Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
We'd like to be able to make backups from our DRBD secondary by mounting the underlying filesystems. After some searching, this appears to be a relatively common discussion: running DRBD on top of LVM, making a snapshow of the backing LV on the secondary, and mounting the snapshot LV. As has been discussed, it's not perfect, but it should produce reasonable results most of the time, at least no worse than if there had been a power failure. So, I'm sorry if this is a silly question, but I can't seem to get this to work. It appears that DRBD permanently prevents mounting the backing device (or its snapshot) because "drbdadm create-md" function modifies the filesystem so that it can no longer be mounted except via the /dev/drbdX device. In particular, attempting to mount a snapshot, or detaching DRBD from the backing device and attempting to mount the file system, or even just attempting to mount the backing device after create-md has run, results in: mount: unknown filesystem type 'drbd' I see that the general concensus is that "it should work fine", so it seems like there must be some simple explanation. Fyi,we're using Ubuntu 10.04 which loads DRBD version 8.3.7. Thanks for your assistance, lew