|
What kind of data replication will be
used? Regards, Alfredo From:
linux-cluster-bounces@xxxxxxxxxx [mailto:linux-cluster-bounces@xxxxxxxxxx] On Behalf Of brem belguebli Hi, Any idea or comment on this. Thanks Brem CF link attached to diagram that describes the setup. 2009/8/21, brem belguebli <brem.belguebli@xxxxxxxxx>:
Hi, I'm trying to find out what best fencing solution could fit a dual
sites cluster. Cluster is equally sized on each site (2 nodes/site), each site hosting
a SAN array so that each node from any site can see the 2 arrays. Quorum disk (iscsi LUN) is hosted on a 3rd site. SAN and LAN using the same telco infrastructure (2 redundant
DWDM loops). In case something happens at Telco level (both DWDM loops are broken)
that makes 1 of the 2 sites completely isolated from the rest of the world, the nodes at the good site (the one still operationnal) won't be able
to fence any node from the wrong site (the one that is isolated) as there is no
way for them to reach their ILO's or do any SAN fencing as the switches at
the wrong site are no more reachable. As qdiskd is not reachable from the wrong nodes, they end up being
rebooted by qdisk, but there is a short time (a few seconds) during which
the wrong nodes are still seing their local SAN array storage and may
potentially have written data on it. Any ideas or comments on how to ensure data integrity in such setup ? Regards Brem |
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