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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 · ALUA is not supported for iSCSI initiator groups on Data ONTAP 7-Mode systems; How to enable ALUA on non-ALUA LUNs. Validate the host OS and the multipathing software as well as the storage controller software support ALUA. If yes, then proceed. For example, ALUA is not supported for VMware ESX until vSphere 4.0.
https://communities.vmware.com/thread/617879
Sep 06, 2019 · LUNs are owned by one Storage controller on the array. From an ESXi point of view you speak of active or "passive" paths, not LUN. I worked with a couple of Dell ALUA arrays and never had the issue you are facing. Does the documentation of the product you use include configuration for ESXi? Can you get support from them?
https://docs.microsoft.com/en-us/windows-hardware/test/hlk/testref/849bcee9-3305-4889-9645-8c4470f60d9c
The test checks whether the device declares support to ALUA by checking the INQUIRY TPGS field before additional testing. If the TGPS field is not 0, then the storage devices at least support REPORT TARGET PORT GROUPS, and the Report Target Port Groups test will be done.
http://www.pearsonitcertification.com/articles/article.aspx?p=2819032
Oct 05, 2017 · The device is claimed by VMW_SATP_ALUA instead of VMW_SATP_ALUA_CX. explicit_support=off means that the array does not support the Explicit mode of AAS management. There is only one TPG_id, which is 0, and it is in an AO AAS.
https://blogs.vmware.com/vsphere/2012/02/configuration-settings-for-alua-devices.html
Feb 03, 2012 · explicit_support: Shows whether or not the device supports explicit ALUA; this option cannot be set by the user as it is a property of the LUN. explicit_allowed : Shows whether or not the user allows the SATP to exercise its explicit ALUA capability if the need arises during path failure.
https://statemigration.com/microsoft-multipath-io-mpio-users-guide-for-windows-server-2012/
When using the Microsoft DSM, storage that implements an Active/Active storage scheme but does not support ALUA will default to use the Round Robin load-balancing policy setting, although a different policy setting may be chosen later.
https://library.netapp.com/ecmdocs/ECMLP2427463/html/GUID-B216C321-1124-4D65-B97A-3177B7A2D9C4.html
Be sure to use host configurations that support ALUA. ALUA is an industry-standard protocol for identifying optimized paths between a storage system and a host computer. The administrator of the host computer does not need to manually select the paths to use.
https://www.slideshare.net/AshwinPawar/alua
Sep 23, 2014 · Steps 1. Run the following command to check if ALUA is enabled: filer> igroup show -v igroup_name 2.If ALUA is not enabled, then manually enable ALUA on the igroup following this command: filer>igroup set igroup alua yes On the Host: 1.Validate the host OS and the multipathing software as well as the storage controller software support ALUA.
https://community.emc.com/docs/DOC-8764
Oct 27, 2010 · Asymmetric Logical Unit Access (ALUA)? Resolution: ALUA allows you to see any given LUN via both storage processors as active but only one of these storage processors “owns” the LUN and because of that there will be optimized and un-optimized paths. The optimized paths are the ones with a direct path to the storage processor that owns the LUN.
http://www.yellow-bricks.com/2009/09/29/whats-that-alua-exactly/
Sep 29, 2009 · Does anyone know if in the case of an IBM DS3500 SAN that is active/passive initially, but with the most recent firmware adds the ALUA functionality, does this make it an active/active SAN? I currently have MRU setup and if trying to split LUN paths between 2 controllers I am getting high latency occassionally causing vmware host failures.
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