My EqualLogic arrays do not disconnect when resizing volumes. When I need to resize, on the Windows side I open the iSCSI control panel, and get ready to click the 'logon' button. I then resize the volume on the OpenSolaris box, and immediately after that is complete, on the Windows side, re-login to the target. Since the Windows initiator can tolerate brief disconnects, IO is not stopped or adversely affected, just paused for those few seconds. It works fine. Multi-path is a little more complicated as you would have to re-logon to all of your paths, but if you have at least one path active, you should be fine.
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