Hi all,
We noticed a problem in a complex fabric with IVR - inter-VSAN routing
with certain targets.
IVR provides a way for a shared device such as a tape drive to appear
in multiple VSANs by a sort of proxying/NAT setup. It's available on
some MDS switches.
What happens is that the switches can delay the PLOGI to the target
for longer than the current E_D_TOV (2-second) timeout. When libfc aborts
the PLOGI, the abort causes the target to send back a LOGO. This may
not cause a problem, when we retry, but it would be nicer if we didn't
retry so quickly.
Other HBAs use a timeout of 2 * R_A_TOV = 20 seconds, I'm told.
Does anyone see a problem with changing libfc accordingly?
This shouldn't cause a problem because PLOGI retries should be rare,
but if they do occur would delay target setup by a lot.
I would keep the FLOGI retry period at 2 seconds, however.
Thanks,
Joe
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