[linux-lvm] Howto Make LVM Work With NBD/ENBD?

[Heinz J . Mauelshagen]

On Mon, Apr 29, 2002 at 03:22:36PM +0200, Csan (Ja'nos Hola'nyi) wrote:
> Hi Ning,
> 
> I had similar problems with exactly the same ERROR message.
> I figure this is lvm10...?
> In that case, please check if _noprocdir[] and _devdir[] sections in
> LVM/1.0.3/tools/lib/lvm_dir_cache.c contain the line:
> 
>         LVM_DIR_PREFIX "nb",

FYI: have replaced that nasty hard-coded device spec in LVM1 CVS by
     an environment variable configurable approach.

export LVM_DEVICES="sdb;sdc;nb:0"

will just use /dev/sd[bc]* (16 partitions by default)
and /dev/nb* (0 partitions).

Without that environment variable, defaults like in earlier versions
are used.

Regards,
Heinz    -- The LVM Guy --

> 
> If not, insert, make (in LVM/1.0.3/), make install and it should work.
> 
> If you're on Debian, you could also check out the APT archives at
> 
> deb http://people.debian.org/~patrick unstable main
> 
> and install lvm10 from there (they're OK also for Debian 3.0 woody). That
> package already contains these fixes.
> 
> (BTW, I am actually building a HA cluster with DRBD+LVM. DRBD uses nbd.
> Currently there are some issues on the standby node - LV detection not working
> yet -, but we're slowly getting there. The active node has ext3fs on the LV, and
> the replication works great... so far.)
> 
> Best regards,
> 
> Csan
> 
> PS: thanks for the above fixes go to "ejt" and "pjc" guys on #lvm
> (irc.openprojects.net)
> Please CC: me if you're replying as I am not subscribed to the list.
> 
> Quoting Ning Ye <nye at csee.wvu.edu>:
> 
> > Hi!,
> > 
> >     I want to make them work together, which makes me crazy these days. 
> > 
> > 
> >     I can initialize the disks and partitions exported by ENBD, but when
> > trying to create a volume group on it, vgcreate fails.
> > # vgcreate my_volume /dev/ndb
> > vgcreate -- ERROR "pv_read(): read" reading physical volumes
> >     After examine the debug output, it looks to me lvm trying to
> > enumerate all physical disks present to the system.  These disks include
> > SCSI disks(sda...), IDE disks(hda...) and loops(loop0...).  However, the
> > LVM will not recognize the exported disk as a physical one.
> > 
> >     Did any one ever make it work before?  I would like to know before I
> > am trying to look into the code.  Combining these two great packages
> > would be wonderful.  But how?  Help needed.  Thanks.
> > 
> >                 Ning
> > 
> > 
> 
> 
> 
> Csan
> 
> János Holányi
> Association of Hungarian Linux Users
> Email: csani at lme.linux.hu
> 
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*** 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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