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https://library.netapp.com/ecmdocs/ECMP1196995/html/GUID-D22C5B1F-060E-4060-A62A-5565AFF2D247.html
ALUA is an industry standard protocol for identifying optimized paths between a storage system and a host. ALUA enables the initiator to query the target about path attributes, such as primary path and secondary path. It also allows the target to communicate events back to the initiator.
http://www.yellow-bricks.com/2009/09/29/whats-that-alua-exactly/
Sep 29, 2009 · I have asked to HP but not yet received an answer. It’s really not practical for us to get a new SAN, sigh, the iSCSI cards are expensive but cheaper than any other alternatives. Also, for the MSA 2012i, the SAN guide specifically says ALUA and MRU, I imagine this is the only supported configuration… Thank you, Tom
https://www.dell.com/community/VNX/VNXe-has-no-ALUA/td-p/6838761
VNXe does not support ALUA. When using iSCSI do not use LACP. Rather implement more iSCSI servers and present them to ESXi. To achieve HA from a SAN perspective use stacked switches. Separated switches will not work, except if you link both switches via a trunk (to not create a bottleneck)
http://www.pearsonitcertification.com/articles/article.aspx?p=2819032
Oct 05, 2017 · Not Supported—The response to the REPORT TPGs and SET TPGs commands is invalid. 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.
https://access.redhat.com/solutions/2954631
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https://drewtonnesen.wordpress.com/2018/04/06/alua-and-mobility-id-on-vmax/
Apr 06, 2018 · The funny thing about the PE, however, is that it does not support ALUA. An exception to every rule as they say. While the Mobility ID can be enabled when you create a device, currently we do not see a benefit in doing so in a VMware environment. Below is an example of a traditional WWN format and the new Mobility Safe ID (Identifier row).
https://www.slideshare.net/AshwinPawar/alua
Sep 23, 2014 · ALUA 1. Asymmetric Logical Unit Access I/O for Logical Unit „A‟, going directly to Node „A‟ owning the Logical Unit In this acronym, „Logical Unit Access‟ part is well understood but „Asymmetrical‟ at the beginning does make it sound little complicated.
https://communities.vmware.com/thread/617879
Sep 06, 2019 · Hi, When using an iSCSI Active/Passive (standby, ALUA access state 0x2) dual node ALUA compatible storage array, ESXi always treats the secondary, standby path as an Active/Optimized path, where I would have expected the path to show as inactive/dead/non optimized.
https://kb.netapp.com/app/answers/answer_view/a_id/1032612/~/how-to-verify-the-alua-plug-in-on-esx-and-esxi-hosts-
Nov 29, 2017 · After the implementation of ALUA in the Firmware 7.83 release, later ESX and ESXi builds will allow the use of a new claim rule called VMW_SATP_ALUA (ESX4.1 and later and ESXi5.0 and later). This article describes the procedure to verify the host claim rule using an ESX / …
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.
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