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AX150 loop vs point to point

Posted on 2010-11-14
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Last Modified: 2012-08-13
Why does point to point not work when connected directly from a W2K8 server with a QLogic QLA2342 card to an AX150?  It only works in 'Loop'.  Why is this?
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Question by:B1izzard
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Expert Comment

by:Duncan Meyers
ID: 34133434
That's very odd. It *should* work point-to-point. It doesn't really matter, though, as you're connecting directly to the AX150
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Author Comment

by:B1izzard
ID: 34133679
Do you know offhand what the technical difference is between the 2 when connected directly?  I'm just curious what would cause the green LED on the HBA to turn off when booting via point to point, where it turns green when booting in loop.
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Duncan Meyers earned 2000 total points
ID: 34133914
The green LED indicates that the HBA driver is loaded and that it has connected to the array or SAN fabric. For a point-to-point or fabric connection, this is a FLOGI (Fabric LOG In). For an arbitrated loop, it's a LIP primitive. I'd say that the HBA doesn't initiate a FLOGI until the driver is loaded whereas a LIPis probably handled out of firmware.
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Author Closing Comment

by:B1izzard
ID: 34133918
Thank you.
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Expert Comment

by:Duncan Meyers
ID: 34133931
Thanks!
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