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If you're dealing with a lot of small files it can increase backup
performance. Many small files do not usually stream fast to tape due to
metadata cataloguing, which can cause the drives to stop and start a
lot. Disk has no such issue.
=20
This is not to say it *will* improve performance, just that it might.
=20
I'm not familiar with CDL so have no opinion on it.
=20
~JK
=20
________________________________
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of Greenberg,
Katherine A
Sent: Thursday, November 10, 2005 1:51 PM
To: Hindle, Greg
Cc: Veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] Backups to disk, your opinion
=20
Personally, anything that comes from EMC is something of which I'm
wary... (not a fan! ;) )
=20
Disk backups won't necessarily improve performance. You have to take
into consideration the fact that disk drivers are written for random I/O
and that tape drivers are meant for streaming I/O, ergo, tape is better
for backup. However, it also depends on what you're comparing w/ disk,
from a tape perspective. If you have some old DLT 7000 drives that
you're comparing, disk will totally win, just by virtue of the fact that
the tape drives suck, however, if you're using an LTO III, tape will
probably beat out disk from a performance perspective.
=20
just my .02.
=20
~Kate
=20
=20
-----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 Hindle,
Greg
Sent: Thursday, November 10, 2005 3:36 PM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] Backups to disk, your opinion
Nbu 5.0 mp3 Solaris=20
We are looking into backing up to disk instead of tape. We have looked
at the EMC CDL solution. I am curious to know what other solutions
people are using and their opinions on what they use.
Greg=20
=20
>>> This e-mail and any attachments are confidential, may contain legal,
professional or other privileged information, and are intended solely
for the
addressee. If you are not the intended recipient, do not use the
information
in this e-mail in any way, delete this e-mail and notify the sender.
CEG-IP2
________________________________
This e-mail may contain confidential or privileged information. If you
think you have received this e-mail in error, please advise the sender
by
reply e-mail and then delete this e-mail immediately. Thank you.
Aetna=20
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<div class=3DSection1>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>If you’re dealing with a lot =
of
small files it can increase backup performance. Many small files =
do not
usually stream fast to tape due to metadata cataloguing, which can cause =
the
drives to stop and start a lot. Disk has no such =
issue.</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'> </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'>This is not to say it *<b><span
style=3D'font-weight:bold'>will</span></b>* improve performance, just =
that it
might.</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'> </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’m not familiar with CDL so =
have no
opinion on it.</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'> </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'>~JK</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'> </span></font></p>
<div>
<div class=3DMsoNormal align=3Dcenter =
style=3D'margin-left:.5in;text-align:center'><font
size=3D3 face=3D"Times New Roman"><span style=3D'font-size:12.0pt'>
<hr size=3D2 width=3D"100%" align=3Dcenter tabindex=3D-1>
</span></font></div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><b><font size=3D2 =
face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</spa=
n></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>Greenberg, =
Katherine
A<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Thursday, November =
10, 2005
1:51 PM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> Hindle, Greg<br>
<b><span style=3D'font-weight:bold'>Cc:</span></b>
Veritas-bu AT mailman.eng.auburn DOT edu<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> RE: [Veritas-bu] =
Backups
to disk, your opinion</span></font></p>
</div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> </span></font></p>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dblue
face=3DGeorgia><span =
style=3D'font-size:10.0pt;font-family:Georgia;color:blue'>Personally,
anything that comes from EMC is something of which I'm wary... (not =
a fan!
;) )</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dblue
face=3DGeorgia><span =
style=3D'font-size:10.0pt;font-family:Georgia;color:blue'>Disk
backups won't necessarily improve performance. You have to take into
consideration the fact that disk drivers are written for random I/O and =
that tape
drivers are meant for streaming I/O, ergo, tape is better for
backup. However, it also depends on what you're comparing w/ disk, =
from a
tape perspective. If you have some old DLT 7000 drives that you're =
comparing,
disk will totally win, just by virtue of the fact that the tape drives =
suck,
however, if you're using an LTO III, tape will probably beat out disk =
from a
performance perspective.</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dblue
face=3DGeorgia><span =
style=3D'font-size:10.0pt;font-family:Georgia;color:blue'>just
my .02.</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dblue
face=3DGeorgia><span =
style=3D'font-size:10.0pt;font-family:Georgia;color:blue'>~Kate</span></f=
ont></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
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</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> </span></font></p>
</div>
<div>
<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>
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>Hindle, =
Greg<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Thursday, November =
10, 2005
3:36 PM<br>
<b><span style=3D'font-weight:bold'>To:</span></b>
veritas-bu AT mailman.eng.auburn DOT edu<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> [Veritas-bu] =
Backups to
disk, your opinion</span></font></p>
</div>
<p style=3D'margin-left:.5in'><font size=3D2 face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial'><!-- Converted from text/rtf format -->Nbu 5.0 =
mp3
Solaris</span></font> </p>
<p style=3D'margin-left:.5in'><font size=3D2 face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial'>We are looking into backing up to disk instead =
of
tape. We have looked at the EMC CDL solution. I am curious to know what =
other
solutions people are using and their opinions on what they =
use.</span></font></p>
<p style=3D'margin-left:.5in'><font size=3D3 face=3D"Times New =
Roman"><span
style=3D'font-size:12.0pt'><br>
</span></font><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:
Arial'>Greg</span></font> <br>
<font face=3DArial><span =
style=3D'font-family:Arial'> </span></font> </p>
<pre style=3D'margin-left:.5in'><font size=3D2 face=3D"Courier =
New"><span
style=3D'font-size:10.0pt'>>>> This e-mail and any attachments =
are confidential, may contain legal,</span></font></pre><pre
style=3D'margin-left:.5in'><font size=3D2 face=3D"Courier New"><span
style=3D'font-size:10.0pt'>professional or other privileged information, =
and are intended solely for the</span></font></pre><pre
style=3D'margin-left:.5in'><font size=3D2 face=3D"Courier New"><span
style=3D'font-size:10.0pt'>addressee. If you are not the intended =
recipient, do not use the information</span></font></pre><pre
style=3D'margin-left:.5in'><font size=3D2 face=3D"Courier New"><span
style=3D'font-size:10.0pt'>in this e-mail in any way, delete this e-mail =
and notify the sender. CEG-IP2</span></font></pre>
<div class=3DMsoNormal align=3Dcenter =
style=3D'margin-left:.5in;text-align:center'><font
size=3D3 face=3D"Times New Roman"><span style=3D'font-size:12.0pt'>
<hr size=3D1 width=3D"100%" align=3Dcenter>
</span></font></div>
<p style=3D'margin-left:.5in'><strong><b><font size=3D3 face=3D"Times =
New Roman"><span
style=3D'font-size:12.0pt'>This e-mail may contain confidential or =
privileged
information. If you</span></font></b></strong><b><span =
style=3D'font-weight:bold'><br>
<strong><b><font face=3D"Times New Roman">think you have received this =
e-mail in
error, please advise the sender</font></b></strong><br>
<strong><b><font face=3D"Times New Roman">by</font></b></strong><br>
<strong><b><font face=3D"Times New Roman">reply e-mail and then delete =
this
e-mail immediately. Thank you.</font></b></strong><br>
<strong><b><font face=3D"Times New =
Roman">Aetna</font></b></strong><strong><b><font
face=3D"Times New Roman"> </font></b></strong></span></b></p>
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