> Small question regarding the underlying disk > > If on the primary, and I started drbd on a disk with existing data, > > some time later I unmount and I down drbd.... > > Can I directly mount the disk again without risk of corruption? or once drbd > always drbd?
This is safe so long as you don't write (if you intend to reform the DRBD resource) but beware even mounting some filesystems with `-o ro` can still result in writes. You can add a generic step to prevent this by creating a loop device from the block device: # losetup -Pfvr --show /dev/.... # ls /dev/loop1* /dev/loop1 /dev/loop1p1 /dev/loop1p2 # mount /dev/loop1p2 /tmp/x Error opening '/dev/loop1p2' read-write Could not mount read-write, trying read-only (That happened to be an NTFS formatted partition from a virtual machine) If you do write to the disk and bypass drbd then you'll need to invalidate the secondary and resync. James
