From: Olaf Hering <olaf@aepfle.de>
To: Ian Campbell <Ian.Campbell@citrix.com>
Cc: Anthony Perard <anthony.perard@citrix.com>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
xen-devel@lists.xen.org
Subject: Re: incorrect disk numbering with qemu
Date: Thu, 16 Jan 2014 12:44:11 +0100 [thread overview]
Message-ID: <20140116114411.GA29530@aepfle.de> (raw)
In-Reply-To: <1389869890.6697.6.camel@kazak.uk.xensource.com>
On Thu, Jan 16, Ian Campbell wrote:
> Not quite. Each xvd[a-d] creates both a PV and an emulated IDE device
> hd[a-d], which refer to the same underlying volume.
>
> This allows you to boot from hda, do an unplug and then switch to using
> xvda.
Not really: In the end hda is connected to the emulated IDE, so today
its really "sda" in domU because pata_piix will drive it. sda was
connected to emulated LSI SCSI. But xvda was not connected to any
emulated controller, its PV only. Thats how it is done with qemu-trad.
So having hda and xvda in the same config was working, and maybe even
supported?
With qemu-upstream this appearently changed. I'm not saying this change
in behaviour is good or bad, just that something changed. Some people
still use the kernel names instead of UUID or LABEL. So they have to
adjust their config in domU and also in domU.cfg before they switch from
qemu-trad to qemu-upstream.
Olaf
next prev parent reply other threads:[~2014-01-16 11:44 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-15 17:12 incorrect disk numbering with qemu Olaf Hering
2014-01-15 17:22 ` Ian Campbell
2014-01-15 17:45 ` Olaf Hering
2014-01-16 10:58 ` Ian Campbell
2014-01-16 11:44 ` Olaf Hering [this message]
2014-01-16 11:49 ` Ian Campbell
2014-01-16 12:01 ` Olaf Hering
2014-01-16 15:15 ` Stefano Stabellini
2014-01-16 15:31 ` Jan Beulich
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20140116114411.GA29530@aepfle.de \
--to=olaf@aepfle.de \
--cc=Ian.Campbell@citrix.com \
--cc=anthony.perard@citrix.com \
--cc=stefano.stabellini@eu.citrix.com \
--cc=xen-devel@lists.xen.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.