[linux-lvm] lv not persistent across reboot?

[Steve Brueggeman]

Does this imply that Linux LVM will also have problems with discs in H.A.
configurations? 

For example: Fibre Channel drives have two ports on them.  If I have a Linux box
with two Host Adapters, and each adapter is connected to the same set of drives,
but on different ports, will v0.8final (without the patch below) have unstable
vgscans?

I have not been following the high availability mailing list, and a solution may
already exist  there.  If so, and you know how, I'd be interested in a quick
description.

Later,

Steve Brueggeman

On Tue, 26 Sep 2000 11:35:21 +0000, you wrote:

>
>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         *
>> *********************************************************
>
>=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
>
>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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