да, точно. все так как вы и сказали.
вот выдержка из EVA and vSphere Best Conf Practices:
All EVA storage solutions – models P6x00, EVA8x00/6x00/4x00 – are dual-controller asymmetric active-active arrays that are compliant with the SCSI ALUA standard for Vdisk access/failover and I/O processing.
Note
ALUA is part of the SCSI Primary Commands – 3 (SPC-3) standard.
While the active-active nature of the array allows I/O requests to a Vdisk to be serviced by either controller, the array’s asymmetry forces the optimal access path to the Vdisk to be used (that is, the I/O path to the controller that requires less processing overhead).
The controller with the optimal path to the Vdisk – managing controller – can issue I/Os directly to the Vdisk, whereas the non-managing controller – proxy controller – can receive I/O requests but must pass them to the managing controller to initiate fulfillment.
спасибо!