[DRBD-user] Setting up per-VM LVM volumes as individual DRBD mirrors - compatible?

Whit Blauvelt whit+drbd at transpect.com
Fri Oct 26 01:54:07 CEST 2012

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


Knocks self up side the head. Had been before. But wasn't.

Yes, that fixes it.

Best,
Whit

On Thu, Oct 25, 2012 at 05:36:46PM -0400, Vadym Chepkov wrote:
> Is your DRBD device in "primary" state?
> 
> Cheers,
> Vadym
> 
> On Oct 25, 2012 12:34 PM, "Whit Blauvelt" <whit+drbd at transpect.com> wrote:
> 
>     On Thu, Oct 25, 2012 at 11:39:14AM -0400, Vadym Chepkov wrote:
>     >
>     > On Oct 25, 2012, at 11:23 AM, Whit Blauvelt wrote:
>     > > I should be able to stop the domain, change the middle line using
>     "virsh
>     > > edit" to:
>     > >
>     > >       <source dev='/dev/drbdN'/>
>     > >
>     >
>     >
>     > I would use a different path:
>     >
>     > /dev/drbd/by-res/vmN
>     >
>     > Easier to spot an error and you might change the device number, but name
>     will still be the same.
> 
>     Good suggestion. Thanks.
> 
>     The easy road appears to be blocked, though. with this edited XML:
> 
>         <disk type='block' device='disk'>
>           <driver name='qemu' type='raw'/>
>           <source dev='/dev/drbd/by-res/sql'/>
>           <target dev='hda' bus='ide'/>
>           <address type='drive' controller='0' bus='0' target='0' unit='0'/>
>         </disk>
> 
>     the result is:
> 
>       # virsh start sql
>       error: Failed to start domain sql
>       error: unable to open disk path /dev/drbd/by-res/sql: Wrong medium type
> 
>     This is with virsh 0.9.12. Also fails when skipping the symlink: <source
>     dev='/dev/drbd12'/>
>     leads to exactly the same failure. Either I'm missing another tweak, or
>     this
>     setup isn't currently compatible.
> 
>     Whit
> 
> 
> 
> 
> 



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