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Subject: comparison of dd write on FreeBSD 6.2, FreeBSD 4.11, Red Hat Enterprise Linux 3
Date: Fri, 14 Sep 2007 11:06:55 -0800
Message-ID: <BB375AF679D4A34E9CA8DFA650E2B04E0587B3A7@onstor-exch02.onstor.net>
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Thread-Topic: comparison of dd write on FreeBSD 6.2, FreeBSD 4.11, Red Hat Enterprise Linux 3
Thread-Index: Acf3AmphTRvdoHkaTGy8v7gHRIUzFA==
From: "Fay Chong" <fay.chong@onstor.com>
To: "Andy Sharp" <andy.sharp@onstor.com>,
	"Eric Barrett" <eric.barrett@onstor.com>,
	"Maxim Kozlovsky" <maxim.kozlovsky@onstor.com>,
	"Jonathan Goldick" <jonathan.goldick@onstor.com>,
	"Paul Hammer" <paul.hammer@onstor.com>,
	"Brian Montero" <brian.montero@onstor.com>,
	"John Rogers" <john.rogers@onstor.com>,
	"Brian Baker" <brian.baker@onstor.com>,
	"Brian DeForest" <brian.deforest@onstor.com>
Cc: "Fay Chong" <fay.chong@onstor.com>

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Hi,
Here is the dd statement:
dd if=3D/dev/zero of=3D/mnt/vol1/iobw.tst bs=3D128m count=3D400

Looking at vsvr stat agg the bandwidths were:

FreeBSD 6.2			15-16MB/sec
FreeBSD 4.11  			35-36MB/sec
Red Hat Enterprise Linux 3	64-65MB/sec

Yahoo specifies FreeBSD 4.11 or 6. FreeBSD 4.11 is being installed on
two clients for Yahoo testing.

Comments, suggestions, questions welcome.

Thanks
Fay


Fay Chong
Sr. Performance Engineer
ONStor, Inc.
fay.chong@onstor.com
408.376.3130 (w)



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<TITLE>comparison of dd write on FreeBSD 6.2, FreeBSD 4.11, Red Hat =
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<P ALIGN=3DLEFT><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">Hi,</FONT></SPAN></P>

<P ALIGN=3DLEFT><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial">Here =
is the dd statement:</FONT></SPAN></P>

<P ALIGN=3DLEFT><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial">dd =
if=3D/dev/zero of=3D/mnt/vol1/iobw.tst bs=3D128</FONT></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">m</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial"> =
count=3D400</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"></SPAN></P>

<P ALIGN=3DLEFT><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">Looking at vsvr stat agg the bandwidths =
were:</FONT></SPAN></P>

<P ALIGN=3DLEFT><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">FreeBSD 6.2&nbsp;&nbsp;&nbsp;&nbsp;</FONT></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"> =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"> <FONT SIZE=3D2 =
FACE=3D"Arial">15-16MB/sec</FONT></SPAN></P>

<P ALIGN=3DLEFT><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">FreeBSD</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial"> 4.11&nbsp; =
&nbsp;</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"> =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"> <FONT SIZE=3D2 =
FACE=3D"Arial">35-36MB/sec</FONT></SPAN></P>

<P ALIGN=3DLEFT><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial">Red =
Hat Enterprise Linux 3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
64-65MB/sec</FONT></SPAN></P>

<P ALIGN=3DLEFT><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial">Yahoo =
specifies FreeBSD 4.11 or 6.</FONT></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"> <FONT SIZE=3D2 =
FACE=3D"Arial">FreeBSD</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial"> 4.11 is being installed on =
two clients for Yahoo testing.</FONT></SPAN></P>

<P ALIGN=3DLEFT><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">Comments, suggestions,</FONT></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"> <FONT SIZE=3D2 =
FACE=3D"Arial">questions</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial"> welcome.</FONT></SPAN></P>

<P ALIGN=3DLEFT><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">Thanks</FONT></SPAN></P>

<P ALIGN=3DLEFT><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">Fay</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"></SPAN></P>
<BR>

<P ALIGN=3DLEFT><SPAN LANG=3D"en-us"></SPAN><A NAME=3D""><SPAN =
LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial">Fay =
Chong</FONT></SPAN></A></P>

<P ALIGN=3DLEFT><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial">Sr. =
Performance Engineer</FONT></SPAN></P>

<P ALIGN=3DLEFT><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">ONStor, Inc.</FONT></SPAN></P>

<P ALIGN=3DLEFT><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">fay.chong@onstor.com</FONT></SPAN></P>

<P ALIGN=3DLEFT><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">408.376.3130 (w)</FONT></SPAN></P>

<P ALIGN=3DLEFT><SPAN LANG=3D"en-us"></SPAN></P>

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