1000 clients on 5 NW servers but only about 250GB for the index disks? This 
sounds weird but obviously does not consider a long retention at all.

My goal would be to have 500 clients max. per data zone. Just to minimize 
administration. We run such an environment.
Your HW parameters sound reasonable.

Remember that the server is only the controlling tool. Yes a lot of processes 
need some CPU power (and more RAM) but the workhorses are the SNs.

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