Path: utzoo!attcan!uunet!lll-winken!lll-tis!ames!pasteur!ucbvax!hplabs!hpda!hp-sde!hpfcdc!bayes
From: bayes@hpfcdc.HP.COM (Scott Bayes)
Newsgroups: comp.sys.mac
Subject: Re: Tape backup systems
Message-ID: <11010026@hpfcdc.HP.COM>
Date: 13 Jun 88 16:16:05 GMT
References: <145@ditsyda.oz>
Organization: HP Ft. Collins, Co.
Lines: 23

>My dream backup machine and software request.
>
>capacity 1GByte in file format not image format.
>media	 DAT or 8mm video tape.
>speed 	 2 Mbytes per minute.

At 2MB/minute, backing up the full GB will take over 8 hours. That's
a pretty slow rate (2MB/min = approx 33 KB/sec). I should hope a modern
backup technology would come nearer 100 to 200 KB/sec; don't forget you've
probably got both the disc and the backup device on the same bus, sharing
its total bandwidth, and 1 CPU (no DMA :-( ) to do the job. But still, 
150 KB/sec seems reasonable, and would reduce your 1GB backup to approx
1-1/2 to 2 hours.

>
>
>		jim sadler
>		206-656-5422
>		hpubvwa!b-mrda!jim
>		P.O. Box 3707 MS 6R-24
>		Seattle, Wa. USA 98124

Scott Bayes - an impatient type
bayes@hpfclw