[linux-lvm] vgscan fails to find volume groups

[linux-lvm] vgscan fails to find volume groups

[Jason A. Fager]

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

Re: [linux-lvm] vgscan fails to find volume groups

[AJ Lewis]

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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.

Hrm...you're root is mounted read-write, so the /etc directory should be
able to be updated by the tools.  Do you have /proc mounted at this point?
I'm assuming the SCSI driver is loaded at this point as well...Can't think
of anything else off the top of my head that would be wrong with that...

I'll see if I can reproduce on a system I have.

Regards,
-- 
AJ Lewis
Sistina Software Inc.                  Voice:  612-638-0500
1313 5th St SE, Suite 111              E-Mail: lewis@sistina.com
Minneapolis, MN 55414
http://www.sistina.com

Current GPG fingerprint =  7792 2F3E 9D86 DA4C 9111 7837 982D 737B 9DBC 4EC9
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Re: [linux-lvm] vgscan fails to find volume groups

[Heinz J . Mauelshagen]

Jason,

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?

Regards,
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
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html

*** 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@Sistina.com                           +49 2626 141200
                                                       FAX 924446
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