On Wed, Sep 12, 2012 at 7:19 PM, Bernardo Dal Seno <bdals...@google.com> wrote: > Partitioned Ganeti allows to assign node resources in an exclusive manner, > in order to limit interference between instances running on the same nodes. > > Signed-off-by: Bernardo Dal Seno <bdals...@google.com> > > > This design includes and supersedes the previous designs about node > slicing and lvmvg disks. This is mostly the result of discussions in > front of a whiteboard, so there is no record of the development so far > of this document, though we had a few iterations. Sorry for that.
One sentence rewritten, to make it more clear: diff --git a/doc/design-partitioned.rst b/doc/design-partitioned.rst index 1829b6b..bb0233b 100644 --- a/doc/design-partitioned.rst +++ b/doc/design-partitioned.rst @@ -35,9 +35,9 @@ and ``drbd``. The name is generic enough in case the feature w extended to other back-ends. Ganeti will consider each physical volume in the destination volume -group as a host disk (as such care must be exercised when partitioning -those disks, to avoid having more than one PV on them, for proper -isolation). When ``exclusive_storage`` is enabled in a node group, all PVs +group as a host disk (for proper isolation, an administrator should +make sure that there aren't multiple PVs on the same physical +disk). When ``exclusive_storage`` is enabled in a node group, all PVs in the node group must have the same size (within a certain margin, say 1%, defined through a new parameter). Ganeti will check this condition when the ``exclusive_storage`` flag is set, whenever a new node is added --- Bernardo
