[Veritas-bu] 4 LTO Tape Drives

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=20

I would be careful about about the assumption that 4 LTO streams will
fit on a gig-e.  I have seen sustained rates of 26+ MB/sec in a
Gig-e/SAN environment, and there is significant overhead with IP that is
not present with SCSI/FC.

=20

  Mark

=20

-----Original Message-----
From: jonw AT n2h2 DOT com [mailto:jonw AT n2h2 DOT com]=20
Sent: Thursday, March 06, 2003 11:37 AM
To: Mark.Donaldson AT experianems DOT com; Karl.Rossing AT Federated DOT CA;
veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] 4 LTO Tape Drives

=20

Keep in mind that your PCI bus could also become a bottleneck.   If you
plan to move all that SCSI and network traffic though a single, 32-bit
PCI bus, you will probably saturate it.   Hopefully you have a 64-bit
PCI bus and cards or multiple PCI busses . (or other HW architecture
that supports this type of throughput)

-----Original Message-----
From: Donaldson, Mark [mailto:Mark.Donaldson AT experianems DOT com]
Sent: Thursday, March 06, 2003 8:11 AM
To: 'Karl.Rossing AT Federated DOT CA'; veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] 4 LTO Tape Drives

LTO has a native speed of 15 MB/sec.  I've never seen ours burst past 25
MB/sec.  So your Gigabit ethernet should be able to drive all four
drives at max speed.

LVD SCSI is only good for 80MB/sec - I'd recommend two busses with two
tape drives each.=20

$.02=20
-M=20

-----Original Message-----=20
From: Karl.Rossing AT Federated DOT CA [mailto:Karl.Rossing AT Federated DOT 
CA]=20
Sent: Thursday, March 06, 2003 8:53 AM=20
To: veritas-bu AT mailman.eng.auburn DOT edu=20
Subject: [Veritas-bu] 4 LTO Tape Drives=20

=20

I'm thinking of getting a StorageTek L40 library with 4 LVD LTO1 tape=20
drives.=20

We don't run a SAN. We do network backups. Our backbone is a 1GB fiber.=20

Can the 1GB fiber master server drive the 4 LTO1 drives at full speed?=20
What has your experience been?=20

Thanks,=20

Karl=20
_______________________________________________=20
Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu=20
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu=20


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<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>I would be careful about about the
assumption that 4 LTO streams will fit on a gig-e.&nbsp; I have seen =
sustained rates
of 26+ MB/sec in a Gig-e/SAN environment, and there is significant =
overhead
with IP that is not present with SCSI/FC.</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>&nbsp; Mark</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>&nbsp;</span></font></p>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma'>-----Original =
Message-----<br>
<b><span style=3D'font-weight:bold'>From:</span></b> jonw AT n2h2 DOT com
[mailto:jonw AT n2h2 DOT com] <br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Thursday, March 06, =
2003
11:37 AM<br>
<b><span style=3D'font-weight:bold'>To:</span></b>
Mark.Donaldson AT experianems DOT com; Karl.Rossing AT Federated DOT CA;
veritas-bu AT mailman.eng.auburn DOT edu<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> RE: [Veritas-bu] =
4 LTO
Tape Drives</span></font></p>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'>&nbsp;</span></font></p>

<div>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dblue face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;color:blue'>Keep in mind =
that your
PCI bus could also become a bottleneck.&nbsp;&nbsp; If you plan to move =
all
that SCSI and network traffic though a single, 32-bit PCI bus, you will
probably saturate it.&nbsp;&nbsp; Hopefully you have a 64-bit PCI bus =
and cards
or multiple PCI busses . (or other HW architecture that supports this =
type of
throughput)</span></font></p>

</div>

<blockquote =
style=3D'margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>

