[linux-lvm] LVM and Network Block Device (problem sollution)
Heinz J . Mauelshagen
mauelshagen at sistina.com
Mon Nov 3 04:15:02 UTC 2003
On Sat, Nov 01, 2003 at 06:27:35AM +0100, Spam wrote:
>
> The sollution to the problem was simple. The lvm tools are hardcoded
> (from lvm_dir_cache.c) to only look for specific directories when
> scaning for lvm disks. For network block devices lvm looks only in
> /dev/nb/*, while my Gentoo kernel created /dev/nbd/*.
>
> A simple fix was to make a link /dev/nb->/dev/nbd and it worked. I
> did not find anything about this in the howto or man-pages.
In LVM2 we don't have hard-coded device namespace like this any more.
You can set up filters in /etc/lvm/lvm.conf, run vgscan and devices
conforming to your filters are used/excluded.
Want to give LVM2 a try ? ;)
(It is LVM1 metadata compatible)
>
> //Anders
>
> > Hello,
>
> > How can I make lvm to recognize my network block devices? They are
> > listed in /dev/nbd/* and I can access them fine with fdisk or dd.
>
> > But when I try pvdisplay /dev/nbd/0 I get the following error:
>
> > pvdisplay - ERROR "pv_read(): pv_create_name_from_kdev_t" no VALID
> > physical volume "/dev/nbd/0"
>
> > I get no errors in the logs either so I am not sure where to start.
>
> > From what I see lvmdiskscan etc looks in /proc/partitions and never
> > scans /dev/ for valid blockdevices?
>
> > Thanks for any input,
> > Anders
>
>
>
>
>
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
--
Regards,
Heinz -- The LVM Guy --
*** Software bugs are stupid.
Nevertheless it needs not so stupid people to solve them ***
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Heinz Mauelshagen Sistina Software Inc.
Senior Consultant/Developer Am Sonnenhang 11
56242 Marienrachdorf
Germany
Mauelshagen at Sistina.com +49 2626 141200
FAX 924446
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