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Several things to look at first are:
=20
number and size of files, buffer sizes (yes they are still an issue in 8
& 9), duplicity on the NICs (don't auto negotiate), frame sizes, etc.
=20
=20
Thank you,
=20
=20
Samuel J. Coco, STG
Functional Area Manager, ARL
Sr UNIX Administrator
BELL 301 394-1151 DSN 290
CELL (B) 240 398-7121 / (H)443 496-1623
HOME 410 604-2415
Email scoco AT arl.army DOT mil
-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of Rob De
Langhe
Sent: Wednesday, June 30, 2004 1:35 AM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] max throughput of 20 Mbit per sec to tape ...
Hi,
=20
we run backups to an LTO library, single tape drive, so expected to be
able to render at least 10 Mbyte per sec of data sent to the tape. What
we see in the job-details is an max throughput of about 2.5 Mbyte per
sec, regardless of the client that is sending its data to the backup
server.
=20
The network topology is such that many clients are separated from the
backup server by a firewall, which could be a cause for the slower
network throughput.
=20
But when the backup is being taken of a fileserver that sits on the same
network segment as the backup server (so without intermediate firewall),
we get still the same throughput of 2.5MBps.
=20
I do not see any collisions on the network interface of the backup
server, so I do not suspect a saturated network link.
=20
How can we diagnose the place where the throughput is being slowed down
?=20
All boxes (server and client) are Solaris-9 hosts, backup server is
SUN-SF280R, link to L25 robot is Ultra-SCSI (supposedly to give me max
of 80 MBps, no?)
=20
TIA
=20
Rob
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<DIV><SPAN class=3D700463210-30062004><FONT face=3DArial color=3D#0000ff =
size=3D2>Several things to look at first are:</FONT></SPAN></DIV>
<DIV><SPAN class=3D700463210-30062004><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D700463210-30062004><FONT face=3DArial color=3D#0000ff =
size=3D2>number=20
and size of files, buffer sizes (yes they are still an issue in 8 & =
9),=20
duplicity on the NICs (don't auto negotiate), frame sizes,=20
etc.</FONT></SPAN></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV align=3Dleft><FONT face=3DArial size=3D2>Thank you,</FONT></DIV>
<DIV align=3Dleft><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV align=3Dleft> </DIV>
<DIV align=3Dleft><FONT face=3DArial size=3D2>Samuel J. Coco, =
STG</FONT></DIV>
<DIV align=3Dleft><FONT face=3DArial size=3D2>Functional Area Manager,=20
ARL</FONT></DIV>
<DIV align=3Dleft><FONT face=3DArial size=3D2>Sr UNIX =
Administrator</FONT></DIV>
<DIV align=3Dleft><FONT face=3DArial size=3D2>BELL =
301=20
394-1151 DSN 290</FONT></DIV>
<DIV align=3Dleft><FONT face=3DArial size=3D2>CELL (B) 240 398-7121 / =
(H)443=20
496-1623</FONT></DIV>
<DIV align=3Dleft><FONT face=3DArial =
size=3D2>HOME 410=20
604-2415</FONT></DIV>
<DIV align=3Dleft><FONT face=3DArial size=3D2>Email <A=20
href=3D"mailto:scoco AT arl.army DOT mil">scoco AT arl.army DOT
mil</A></FONT></DIV>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
<DIV></DIV>
<DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr =
align=3Dleft><FONT=20
face=3DTahoma size=3D2>-----Original Message-----<BR><B>From:</B>=20
veritas-bu-admin AT mailman.eng.auburn DOT edu=20
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] <B>On Behalf Of =
</B>Rob De=20
Langhe<BR><B>Sent:</B> Wednesday, June 30, 2004 1:35 AM<BR><B>To:</B>=20
veritas-bu AT mailman.eng.auburn DOT edu<BR><B>Subject:</B> [Veritas-bu]
max=20
throughput of 20 Mbit per sec to tape ...<BR><BR></FONT></DIV>
<DIV><FONT face=3DArial size=3D2><SPAN=20
class=3D156382805-30062004>Hi,</SPAN></FONT></DIV>
<DIV><FONT face=3DArial size=3D2><SPAN=20
class=3D156382805-30062004></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2><SPAN class=3D156382805-30062004>we =
run backups to=20
an LTO library, single tape drive, so expected to be able to render at =
least=20
10 Mbyte per sec of data sent to the tape. What we see in the =
job-details is=20
an max throughput of about 2.5 Mbyte per sec, regardless of the client =
that is=20
sending its data to the backup server.</SPAN></FONT></DIV>
<DIV><FONT face=3DArial size=3D2><SPAN=20
class=3D156382805-30062004></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2><SPAN class=3D156382805-30062004>The =
network=20
topology is such that many clients are separated from the backup =
server by a=20
firewall, which could be a cause for the slower network=20
throughput.</SPAN></FONT></DIV>
<DIV><FONT face=3DArial size=3D2><SPAN=20
class=3D156382805-30062004></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2><SPAN class=3D156382805-30062004>But =
when the=20
backup is being taken of a fileserver that sits on the same network =
segment as=20
the backup server (so without intermediate firewall), we get still the =
same=20
throughput of 2.5MBps.</SPAN></FONT></DIV>
<DIV><FONT face=3DArial size=3D2><SPAN=20
class=3D156382805-30062004></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2><SPAN class=3D156382805-30062004>I do =
not see any=20
collisions on the network interface of the backup server, so I do not =
suspect=20
a saturated network link.</SPAN></FONT></DIV>
<DIV><FONT face=3DArial size=3D2><SPAN=20
class=3D156382805-30062004></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2><SPAN class=3D156382805-30062004>How =
can we=20
diagnose the place where the throughput is being slowed down ?=20
</SPAN></FONT></DIV>
<DIV><FONT face=3DArial size=3D2><SPAN class=3D156382805-30062004>All =
boxes (server=20
and client) are Solaris-9 hosts, backup server is SUN-SF280R, link to =
L25=20
robot is Ultra-SCSI (supposedly to give me max of 80 MBps,=20
no?)</SPAN></FONT></DIV>
<DIV><FONT face=3DArial size=3D2><SPAN=20
class=3D156382805-30062004></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2><SPAN=20
class=3D156382805-30062004>TIA</SPAN></FONT></DIV>
<DIV><FONT face=3DArial size=3D2><SPAN=20
class=3D156382805-30062004></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2><SPAN=20
=
class=3D156382805-30062004>Rob</SPAN></FONT></DIV></BLOCKQUOTE></BODY></H=
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