<p class=3DMsoNormal =
style=3D'margin-right:0in;margin-bottom:12.0pt;margin-left:
.5in'><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'>-----Original
Message-----<br>
<b><span style=3D'font-weight:bold'>From:</span></b> Donaldson, Mark
[mailto:Mark.Donaldson AT experianems DOT com]<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Thursday, March 06, =
2003
8:11 AM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> =
'Karl.Rossing AT Federated DOT CA';
veritas-bu AT mailman.eng.auburn DOT edu<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> RE: [Veritas-bu] =
4 LTO
Tape Drives</span></font></p>

<p style=3D'margin-left:.5in'><font size=3D2 face=3D"Times New =
Roman"><span
style=3D'font-size:10.0pt'>LTO has a native speed of 15 MB/sec.&nbsp; =
I've never
seen ours burst past 25 MB/sec.&nbsp; So your Gigabit ethernet should be =
able
to drive all four drives at max speed.</span></font></p>

<p style=3D'margin-left:.5in'><font size=3D2 face=3D"Times New =
Roman"><span
style=3D'font-size:10.0pt'>LVD SCSI is only good for 80MB/sec - I'd =
recommend two
busses with two tape drives each.</span></font> </p>

<p style=3D'margin-left:.5in'><font size=3D2 face=3D"Times New =
Roman"><span
style=3D'font-size:10.0pt'>$.02</span></font> <br>
<font size=3D2><span style=3D'font-size:10.0pt'>-M</span></font> </p>

<p style=3D'margin-left:.5in'><font size=3D2 face=3D"Times New =
Roman"><span
style=3D'font-size:10.0pt'>-----Original Message-----</span></font> <br>
<font size=3D2><span style=3D'font-size:10.0pt'>From: =
Karl.Rossing AT Federated DOT CA [<a
href=3D"mailto:Karl.Rossing AT Federated DOT 
CA">mailto:[email protected]=
A</a>]</span></font>
<br>
<font size=3D2><span style=3D'font-size:10.0pt'>Sent: Thursday, March =
06, 2003 8:53
AM</span></font> <br>
<font size=3D2><span style=3D'font-size:10.0pt'>To:
veritas-bu AT mailman.eng.auburn DOT edu</span></font> <br>
<font size=3D2><span style=3D'font-size:10.0pt'>Subject: [Veritas-bu] 4 =
LTO Tape
Drives</span></font> </p>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'>&nbsp;</span></font></p>

<p style=3D'margin-left:.5in'><font size=3D2 face=3D"Times New =
Roman"><span
style=3D'font-size:10.0pt'>I'm thinking of getting a StorageTek L40 =
library with
4 LVD LTO1 tape </span></font><br>
<font size=3D2><span style=3D'font-size:10.0pt'>drives.</span></font> =
</p>

<p style=3D'margin-left:.5in'><font size=3D2 face=3D"Times New =
Roman"><span
style=3D'font-size:10.0pt'>We don't run a SAN. We do network backups. =
Our
backbone is a 1GB fiber.</span></font> </p>

<p style=3D'margin-left:.5in'><font size=3D2 face=3D"Times New =
Roman"><span
style=3D'font-size:10.0pt'>Can the 1GB fiber master server drive the 4 =
LTO1
drives at full speed? </span></font><br>
<font size=3D2><span style=3D'font-size:10.0pt'>What has your experience =
been?</span></font>
</p>

<p style=3D'margin-left:.5in'><font size=3D2 face=3D"Times New =
Roman"><span
style=3D'font-size:10.0pt'>Thanks,</span></font> </p>

<p style=3D'margin-left:.5in'><font size=3D2 face=3D"Times New =
Roman"><span
style=3D'font-size:10.0pt'>Karl</span></font> <br>
<font size=3D2><span =
style=3D'font-size:10.0pt'>______________________________________________=
_</span></font>
<br>
<font size=3D2><span style=3D'font-size:10.0pt'>Veritas-bu =
maillist&nbsp; -&nbsp;
Veritas-bu AT mailman.eng.auburn DOT edu</span></font> <br>
<font size=3D2><span style=3D'font-size:10.0pt'><a
href=3D"http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu"; =
target=3D"_blank">http://mailman.eng.auburn.edu/mailman/listinfo/veritas-=
bu</a></span></font>
</p>

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