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ROI on a SAN implementation depends on a number of factors. There are many white papers available from most of the SAN vendors that cover this in greater detail than I can here.
Here are some of the things that need to be taken into account when determining ROI:
1-Increased Disk Utilization (DAS=<40% where SAN=>80%!)
2-Deferring Disk Procurement
3-Terabytes (TB)-per-Administrator Improvement
4-Reduce Data Center Rack/Floor Space
5-Deferring Tape Library Procurement
6-New Disaster Recovery (DR) Capabilities
7-On-line Recoverability Options
8-Improved Data Path Availability
9-Reduction of General-purpose UNIX (r) and Microsoft (r)Windows NT (r)
Servers
10-Improve LAN/WAN Performance, Avoid Upgrades
11-Reduce/Eliminate Backup Servers
12-Reduce/Eliminate Batch, Backup Windows
13-Storage on Demand
You can find more info on this timely subject at: http://www.hds.com/pdf/3SAN_ROI_Wht_Ppr.pdf
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