Sun Study Shows 70% of Disk Storage Space Wasted

We've been working with Randy Chalfant to understand why disk storage space is under utilized (learn more in his blog blogs.sun.com/chalfantblog .

Typically there is far more storage available to users than they appreciate or understand. Sun completed a study performed at 200 user sites globally. In the study, tools were installed to uncover the allocation and utilization efficiency. The results were surprising:70% of disk space is wasted on average.
• 10% of all the capacity found had once been allocated to a server, but the server had gone away for various reasons, without the space been returned free. We define that as allocated but orphaned.
• 15% of all the capacity was allocated but unused. Typically someone had requested space from a storage administrator, but no file system or file was stored. It can also be represented as unused database table space.
• 5% of the space is inappropriate use. This is typically unstructured data commonly JPEG, MPEGS, WAV, AAC, etc., that should not be on the system.
• 40% of the space was inert. This was data that had not been referenced for six months or more.
• That left only 30% of the data been well used, along with some capacity for growth.

OK - so the idea that tape storage is dead becomes more of a fallacy with these findings.


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