As an aside, my z/Appliance VTA/VTS has its own format that compresses then encrypts data for images at rest and in flight across TCP networks. We also provide tools to convert from several well known format to our format and back. We also added 128 bits of CRC on each block to ensure data integrity and prevent middleman alterations of the data. Our methods also reduced server disk service times because we shrink the data by as much as 75% which translates to less data going thru the disk drivers and the OS. This is unique to our server as we do not depend on the disk controller to cache and encrypt the data. Payback is large because when you retrieve the data it is passed in its smallest format, for reading or for mirroring to a DR site.
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