177 lines
5.1 KiB
Plaintext
177 lines
5.1 KiB
Plaintext
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.\" Copyright (c) 1983 The Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)abs.ms 6.2 (Berkeley) 4/16/91
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.\"
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.if n .ND
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.TL
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Performance Effects of Disk Subsystem Choices
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for VAX\(dg Systems Running 4.2BSD UNIX*
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.sp
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Revised July 27, 1983
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.AU
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Bob Kridle
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.AI
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mt Xinu
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2560 9th Street
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Suite #312
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Berkeley, California 94710
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.AU
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Marshall Kirk McKusick\(dd
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.AI
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Computer Systems Research Group
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Computer Science Division
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Department of Electrical Engineering and Computer Science
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University of California, Berkeley
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Berkeley, CA 94720
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.AB
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.FS
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\(dgVAX, UNIBUS, and MASSBUS are trademarks of Digital Equipment Corporation.
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.FE
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.FS
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* UNIX is a trademark of Bell Laboratories.
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.FE
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.FS
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\(ddThis work was supported under grants from
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the National Science Foundation under grant MCS80-05144,
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and the Defense Advance Research Projects Agency (DoD) under
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Arpa Order No. 4031 monitored by Naval Electronic System Command under
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Contract No. N00039-82-C-0235.
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.FE
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Measurements were made of the UNIX file system
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throughput for various I/O operations using the most attractive currently
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available Winchester disks and controllers attached to both the
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native busses (SBI/CMI) and the UNIBUS on both VAX 11/780s and VAX 11/750s.
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The tests were designed to highlight the performance of single
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and dual drive subsystems operating in the 4.2BSD
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.I
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fast file system
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.R
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environment.
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Many of the results of the tests were initially counter-intuitive
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and revealed several important aspects of the VAX implementations
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which were surprising to us.
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.PP
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The hardware used included two Fujitsu 2351A
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``Eagle''
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disk drives on each of two foreign-vendor disk controllers
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and two DEC RA-81 disk drives on a DEC UDA-50 disk controller.
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The foreign-vendor controllers were Emulex SC750, SC780
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and Systems Industries 9900 native bus interfaced controllers.
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The DEC UDA-50 controller is a UNIBUS interfaced, heavily buffered
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controller which is the first implementation of a new DEC storage
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system architecture, DSA.
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.PP
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One of the most important results of our testing was the correction
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of several timing parameters in our device handler for devices
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with an RH750/RH780 type interface and having high burst transfer
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rates.
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The correction of these parameters resulted in an increase in
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performance of over twenty percent in some cases.
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In addition, one of the controller manufacturers altered their bus
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arbitration scheme to produce another increase in throughput.
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.AE
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.LP
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.de PT
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.lt \\n(LLu
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.pc %
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.nr PN \\n%
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.tl '\\*(LH'\\*(CH'\\*(RH'
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.lt \\n(.lu
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..
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.af PN i
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.ds LH Performance
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.ds RH Contents
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.bp 1
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.\".if t .ds CF July 27, 1983
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.\".if t .ds LF CSRG TR/8
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.\".if t .ds RF Kridle, et. al.
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.ce
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.B "TABLE OF CONTENTS"
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.LP
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.sp 1
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.nf
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.B "1. Motivation"
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.LP
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.sp .5v
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.nf
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.B "2. Equipment
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2.1. DEC UDA50 disk controller
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2.2. Emulex SC750/SC780 disk controllers
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2.3. Systems Industries 9900 disk controller
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2.4. DEC RA81 disk drives
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2.5. Fujitsu 2351A disk drives
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.LP
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.sp .5v
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.nf
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.B "3. Methodology
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.LP
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.sp .5v
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.nf
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.B "4. Tests
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.LP
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.sp .5v
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.nf
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.B "5. Results
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.LP
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.sp .5v
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.nf
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.B "6. Conclusions
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.LP
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.sp .5v
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.nf
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.B Acknowledgements
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.LP
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.sp .5v
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.nf
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.B References
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.LP
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.sp .5v
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.nf
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.B "Appendix A
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A.1. read_8192
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A.2. write_4096
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A.3. write_8192
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A.4. rewrite_8192
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.ds RH Motivation
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.af PN 1
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.bp 1
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.de _d
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.if t .ta .6i 2.1i 2.6i
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.\" 2.94 went to 2.6, 3.64 to 3.30
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.if n .ta .84i 2.6i 3.30i
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..
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.de _f
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.if t .ta .5i 1.25i 2.5i
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.\" 3.5i went to 3.8i
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.if n .ta .7i 1.75i 3.8i
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..
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