Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uflorida!haven!mimsy!chris
From: chris@mimsy.UUCP (Chris Torek)
Newsgroups: comp.unix.questions
Subject: Re: speed of dump
Message-ID: <16665@mimsy.UUCP>
Date: 1 Apr 89 15:16:50 GMT
References: <13622@sequent.UUCP>
Distribution: usa
Organization: U of Maryland, Dept. of Computer Science, Coll. Pk., MD 20742
Lines: 22

(Don Speck should really answer this one...)

In article <13622@sequent.UUCP> roc@sequent.UUCP (Ron Christian) writes:
>Is 4.3 BSD dump any faster than 4.2 BSD dump in driving the tape drive?

Yes.

>Are there faster possibilities that retain the functionality of dump?

Yes.  Most of them involve kernel hacks.  One that does not:  If the
disks are sufficiently full, and you have sufficient real memory (say
32+ MB), you could make a version of dump that reads entire cylinder
groups into memory.  If your transfer rate is substantially higher than
your seek time%, this will help for all but the largest files on most
Unix machines.  (If the disks are not very full, this will slow things
down instead.)

-----
% well, you know what I mean :-)
-- 
In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 7163)
Domain:	chris@mimsy.umd.edu	Path:	uunet!mimsy!chris