Peter Dow wrote: > > Hi Brad, > > Maybe I misunderstood something -- I had the impression your product mimics > a tape drive. In which case the AS400 only sees what you let it see, and if > you unzip the data before passing it to the AS400, how would it know it's > zipped? I can do that already. People are telling that theere is an unzip function on the AS/400, which does not do me any good, since I won't be zipping or unzipping on the AS/400. The problem seems to be that you can restore from a multiple-cd save. > What exactly does your product do again? It does pretty much what you think. It looks like a tape file device that you can do SAVLIBs to, with a large hard drive area so you can mimick the functions of a tape library system. tape systems generally compress at 2 to 1, and the data compress option does up to 2 to 1, whereas the PC can compress up to 16 to 1. So you can create a CD that could store (theoretically) up to 10.8 GB of data from an AS/400, and duplicate it in five minutes, for about 50 cents. The media is cheap enough that you don't have to reuses it, and compact enough to store, and longer life than anything magnetic. It's feasible to have duplicate backups, or triplicate backups, with offsite storage. And it should run faster than a speeding tape drive. Most of the time you will be backing up to RAM, not disk, and then writing to disk while the AS/400 is 'thinking'. No rewind, no file mark seek time. And of course, no tape swapping, and no tape library robotics to break. Mechanical stuff breaks much more often than electronic stuff. Unattended backups - you can even load different 'virtual tape volumes'on the VTS with CL. Come in the next morning and write CDs. There's no tape head to get dirty or out of alignement, no tapes to break, or accidentally reuse. Like the guy said about the EMC memory - what are the consequences of it breaking once? The most likely thing to happen is that you will lose backuop data because a tape goes bad, or the head goes bad, or you accidentally reuse a tape before the exiration date, or you use it after the expiration date, but while you still really needed it. VTS with CD output avoides this. And of course, there is no reason that VTS system couldn't attach between your AS/400 and your SCSI tape drive - like a giant tape buffer. Write to the VTS in a fraction of the time, then write multiple backup tape copies to the tape drive. If the VTS ever goes bad, reconnect the tape drive directly to the AS/400. (You won't want to restore from the mag tape directly unless you have to - the VTS will be much faster on the restore because there is no seek, mutliple volume load, or rewind times. The problem is the people who want to restore from the CD to the AS/400 using the AS/400 CD drive, instead of the virtual tape system drive. You are correct in thinking that you can put the compressed CD int he virtual tape system CD drive, read it, and the VTS decompresses on the fly and present the information, uncompressed, to the AS/400 But you couldn't put a compressed CD int he AS/400's CD drive and read it. Sorry, I'm kind of thinking out loud here. -- Brad Jensen email@example.com President Electronic Storage Corporation Tulsa OK USA 918-664-7276 LaserVault Report Retrieval & Data Mining www.Laservault.com www.eufrates.com - Add distance learning to your site with easy course preparation
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