[linux-lvm] lv not persistent across reboot?

[Heinz J. Mauelshagen]

Just recently i faced the efect with 2.4.0-test8, that devices where
exposed multiple times. For eg. /dev/sdb and /dev/sdf accessed the same drive.

Sent a message to linux-kernel.

Here's a temporary workaround for the LVM 0.8final library to deal
with this bug.


Please replace the loop block in tools/lib/pv_read_all_pv_of_vg.c
starting at line 84 by:

      for ( p = 0; pv_tmp != NULL && pv_tmp[p] != NULL; p++) {
         if ( pv_check_consistency ( pv_tmp[p]) < 0) continue;

         /* avoid dual access pathes for now (2.4.0-test8) */
         for ( i = 0; i < np; i++) {
            if ( pv_tmp[i] == NULL) continue;
            if ( strncmp ( pv_tmp[i]->vg_name, pv_tmp[p]->vg_name,
                           NAME_LEN) == 0 &&
                 pv_tmp[i]->pv_number == pv_tmp[p]->pv_number &&
                 strncmp ( pv_tmp[i]->pv_uuid, pv_tmp[p]->pv_uuid,
                           UUID_LEN) == 0) {
               free ( pv_tmp[p]);
               pv_tmp[p] = NULL;
               goto pass_end;
            }
         }

         if ( strcmp ( pv_tmp[p]->vg_name, vg_name) == 0) {
            if ( pv_number < pv_tmp[p]->pv_number)
               pv_number = pv_tmp[p]->pv_number;
            np++;
         }
pass_end:
      }


Gimme feedback if it works for you.

Regards,
Heinz      -- The LVM guy --

On Mon, Sep 25, 2000 at 04:52:40PM -0700, Tim Pepper wrote:
> I've set up a little test machine to play with lvm.  It's running RedHat 6.2
> with a 2.4-test8 kernel and lvm 0.8.
> 
> I've successfully created and used an lv (with a reiserfs filesystem on top
> of it).  My problem is that when I reboot the lv is gone.  vgscan finds
> nothing.  pvdisplay, lvdisplay and vgdisplay likewise show nothing.  If I go
> through the steps though to recreate the lvm, pvcreate seems to think
> something's there and wants me to do a '-ff'.  I can then continue on.
> 
> Playing around I see:
> 
> 	[root at qalab5 /root]# umount /mnt/nz
> 	
> 	[root at qalab5 /root]# lvdisplay /dev/netzero/big 
> 	--- Logical volume ---
> 	LV Name               /dev/netzero/big
> 	VG Name               netzero
> 	LV Write Access       read/write
> 	LV Status             available
> 	LV #                  1
> 	# open                0
> 	LV Size               34.18 GB
> 	Current LE            8750
> 	Allocated LE          8750
> 	Allocation            next free
> 	Read ahead sectors    120
> 	Block device          58:0
> 	
> 	[root at qalab5 /root]# vgscan
> 	vgscan -- reading all physical volumes (this may take a while...)
> 	vgscan -- no volume groups found
> 
> 	[root at qalab5 /root]# lvdisplay /dev/netzero/big 
> 	lvdisplay -- ERROR: VGDA in kernel and lvmtab are NOT consistent; please run
> 	vgscan
> 
> 	[root at qalab5 /root]# vgscan
> 	vgscan -- reading all physical volumes (this may take a while...)
> 	vgscan -- no volume groups found
> 	
> 	[root at qalab5 /root]# mount /mnt/nz
> 
> I can't seem to display it, but it does remount here.
> 
> I was thinking that maybe the 'vgchange -a n' shouldn't be done or perhaps I
> was doing it at the wrong time (at shutdown after the filesystem on the lv was
> umounted), but the above seems flakey even without vgchange in the picture.
> 
> Any ideas what could be going on?  Thanks in advance for any help.
> 
> Tim
> 
> --
> *********************************************************
> *  tim.pepper at opensales dot com     * Venimus, Vidimus, *
> *  http://www.opensales.com         * Dolavimus         *
> *********************************************************

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Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Bartningstr. 12
                                                  64289 Darmstadt
                                                  Germany
Mauelshagen at Sistina.com                           +49 6151 7103 86
                                                       FAX 7103 96
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