enrico-sorichetti wrote:are You aware of many gigabytes, or maybe better terabytes of data are being backed up in an average organization
Fortunately, your beliefs don't count.I belive HDD or Flash dive have more capacity than a Tape.
Robert Sample wrote:Fortunately, your beliefs don't count.I belive HDD or Flash dive have more capacity than a Tape.
A mainframe tape can contain up to 900 GB of data (for a 3592 tape in compressed mode). The largest flash drive I'm aware of that can be purchased is 256 GB -- less than one-third of the capacity of this tape. Even when the 512 GB flash drives come out, it's still be barely half the capacity of this tape.
Our site is a small site and we have 2.5 TB (2500 GB) of disk drives avaiable to the mainframe. Large sites are starting to approach petabytes (1,000 TB or 1,000,000 GB) of disk data. The cost to back this up to disk (doubling the disk space required) or flash (problematic to start with since mainframes do not have USB ports on them) would be prohibitive -- especially since a mainframe supports up to 255 tape volumes per backup file.
3590 and 3590E tape cartridges
Browse and buy
IBM 3590 Extended High-Performance Cartridge Tape continues the IBM focus on tape technology by doubling the length and providing twice the capacity of IBM 3590 High-Performance Cartridge Tape. These tape products increase the data storage capacity of half-inch cartridge tape. In addition, both types of cartridges can reside in the same physical space as IBM 3490 cartridges; they can also coexist in an IBM TotalStorage Enterprise Tape Library 3494.
Capacity (native)3590 - 10/20/30GB 3590E - 20/40/60GB
Capacity (compressed)3590 - 30/60/90GB 3590E - 60/120/180GB
What a difference 40 years makes. In 1971 I was visiting a site that had a 2321 data cell machine. 400 megabytes! I mentioned this to our guide, and was immediately corrected, "no, 200 megabytes. We have to backup everything!"Robert Sample wrote:... The cost to back this up to disk (doubling the disk space required) ...