[linux-lvm] vgscan fails to find volume groups

Heinz J . Mauelshagen mauelshagen at sistina.com
Wed Apr 17 10:50:02 UTC 2002


can you access /dev/sdb while running the below part of your startup script?
IOW: is the Adaptec driver present then and does it work properly?

Heinz    -- The LVM Guy --

On Wed, Apr 17, 2002 at 03:53:02AM -0400, Jason A. Fager wrote:
> I have been attempting to get LVM set up on a freshly-installed
> Slackware 8.0 system (custom 2.4.18 monolithic kernel, LVM 1.0.3,
> no kernel patches).  It works fine in multi-user mode, it works
> fine in single-user mode, however I set up the single-user init
> script like this:
> (/ is mounted read only at this point)
> mount -o remount,rw /
> vgscan
> vgchange -a y
> mount -o remount,ro /
> (stock Slackware fsck and mount bits)
> The only volume group I have contains one physical volume
> (/dev/sdb, on an Adaptec 7xxx controller).  For some reason,
> vgscan doesn't pick up the volume group.  The exit code is 0,
> and looking at the debug output it hits /dev/sdb and spits out
> the same messages as when it hits all the other devices.
> As an experiment I put a call to sulogin before the vgscan and
> tried running it by hand; same thing happened.  I tried running
> pvcreate (on the whole disk, and after creating an LVM partition
> /dev/sdb1) and it failed with error code 7.
> As another experiment, I tried setting up a loopback filesystem
> on a file in the root directory.  That worked perfectly; vgscan
> picked it up, vgchange activated it, and the rest of the init
> script ran fsck and mounted it.  Other than setting up the
> loopback file the only thing I did was add a call to losetup
> before the vgscan.
> Not sure if this is a problem with the kernel (i.e. SCSI driver)
> or a problem with LVM, or some boneheaded thing I'm doing wrong.
> Any advice you can give would be appreciated -- let me know if
> I can provide more information.
> thanks,
> jafager
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*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***


Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                  56242 Marienrachdorf
Mauelshagen at Sistina.com                           +49 2626 141200
                                                       FAX 924446

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