Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!emory!hubcap!ncrcae!nncrcae!wescott
From: wescott@Columbia.NCR.COM (Mike Wescott)
Newsgroups: comp.sys.ncr
Subject: Re: The 8mm Gigabyte Gap
Message-ID: <1991Feb23.175824.537@nncrcae.Columbia.NCR.COM>
Date: 23 Feb 91 22:58:24 GMT
References: <343@gandp>
Organization: NCR Corp
Lines: 19
Nntp-Posting-Host: micky

In article <343@gandp> rg@gandp.UUCP (Dick Gill) writes:
> The backup is run from crontab and uses cpio in a script that
> has worked for me for years. (I did have to remove blocking
> through dd to get it to run with the drive)

> To get a better handle on the problem, I said:
> 
>                   dd if=/dev/rmt/1yy of=/dev/null
> 
> and, when I got the results 6 hours later, guess what?  EOF
> occurs at about 1.5 GB; got the same result with another new
> tape! Is this right? Where is the missing 0.6 GB of capacity?

Possibly, the blocking factor is too small and to keep streaming
the exabyte pads with extra blocks (actually rewrites blocks).
The same thing happens with streaming tapes.
--
	-Mike Wescott
	 mike.wescott@ncrcae.Columbia.NCR.COM


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