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xen-devel
Re: [Xen-devel] [PATCH] Support for official xvd major number
On 14 Jul 2005, at 22:35, Jeremy Katz wrote:
Also, on a side note that is really unrelated to the patch, is there
really a good reason why these hoops are still gone through instead of
having the kernel allocate the next disk instead of the hard-coding
with
things somewhat out of order and stealing the major/minors of other
subsystems?
I'm not sure what you mean? Specifying device numbers up front in a
config file means that you know e.g., what device names to put in your
fstab and what to specify as your rootfs device. And stealing scsi/ide
device names/numbers is the strategy of least surprise to userspace
tools and scripts (e.g., some vendor init scripts have a baby if
filesystems are mounted on a weirdly-named block device like xvd<foo>).
And the xvd* names and numbers are there if you want to avoid clashes
with other subsystems.
-- Keir
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