storage array.
https://frankdenneman.nl/2010/03/25/esx4-alua-and-hp-continuous-access/
Mar 25, 2010 · ESX4 ALUA, TPGS and HP CA. March 25, 2010 9249 views. 9249 views 10 min read. ... VMware addressed this shortcoming and added ALUA support in the new storage stack of ESX4. The ALUA support is a great feature of the new storage architecture, it reduces a lot of extra manual steps of creating a proper load-balanced environment. ... Implicit LUN ...
http://www.yellow-bricks.com/2009/09/29/whats-that-alua-exactly/
Sep 29, 2009 · First of all ALUA stands for “Asymmetric Logical Unit Access”. As Chad explains and as a google search shows it’s common for midrange arrays these days to have ALUA support. With midrange we are talking about EMC Clariion, HP EVA and others.
https://bugzilla.redhat.com/show_bug.cgi?id=482737
Asymmetric Logical Unit Access (ALUA) support in device-mapper-multipath has been updated, adding explicit ALUA support for Clariion storage. Earlier versions of Red Hat Enterprise Linux 5 added support for implicit ALUA (i.e. the operating system is not aware of which storage device paths have optimized performance and which have non-optimized performance).
https://library.netapp.com/ecm/ecm_download_file/ECMP12404601
Editing the sd.conf file and the ssd.conf file for TPGS support in Solaris 10 on page 64 has been added to provide updates to the Solaris 10 systems so failover with TPGS works correctly. In Multipath drivers for the VMware operating system and upgrade instructions: 6
https://www.netapp.com/us/media/tr-4604.pdf
Support for TPGS reporting was introduced initially for a few specific host types in the 07.36.XX.XX firmware release (circa 2008) and prior to support for ALUA. In these earlier firmware releases, the two target port group states were reported as active/optimized and standby instead of active/optimized and active/nonoptimized.
https://forum.proxmox.com/threads/iscsi-help-required.37675/
Oct 25, 2017 · The Proxmox team works very hard to make sure you are running the best software and getting stable updates and security enhancements, as well as quick enterprise support. Tens of thousands of happy customers have a Proxmox subscription.
https://kb.netapp.com/app/answers/answer_view/a_id/1003251/~/asymmetric-logical-unit-access-%28alua%29-support-on-netapp-storage---frequently
Nov 27, 2017 · 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.
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