The dynamic character of multipathing and failover necessitates the versatility of controlling and regulating an ALUA TPGa€™s AAS
The reverse is true for TPG with this is actually, it really is AO for LUN 2 and ANO for LUN 1.
On some active/passive ALUA-capable arrays, you may discover interface groups with a€?Standbya€? AAS as opposed to a€?ANOa€? on the non-owner SP.
Asymmetric Access State
Harbors in an ALUA TPG tends to be in the same AAS constantly regarding confirmed LUN. The TPG’s AAS are reported to your initiators as a result toward DOCUMENT TPGS command. The TPG descriptor try reported in byte 1 of these feedback.
Transitioning-The TPG AAS is in the means of changing from condition to another. If the SP of an AO TPG will be rebooted or perhaps is used off-line, or if the SAN (storage area system) admin by hand moves LUN ownership (on EMC CLARiiON, this can be generally trespass), the AAS associated with TPG about alternate SP modifications to AO. While this process are ongoing, the TPG AAS are transitioning.
While the TPG is in this county, receiving needs from initiators go back ACTIVE true free to use hookup apps for married or a CHECK PROBLEM with feel key NOT READY and ASC (additional feel laws) PRACTICAL UNIT NOT OBTAINABLE or ASYMMETRIC ACCESSIBILITY COUNTY CHANGEOVER.
Standby-This county is similar to a passive SP in a non-ALUA configuration and on particular ALUA-capable arrays. (more…)