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Re: [Xen-users] NPIV + Multipath

And it's going to kill your IO...

I have not used NPIV yet, so my notes are based on "regular" FC experience.


On 22 September 2014 23:24, Nick Couchman <nick.couchman@xxxxxxxxx> wrote:
----- Original Message -----
> From: "Etzion Bar-Noy" <etzion@xxxxxxxxxxxx>
> To: "Nick Couchman" <nick.couchman@xxxxxxxxx>
> Cc: eneal@xxxxxxxxxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx
> Sent: Monday, September 22, 2014 1:21:09 PM
> Subject: Re: [Xen-users] NPIV + Multipath
> Just a note - multipath does not use SCSI ID, but uses Word 83. I
> hope it helps you with your search.
> Etzion

The multipath configuration I have by default uses the following binary as the "getuid_callout" for determining paths:

Based on the name of that binary, I was guessing it uses scsi_id. In any case, I'm open to suggestions on what to replace the "getuid_callout" setting with that would work inside a Xen domU. If there's something else that is able to reliably determine multiple paths to a disk other than the above scsi_id (whatever it uses), I would be interested to know. I thought about using dd to input the X bytes of the disk, then run that through some sort checksum (shasum or something like that), but I'm not familiar enough to know if that would actually be reliable.


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