We want to move all the data to central storage. The SAN should be accessible from Dell/IBM/HP server and Unix/Windows/Linux/Tru64 supporting.
We're also looking for a SAN cluster -- online backup for SAN, so that if one SAN fails, our users can access another SAN in a different location, connected by fiber cable.
Knowing answers to these and other questions should help you to characterize which storage solutions would best fit your storage needs. There are many different products from different vendors, including those you mentioned (DELL, HP, IBM) as well as EMC, HDS, STK and Sun among others. In addition to looking at products, you will also want to consider connectivity options between the SANs, possibly including inter-fabric routing for isolation and segmentation. You should also keep in mind which management software and toolset you will use to manage this environment. How will what the software be integrated with all of the other storage components for the target environment? If you are looking for some specific criteria and features to look for in a storage subsystems and management software take a look at www.evaluatorgroup.com/workbooks.
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