[DRBD-user] existing volume

Lars Ellenberg lars.ellenberg at linbit.com
Mon Jul 12 09:50:02 CEST 2010

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

On Sat, Jul 10, 2010 at 02:32:59PM -0600, Mike Lovell wrote:
> i want to say that drbd can detect changes to the underlying block
> devices and do the needful. but i don't know for sure. to be safe,
> one should consider that any changes to the underlying block device,
> such as the those that happen with volume being mounted RW, are not
> replicated through drbd automatically. before the secondary server
> can be used, one would need to re-do the mounts on the master, force
> a sync, and wait for the sync to complete. drbdadm invalidate on the
> secondary or invalidate_remote on the primary can be used for force
> a full resync.

As long as you directly access the underlying block device
there is absolutely no point in using DRBD.

Actually, if you _mount_ the underlying device,
DRBD cannot even attach it.

To use DRBD, you have to, well, use DRBD.

: Lars Ellenberg
: LINBIT | Your Way to High Availability
: DRBD/HA support and consulting http://www.linbit.com

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