Comment #11 on issue 787 by [email protected]: DRBD sync problems after
downgrade from DRBD 8.4 to 8.3
http://code.google.com/p/ganeti/issues/detail?id=787
Regarding sync speed:
Did you modify the DRBD related disk parameters?
Please run a `gnt-cluster info` and look at 'resync-rate'
and/or 'dynamic-resync' and related parameters (see `man gnt-cluster` for
more details). Changing those parameters might only affect instances as
soon as they are restarted.
Ganeti configures DRBD devices with external metadata (flexible external
metadata for 8.4 IIRC). A separate meta data LV is created alongside the
data LV by Ganeti when the DRBD device is created. This meta data disk is
initialized anew aswell, so there shouldn't be a problem with stale data.
You can, however, try to zero out the meta data disk generated by Ganeti
and see if this changes anything (the disks can be found under
/dev/xenvg/<instance_uuid>_meta.disk).
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