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Vol. 6 No. 10 December 2007

Tracking down those missing bytes

A reader of Storage magazine recently wrote to say he had purchased an Imation Odyssey with 80GB and 160GB cartridges (removable hard disk drives) to back up one of his computers. He was surprised to find several gigabytes of capacity missing. Then he spoke with a storage architect who told him he discovered only 41TB of storage space existed on a new enterprise array that was expected to deliver 45TB. It's a common problem and one that prompts the question: Who took a byte, megabyte, gigabyte or terabyte out of my storage, and where did it go? Should I blame the disk vendors, or the server and software vendors? There are two main reasons for the discrepancy between what's advertised and what you get. One has to do with rounding up numbers and the other with how the storage is configured. Disk drive manufacturers use base 10 (decimal) to count bytes of data, while memory chip, server and operating system vendors typically use base 2 (binary) to count bytes of data. This can lead to confusion when comparing a disk drive base 10GB...

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Features in this issue

  • Talking up server virtualization, security at SNW

  • VTL data management issues

    As disk libraries become the primary backup target for near-term data recoveries, storage managers are exploring new ways to exploit tape's high capacity, low cost and mobility. Disk is the best medium for fast backups and recoveries, and many companies have turned to virtual tape libraries as a way to put disk in their backup process. On the surface, it may seem easy to implement a VTL, but there are many subtle operational issues that must be dealt with to ensure that your data can be recovered quickly when needed.

  • Snapshot: Will you adopt LTO-4?

Columns in this issue