I'm had HMO's set to 21, 54, 63 for some time on our old VSP. We about to migrate to a G800. Best I can tell this will not change for the G800?
Same Host Modes and Host Mode Options apply.
Take a look at these two manuals:
Attach hosts to VSP Gx00 and Fx00 - Hitachi Data Systems Knowledge
Provisioning Guide for VSP Gx00 and Fx00 - Hitachi Data Systems Knowledge
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