RA81 speeds (was Re: magtape, and what's hot)

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Article #1120

#1120

From: Chris Torek
Date: Sun, 10 May 1987 19:13

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In article <161@auvax.UUCP> rwa@auvax.UUCP writes:
>Ok, I just did that.  "dump 0f /dev/null /dev/rra1h & iostat 1".
>...  Iostat reported average transfer rates in the 290 Kb/s to
>350 Kb/s range.  /dev/ra1h is an 8k/1k filesystem of about 360
>megabytes.  The main hack here was to set the burst-transfer counts
>higher.

I reran my statistics, since I think my old 130K/s max was with
the hardware default DMA burst rate.  On a Vax 8600 running
4.3BSD-beta-plus and the driver I posted in April, with the UDA50
on its own Unibus (the standard 8600 configuration), I got 150 to
220 KB/s.  We have 4K/512 filesystems, though, which explains the
difference.

>... how did you get your eagles to go so fast?

Well, I did use tunefs, but nothing else special.
-- 
In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 7690)
Domain:	chris@mimsy.umd.edu	Path:	seismo!mimsy!chris

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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: arc1-ca.pugleaf.net!utzoo!mnetor!seismo!mimsy!chris
From: chris@mimsy.UUCP (Chris Torek)
Newsgroups: comp.sys.misc,comp.periphs,comp.unix.wizards
Subject: RA81 speeds (was Re: magtape, and what's hot)
Message-ID: <6612@mimsy.UUCP>
Date: Sun, 10-May-87 15:13:30 EDT
Article-I.D.: mimsy.6612
Posted: Sun May 10 15:13:30 1987
Date-Received: Mon, 11-May-87 02:47:53 EDT
References: <878@wjvax.wjvax.UUCP> <242@uwslh.UUCP> <6567@mimsy.UUCP> <161@auvax.UUCP>
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Organization: U of Maryland, Dept. of Computer Science, Coll. Pk., MD 20742
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