drbd 8.4.x contains compatibility executables drbdsetup-83 and
drbdadm-83, which are exec()'d if the userland detects that the kernel
is running drbd 8.3.
However there is a case where this doesn't seem to be compatible.
"ganeti" issues the following drbdsetup command:
drbdsetup /dev/drbd2 disk
/dev/xenvg/a614fd3b-d016-44a1-a6d6-c51334190757.disk0_data
/dev/xenvg/a614fd3b-d016-44a1-a6d6-c51334190757.disk0_meta 0 -e detach
--create-device -d 1024m
This is accepted (silently, exitcode 0) by drbdsetup from 8.3.10. It's
also accepted if you pass it explicitly to /lib/drbd/drbdsetup-83.
However if you pass this to drbdsetup in 8.4 it is rejected with a
"USAGE: drbdsetup command device arguments options" error. So the
frontend drbdsetup is rejecting this command *before* giving it to
drbdsetup-83.
Regards,
Brian.
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