At 4:28 PM -0800 2000/3/28, Matthew Jacob wrote:
> Yes, we very much has considered this. What's your issue about this, per se?
> Right now there's no framework code to directly exploit or prohibit multiple
> paths to the same disk, whether via Fibre Channel or SCSI.
Myself, I just need to be able to tell the system that SCSI ID x
LUN y is actually the same logical device as SCSI ID v LUN w, but
that one is preferred and the other is backup, and have FreeBSD deal
with doing the re-targeting in the CAM SCSI driver.
The end result should be that nothing above the CAM SCSI driver
should know that a switch has occurred -- especially not programs
like vinum, which might be called upon to do software
mirroring/striping/RAID on top of the hardware
mirroring/striping/RAID.
Same deal with fibrechannel as SCSI.
Does that about sum it up?
Oh, and Carl -- I don't suppose you're looking at Hitachi DF400
(sometimes rebadged as Comparex D1400) units, are you? If so, I'd
like to talk to you in some depth about these things -- maybe you can
come up with some solutions for some problems I've had.
--
These are my opinions -- not to be taken as official Skynet policy
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