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Can a Microsoft Storeage Server 2003 replace my NetApp SAN with 2000 MSCS sharing out a UNC?

Last Modified: 2013-11-14
We currently use MS 2000 Clustering Service for 2 UNC shares that absolutely need to be up 24X7.  The Clustering Service is attached to a 140Gb NetApp LUN.  We either need to buy another NetApp OR find another way to make a UNC share rock solid and up 24X7.  The UNC share will have millions files and will grow to 500Gb or larger and will have heavy access.  It is for a third party mail server which is clustered, load balanced, and keeps it's mail in that LUN.  Will MSS2003 (Microsoft Storeage Server) work for this?  Can I cluster the data using VSS to another machine and have some sort of MS clustering or failover policy in case the MSS2003 server crashes?  What are options for having a UNC share up 99.999%?
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Yes, that is what i was thinking about a manual failover (re-IP the server) in case of catastrophy.  It is heavy usage.  15,000 POP email accounts and each email is stored and delivered as a single file.  I am not exactly sure of the I/O, but it will be fairly heavy.

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