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Re: [Xen-devel] vscsi and /dev/tape/by-path

To: James Harper <james.harper@xxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] vscsi and /dev/tape/by-path
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Tue, 11 Jan 2011 12:37:24 -0500
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On Tue, Jan 11, 2011 at 01:41:29PM +1100, James Harper wrote:
> I use vscsi fairly extensively (under Windows mainly for testing
> baremetal restores from tape), and have a problem that's been bugging me
> for ages. If I use "/dev/st4" it works fine, but obviously that's
> hopeless unreliable as it relies on device enumeration order at boot. I
> want to use something like "
> /dev/tape/by-path/pci-0000:01:08.0-scsi-0:0:3:0-st" so that I am
> guaranteed of getting the right drive, but vscsi doesn't appear to
> support it.
> Digging into it, I see function vscsi_get_hctl_and_devname_by that
> attempts to figure out the sg device that corresponds to whatever I
> specified in the config file. If I could modify that function to simply
> follow the symlinks until I get to a real device that would probably be
> sufficient, but is that the right way to do it?

Yup. Thought I would think that using the /dev/by-uuid/ would be a better
way of doing it in case you want to passthrough a SCSI disk for example?

Thought what if you want to pass in a SCSI scanner? Would that work?

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