5:34 a.m.
I can mount qcow2 img to nbd devices through guestfish or qemu-nbd
I'm curious about which performance is better?
7:18 a.m.
On Thu, Jul 27, 2017 at 06:34:13PM +0800, lampahome wrote:
I can mount qcow2 img to nbd devices through guestfish or qemu-nbd
I'm curious about which performance is better?
They do quite different things, they're not comparable.
Can you specifically give the commands you are trying? We might be
able to give more sensible advice.
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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11:23 a.m.
2017-07-27 20:18 GMT+08:00 Richard W.M. Jones <rjones(a)redhat.com>:
On Thu, Jul 27, 2017 at 06:34:13PM +0800, lampahome wrote:
> I can mount qcow2 img to nbd devices through guestfish or qemu-nbd
>
> I'm curious about which performance is better?
They do quite different things, they're not comparable.
Can you specifically give the commands you are trying? We might be
able to give more sensible advice.
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~
rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
Fedora Windows cross-compiler. Compile Windows programs, test, and
build Windows installers. Over 100 libraries supported.
http://fedoraproject.org/wiki/MinGW
guestfish:
guestfish --rw -a demo.qcow2 -m /dev/nbd0
qemu-nbd:
qemu-nbd -c /devnbd0 demo.qcow2
I just want to mount demo.qcow2 to a device
11:31 a.m.
On Fri, Jul 28, 2017 at 12:23:04AM +0800, lampahome wrote:
2017-07-27 20:18 GMT+08:00 Richard W.M. Jones
<rjones(a)redhat.com>:
> On Thu, Jul 27, 2017 at 06:34:13PM +0800, lampahome wrote:
> > I can mount qcow2 img to nbd devices through guestfish or qemu-nbd
> >
> > I'm curious about which performance is better?
>
> They do quite different things, they're not comparable.
>
> Can you specifically give the commands you are trying? We might be
> able to give more sensible advice.
guestfish:
guestfish --rw -a demo.qcow2 -m /dev/nbd0
qemu-nbd:
qemu-nbd -c /dev/nbd0 demo.qcow2
These don't do the same thing. In fact the guestfish command doesn't
work at all.
I just want to mount demo.qcow2 to a device
Still unclear.
You want to export demo.qcow2 as NBD? Use qemu-nbd.
You want to mount demo.qcow2 on the local filesystem? (This doesn't
involve NBD.) Use:
mkdir /tmp/mnt
guestmount --rw -a demo.qcow2 -i /tmp/mnt
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-df lists disk usage of guests without needing to install any
software inside the virtual machine. Supports Linux and Windows.
http://people.redhat.com/~rjones/virt-df/
2:53 a.m.
2017-07-28 0:31 GMT+08:00 Richard W.M. Jones <rjones(a)redhat.com>:
On Fri, Jul 28, 2017 at 12:23:04AM +0800, lampahome wrote:
> 2017-07-27 20:18 GMT+08:00 Richard W.M. Jones <rjones(a)redhat.com>:
>
> > On Thu, Jul 27, 2017 at 06:34:13PM +0800, lampahome wrote:
> > > I can mount qcow2 img to nbd devices through guestfish or qemu-nbd
> > >
> > > I'm curious about which performance is better?
> >
> > They do quite different things, they're not comparable.
> >
> > Can you specifically give the commands you are trying? We might be
> > able to give more sensible advice.
>
> guestfish:
> guestfish --rw -a demo.qcow2 -m /dev/nbd0
>
> qemu-nbd:
> qemu-nbd -c /dev/nbd0 demo.qcow2
These don't do the same thing. In fact the guestfish command doesn't
work at all.
> I just want to mount demo.qcow2 to a device
Still unclear.
You want to export demo.qcow2 as NBD? Use qemu-nbd.
You want to mount demo.qcow2 on the local filesystem? (This doesn't
involve NBD.) Use:
mkdir /tmp/mnt
guestmount --rw -a demo.qcow2 -i /tmp/mnt
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~
rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-df lists disk usage of guests without needing to install any
software inside the virtual machine. Supports Linux and Windows.
http://people.redhat.com/~rjones/virt-df/
I tried this:
mkdir /tmp/mnt
guestmount --rw -a demo.qcow2 -i /tmp/mnt
but it shows guestmount no operating sys found on the disk
If using guestmount -i remove this option and choose the filesystems you
want to see by manually adding -m options
why
3:13 a.m.
On Fri, Jul 28, 2017 at 03:53:26PM +0800, lampahome wrote:
2017-07-28 0:31 GMT+08:00 Richard W.M. Jones
<rjones(a)redhat.com>:
> On Fri, Jul 28, 2017 at 12:23:04AM +0800, lampahome wrote:
> > 2017-07-27 20:18 GMT+08:00 Richard W.M. Jones <rjones(a)redhat.com>:
> >
> > > On Thu, Jul 27, 2017 at 06:34:13PM +0800, lampahome wrote:
> > > > I can mount qcow2 img to nbd devices through guestfish or qemu-nbd
> > > >
> > > > I'm curious about which performance is better?
> > >
> > > They do quite different things, they're not comparable.
> > >
> > > Can you specifically give the commands you are trying? We might be
> > > able to give more sensible advice.
> >
> > guestfish:
> > guestfish --rw -a demo.qcow2 -m /dev/nbd0
> >
> > qemu-nbd:
> > qemu-nbd -c /dev/nbd0 demo.qcow2
>
> These don't do the same thing. In fact the guestfish command doesn't
> work at all.
>
> > I just want to mount demo.qcow2 to a device
>
> Still unclear.
>
> You want to export demo.qcow2 as NBD? Use qemu-nbd.
>
> You want to mount demo.qcow2 on the local filesystem? (This doesn't
> involve NBD.) Use:
>
> mkdir /tmp/mnt
> guestmount --rw -a demo.qcow2 -i /tmp/mnt
>
> Rich.
>
> --
> Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~
> rjones
> Read my programming and virtualization blog: http://rwmj.wordpress.com
> virt-df lists disk usage of guests without needing to install any
> software inside the virtual machine. Supports Linux and Windows.
> http://people.redhat.com/~rjones/virt-df/
I tried this:
> mkdir /tmp/mnt
> guestmount --rw -a demo.qcow2 -i /tmp/mnt
but it shows guestmount no operating sys found on the disk
If using guestmount -i remove this option and choose the filesystems you
want to see by manually adding -m options
The FAQ covers what the -i option is doing:
http://libguestfs.org/guestfs-faq.1.html#whats-the-deal-with-guestfish--i
If demo.qcow2 doesn't contain a real operating system then you will
need to replace -i with one or more -m options to specify the
filesystems that you want to be visible under /tmp/mnt, eg to make the
first partition of the disk visible:
guestmount --rw -a demo.qcow2 -m /dev/sda1 /tmp/mnt
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-df lists disk usage of guests without needing to install any
software inside the virtual machine. Supports Linux and Windows.
http://people.redhat.com/~rjones/virt-df/
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