[DRBD-user] drbd 8.0pre5 Lower device is already mounted

[Jeff Fisher]

>> I cant set it up because drbdadm always states that the device is
>> already mounted. I know that the kernel may claim the device or anything
>> else but I didn't find anything and I deactivated the volumes with evmsn
>> management tool but it stays the same. The two machines are connected vi
>> a private gigabit link for drbd.

> Could you please retry with this pach:
> 
> phil at mescal:~/src/drbd08/drbd$ svn diff
> Index: drbd_nl.c
> ===================================================================
> --- drbd_nl.c   (revision 2482)
> +++ drbd_nl.c   (working copy)
> @@ -671,6 +671,8 @@
> 
>         nbc->backing_bdev = inode->i_bdev;
>         if (bd_claim(nbc->backing_bdev, mdev)) {
> +               WARN("Backing device hold by: %s\n",
> +                    nbc->backing_bdev->bd_holder);
>                 retcode=LDMounted;
>                 goto fail;
>         }
> 

I'm having the same issue but with drbd 8.0pre6 running under Xen 3.0.3
(2.6.16.29-xen_3.0.3.0).

I setup /dev/VolGroup00/drbdtest, which is 2gigs and I created the
metadata. I setup the drbd.conf and tried to start drbd and this is what
happens:

[root at xen2(~)]: modprobe drbd
[root at xen2(~)]: drbdadm -v up all
drbdsetup /dev/drbd0 disk /dev/VolGroup00/drbdtest
/dev/VolGroup00/drbdtest internal --set-defaults --create-device
--on-io-error=detach
Failure: (114) Lower device is already mounted.
Command 'drbdsetup /dev/drbd0 disk /dev/VolGroup00/drbdtest
/dev/VolGroup00/drbdtest internal --set-defaults --create-device
--on-io-error=detach' terminated with exit code 10

So I patched DRBD and this is the error in the kernel log:

Dec  5 08:40:22 xen2 kernel: drbd0: Backing device hold by:

To be sure my line is right, here is my patched code:

        if (bd_claim(nbc->backing_bdev, mdev)) {
                WARN("Backing device hold by: %s\n",
nbc->backing_bdev->bd_holder);
                retcode=LDMounted;
                goto fail;
        }

Thanks,
Jeff

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