Indexing - replication

Hello all,

Looking for field experiences.EV11.0.1CHF5

2 physical indexing servers in each Datacenter, 2 Datacenters. the 4 servers are in one Index Server Group. Each indexing server has several disks attached, hosting an indexvolume. Each disk is replicated to a counterpart in the other DC.

If anyone uses this kind of scenario, how do you replicate the data? storage based tool? 3rd party tool? other options? Reason for asking is that we did a DR test, where 2 servers ran the whole indexing for 7 days (without issues!). After return to normal, I now have many failed indexes/missing items. To me this indicates replication is an issue :-)...

Your thoughts are appreciated.

GJ