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Using 8-stream multiplexing I see around 35-55MB/s per drive on a single
LTO2 drive.
=20
________________________________
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of Paul
Keating
Sent: Wednesday, June 29, 2005 7:54 AM
To: Veritas List
Subject: [Veritas-bu] minimum number of tape drives
=20
Just as a quick survey,.....based on number of clients, regardless of
drive type, speed, etc,
=20
What would any of you consider a MINIMUM number of tape drives for an
environment with ~100 network based clients and 2 TB of data?? 200
clients and 4 TB? 400 clients and 8 TB?
=20
I'm not looking for minimum number of drive to backup x terabytes of
data, in y hours, as that is more just math, and how fast a drive will
stream data, assuming your clients can push it fast enough.
=20
I'm looking more for what you would feel comfortable with, knowing that
a job(s) can hang due to Windows Open File Backup tanking, or a tape
getting stuck in a drive, or a large job failing at the last minute and
having to be restarted, or a SCSI error downing a drive, etc, etc.
=20
Paul
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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'>Using 8-stream multiplexing I see =
around
35-55MB/s per drive on a single LTO2 drive.<o:p></o:p></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'><o:p> </o:p></span></font></p>
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face=3D"Times New Roman"><span style=3D'font-size:12.0pt'>
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<p class=3DMsoNormal><b><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font =
size=3D2
face=3DTahoma><span style=3D'font-size:10.0pt;font-family:Tahoma'>
veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] <b><span =
style=3D'font-weight:
bold'>On Behalf Of </span></b>Paul Keating<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Wednesday, June 29, =
2005
7:54 AM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> Veritas List<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> [Veritas-bu] =
minimum
number of tape drives</span></font><o:p></o:p></p>
</div>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Just as a quick survey,.....based on number of =
clients,
regardless of drive type, speed, etc,</span></font><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>What would any of you consider a MINIMUM number of =
tape
drives for an environment with ~100 network based clients and 2 TB =
of
data?? 200 clients and 4 TB? 400 clients and 8 =
TB?</span></font><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>I'm not looking for minimum number of drive to backup =
x
terabytes of data, in y hours, as that is more just math, and how fast a =
drive
will stream data, assuming your clients can push it fast =
enough.</span></font><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>I'm looking more for what you would feel comfortable =
with,
knowing that a job(s) can hang due to Windows Open File Backup tanking, =
or a
tape getting stuck in a drive, or a large job failing at the last minute =
and
having to be restarted, or a SCSI error downing a drive, etc, =
etc.</span></font><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Paul</span></font><o:p></o:p></p>
</div>
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