GEOM for multipath? How?

Pawel Jakub Dawidek pjd at
Thu Nov 10 14:01:36 GMT 2005

On Thu, Nov 10, 2005 at 02:48:15PM +0100, Poul-Henning Kamp wrote:
+> In message <32275093.1131627986609.JavaMail.root at>, Sergey 
+> Babkin writes:
+> >>From: Danny Howard <dannyman at>
+> >
+> >>Hey ... yes, I recall there being issues with the QLogic drivers ... I
+> >>wonder if anyone has given the mpt drivers a shot?  I was able to speak
+> >>with an engineer at Engenio (now owned by LSI) and she said there were
+> >>some issues with the QLogic dual-port cards that were interesting to
+> >>her, but the LSI dual-port cards behaved differently ...
+> >
+> >QLogic worked fine in multi-path configuration with UnixWare.
+> >I think LSI and Adaptec did too. The only trick is to make sure 
+> >that the IRQs of the cards are not shared between the cards or with
+> >any other device.
+> I suspect it is not the card as much as the driver, but I am not sure.

I was able to modify the driver in a way multipathing started to work
(no more hanging request when path was disconnected). It was hackish,
but worked, so I'm quite sure it's driver's fault.

Pawel Jakub Dawidek             
pjd at                 
FreeBSD committer                         Am I Evil? Yes, I Am!
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