I think you need to compute the price per byte, and I agree with you that tape is more cost effective. Although I might use removable disk media if it were removable and would be stored. Also tapes are written and read serially (with the exception of the ancient DECTapes). For backup purposes, I also think that tapes are less accident prone. I know a business where the computer operator who was supposed to backup disk to disk, used the backup disk and overwrote the production disk. They were down for a few days trying to rebuild their files, and they were a major food distributor in Atlanta, and many restaurants get daily deliveries. So, this caused a significant loss of business. BTW: This was an NCR system if that matters.
On 10/29/2014 06:09 PM, Richard Pieri wrote: > On 10/29/2014 2:54 PM, Nathan Burridge wrote: >> Have you looked into VMWare's Data Protection which is offered for free? > > Yeah... and I dismissed it based on the outright lies that make up the > ad copy: > > "Traditional data backup and data recovery solutions are expensive, > slow and complex." > > Fallacy 1: Expensive. No, they're not. A 16-slot rack-mount library > costs around $4K. Most of that is the drive itself; the loader > mechanism is cheap. LTO-6 cartridge prices have dropped to about $50 > each in bulk. That times 16 is $800 for each ~100TB of storage capacity. > > Fallacy 2: Slow. No. "Slow" isn't an absolute; it's relative to > something else. Certainly, magtape is slower than most rotating > platter media but that's irrelevant. It's part of a backup system. It > doesn't need to be the fastest thing going. It needs to be reliable > and the backup history depth needs to be scalable. > > Fallacy 3: Complex. This is all about horizontal scale. TSM is a > complex system but it needs to be in order to handle literally > thousands of simultaneous backup clients. A simple tape deck attached > to a small database server is no more complex than the shell script > that freezes the database, dumps it to disk, thaws the database, and > writes the dump to tape. > -- Jerry Feldman <[email protected]> Boston Linux and Unix PGP key id:B7F14F2F PGP Key fingerprint: D937 A424 4836 E052 2E1B 8DC6 24D7 000F B7F1 4F2F
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