Re: Disk naming (Was Re: [Xen-devel] [PATCH] Guest boot loader support [1/2])

[Jeremy Katz <katzj@xxxxxxxxxx>]

On Thu, 2005-04-14 at 14:22 -0400, Philip R Auld wrote:
> As a slight but related digression, has any thought been given to
> using something other than /dev/[hs]d* names for specifying block
> devices? The name /dev/sdb only has meaning for the current
> state of the running dom0 OS. It may not mean the same device
> on a different dom0. This can lead to problems in say migration.
> In fact, it may not be the same when the domain is restored locally.

To be even slightly more radical, I don't think that for the guests, the
vbds should be being exposed as SCSI or IDE since they're not.  By being
presented as such, there's a set of assumptions about ioctls and
behaviors which aren't the case for disks on blkfront.  Even with all of
the pain using your own major/minor for a disk device is, I think it
probably is the right thing to do.  And I've added the code to
parted/lvm2/.../etc enough to be able to do it in my sleep this point if
this route is taken :)

Jeremy


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