From owner-FreeBSD-users-jp@jp.freebsd.org  Wed Dec 24 17:31:09 1997
Received: by jaz.jp.freebsd.org (8.8.8+3.0Wbeta7/8.7.3) id RAA18668
	Wed, 24 Dec 1997 17:31:09 +0900 (JST)
Received: by jaz.jp.freebsd.org (8.8.8+3.0Wbeta7/8.7.3) with ESMTP id RAA18662
	for <freebsd-users-jp@jp.freebsd.org>; Wed, 24 Dec 1997 17:31:08 +0900 (JST)
Received: from ryo1123.aist-nara.ac.jp (ryo1123.aist-nara.ac.jp [163.221.150.32]) by mailgate2.aist-nara.ac.jp (8.8.5+2.7Wbeta5/3.5Wpl5/NAIST/GATE-2.2) with ESMTP id RAA24550 for <freebsd-users-jp@jp.freebsd.org>; Wed, 24 Dec 1997 17:31:06 +0900 (JST)
Received: from ryo1123.aist-nara.ac.jp by ryo1123.aist-nara.ac.jp (8.8.8/2.7W-KASA/1.5)
	id IAA00900; Wed, 24 Dec 1997 08:31:05 GMT
Message-Id: <199712240831.IAA00900@ryo1123.aist-nara.ac.jp>
To: FreeBSD-users-jp@jp.freebsd.org
In-reply-to: Your message of "Wed, 24 Dec 1997 16:08:42 JST."
             <19971224160842J.simokawa@sat.t.u-tokyo.ac.jp> 
Date: Wed, 24 Dec 1997 17:31:04 +0900
From: Takuya Koumoto <takuya-k@is.aist-nara.ac.jp>
Reply-To: FreeBSD-users-jp@jp.freebsd.org
Precedence: bulk
X-Distribute: distribute [version 2.1 (Alpha) patchlevel=24]
X-Sequence: FreeBSD-users-jp 22768
Subject: [FreeBSD-users-jp 22768] Re: Expmt. Concatinated Disk driver. 
Errors-To: owner-FreeBSD-users-jp@jp.freebsd.org
Sender: owner-FreeBSD-users-jp@jp.freebsd.org


$B9CK\$G$9!#(B

> $B2<@n!wElBg$G$9(B.
> 
> $B;d$b(B, 1$BG/$0$i$$$^$($K(B2Gx8$B$0$i$$$N(BCCD$B$G$$$m$$$mM7$s$G$_$?$0$i$$(B
> $B$G(B, $B$7$C$+$jDjNLE*$KD4$Y$?$o$1$G$O$"$j$^$;$s$,(B.

$B;d$N6a$/$K$O(B DISK $B$,>/$J$$$N$G!"$=$&$$$&<B83$,A4A3$G$-$J$$$N(B
$B$G!"Hs>o$K;29M$K$J$j$^$9!#(B

> $B$H$7$F$b(B, $BBgNL$N(Bsequential$B$J(Bread/write$B$G$O(B($B7`E*$J(B)$B8z2L$O$J$$$N(B
> $B$G$O$H;W$$$^$9(B.

$B$=$&$G$9$M!#;d$N$O(B P5-133 512KB $B$J$N$G$9$,(B PCI $B0JA0$K!"(B

% dd if=/dev/zero of=/dev/zero bs=1m count=1000
1048576000 bytes transferred in 8.956876 secs (117069390 bytes/sec)

% dd if=/dev/zero of=/dev/zero bs=128k count=10000
1310720000 bytes transferred in 11.447785 secs (114495511 bytes/sec)

$B$J$N$G!"$I$&$K$b$J$j$^$;$s$M!#(B

# P2 $B$N?M$O$b$C$HHa$7$/$J$k$+$b(B :-p

$B$G$O!"%i%s%@%`%"%/%;%9$O$I$&$+$H$$$&$H!"(B

  IBM Ultrastar $B$G(B async mount $B$J$iJ86g$J$$$J$!(B

$B$H$$$&$N$,@5D>$J$H$3$m$G$9(B(^^;$B!#(B

> 80MB/s$B6a$/$N(Bflow$B$r(Bkeep$B$G$-$k(Bcontroller$B$C$F$H$F$b$9$4$$(B
> $B$/$F9b$$$N$G$O$J$$$N$+$J$H;W$$$^$9(B. ($B$D$$$G$K(Bparity$B$^$G7W;;$7$?$j(B)

$B$"!"$A$J$_$K!"(BRAID $B%3%s%H%m!<%i$H$$$&$b$N$r8+$?$3$H$J$$$N$G(B
$B$9$,!"(B

PC SCSI I/F <- UltraWideSCSI -> RAID <- (UltraWide)SCSI -> HDD
               ^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^
               $B$3$N(B 2 $B$D$N%P%9$OJL$l$F$$$k$N$G$9$h$M(B?

$B$&!A$s!"3N$+$K(B RAID $B%3%s%H%m!<%i$,$h$C$]$I9b@-G=$G$J$1$l$P0U(B
$BL#$J$5$=$&$J5$$,!#!#!#(B

> IDE$B$O$"$^$j;H$C$?$3$H$O$J$$$N$G$h$/$o$+$j$^$;$s$,(B,
> 10MB/s$B$N;~Be$G$"$l$P(B, BUS$B$rA}$9$3$H$K$h$C$F7`E*$J8z2L$,F@$i$l$?$+(B
> $B$b$7$l$^$;$s$,(B, $B$$$^$O$=$l$[$I$N8fMx1W$O$J$5$=$&$J5$$,$7$F$$$^$9(B.

$B0JA0!"(BIDE $B$r;}$C$F$$$?$3$m!"(BSCSI HDD <-> SCSI HDD $B$h$j(B IDE
HDD <-> SCSI HDD $B$NJ}$,=hM}$,2wE,$@$C$?$h$&$J5-21$,$"$k$N$G(B
$B$9!#(B

$B$_$J$5$s$N$*OC$r$&$+$,$C$F$_$k$H!"(BRAID $B$OBg6b$rEjF~$7$F$^$G(B
$B$d$k$[$I$N2ACM$O$J$$$h$&$J5$$,$7$^$9$M!#$`$7$m!"(B

  $B$R$H$D$N%3%s%H%m!<%i$K%G%#%9%/$O$R$H$D(B

$B$rL\;X$9J}$,NI$5$=$&$G$9$M!#(B
---
