I'm trying to setup a Redhat Cluster that could be site disaster proof.
To illustrate this, see the diagram.
The nodes would service databases instances (not in a RAC fashion), or NFS services, each service running on one node at a time.
The principles would be to use Clustered LVM (CLVM) and LVM mirroring on top of it (though it does not yet support online resizing, and it still needs a 3rd device to carry the metadata).
The main question about this kind of setup (with RHCS) is about the quorum in case one of the 2 sites were to go down, the other site not having anymore the majority, the whole cluster would go down.
We are already managing a few hundreds of clusters this way using non RH (HP ServiceGuard) clustering software and it handles the site loss scenario by provinding a "out-of-cluster" tie-breaker on a 3rd site which guarantees a split-brain proof setup.
3 comments:
Hi,
CLVM, GFS2 and CMIRROR are not supported over multi-site cluster with RHCS; however RedHat recomend LVM mirror between 2 SAN, and to use a third node in second site, but I really looking for solution with DRBD+RHCS, in RHEL6 rgmanger and DRBD are integrated. :)
regards
Carlos Alberto Ramirez
karlox@linuxmail.org
Hi,
CLVM, GFS2 and CMIRROR are not supported over multi-site cluster with RHCS; however RedHat recomend LVM mirror between 2 SAN, and to use a third node in second site, but I really looking for solution with DRBD+RHCS, in RHEL6 rgmanger and DRBD are integrated. :)
regards
This seems interesting, would you say it'll be good for small businesses as well? Lately I've been hearing about more and more businesses getting caught off-guard and just losing all of their data. What a nightmare!
Post a Comment