ALUA - Asymmetric logical unit access
ALUA - you can 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 unoptimized paths.
цитата T10 в SPC3:
Asymmetric logical unit access occurs when the access characteristics of one port may differ from those of another port. [..] While commands and task management functions (see SAM-4) may be routed to a logical unit through any target port, the performance may not be optimal, and the allowable command set may be less complete than when the same commands and task management functions are routed through a different target port.
в Vmware настройки datastore политика доступа - VMW_SATP_ALUA
port state can be one of these:
Active/Optimized
Active/Non-Optimized
Standby
Unavailable
In-transition
http://kb.vmware.com/kb/1022030
http://www.boche.net/blog/index.php/2010/02/04/configure-vmware-esxi-round-robin-on-emc-storage/
цитата T10 в SPC3:
Asymmetric logical unit access occurs when the access characteristics of one port may differ from those of another port. [..] While commands and task management functions (see SAM-4) may be routed to a logical unit through any target port, the performance may not be optimal, and the allowable command set may be less complete than when the same commands and task management functions are routed through a different target port.
в Vmware настройки datastore политика доступа - VMW_SATP_ALUA
port state can be one of these:
Active/Optimized
Active/Non-Optimized
Standby
Unavailable
In-transition
http://kb.vmware.com/kb/1022030
http://www.boche.net/blog/index.php/2010/02/04/configure-vmware-esxi-round-robin-on-emc-storage/