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Alright...I work for ADIC who has their own VTL. I'll give you my
perspective as unbiased as possible. Many can attest on this list prior
to joining ADIC I've been talking / addressing the value of disk based
backup and VTLs for quite some time.
=20
See my comments inline.
=20
Incidentally you can access the Micro-site for our product at
http://www.adic.com/gopathlightvx
=20
David A. Chapa | ADIC | 720.272.8452 cell | http://www.adic.com
<http://www.adic.com> =20
Sr. Technical Advisor=20
Pathlight VX - http://www.adic.com/gopathlightvx
=20
=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
Chewning.Bruce
Sent: Wednesday, February 09, 2005 2:49 PM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] VTL questions
=20
We have been looking at Virtual Tape Libraries and I have a few
questions to ask those who have used them.
1. Should you let the VTL make copies to tape or insist that a media
server write to tape.=20
If you are facing an exposure issue with getting your backup media
offsite via duplication / vaulting, then you may want to look at letting
the VTL create your media. I say this with one very BIG caveat. You
want to ensure that you #1 have enough bandwidth on the back end of your
Virtual Tape Library to ensure you can create tapes in accordance with
your window for physical tape creation. #2 you want to make sure that
the barcodes in your physical library are synchronized to your virtual
cartridges on the VTL's disk. Automation of the barcode synchronization
is best, manual is okay but requires a higher degree of touch and
management. #3 If you allow the VTL to create your physical tape you
also want to ensure that you are allowed to use the physical tape as a
COPY for DR, in other words allow you to separate the physical from the
virtual. So now you have an online copy still (virtual) and a DR copy
offsite (separated physical).
=20
2. When you selected your VTL, how did you compare them? How did you
size the VTL you chose?
We have a tool our field uses to help size the VTL, however, I would
suggest that you look at how much data you plan on backing up, how many
copies you need online for high speed recovery and how many media are
required (physical) so you can adequately size your "backend" library.=20
=20
3. Why do some docs say sometimes restoring from tape can be faster than
restoring from the VTL.
I've not heard this one. I would love to read some of those writings.
=20
4. How are you maximizing performance with VTL? What strategies are you
using for large amounts of data.
I've done all of the performance testing for our offering (Pathlight VX)
and ran through performance testing the same way I would have done with
conventional tape (bptm and bpbkar logging). I ended up with 256K block
size (UNIX) and approximately 64 data buffers.
=20
5. Does multiple streams still make sense?
Multiple streams make sense, but multiplexing doesn't necessarily, based
on your LAN / SAN infrastructure. The nice thing about VTLs is you are
able to send data to individual tape drives as fast or as slow as your
servers can afford. However the other side of the coin is you may not
have licenses for ALL of the tape drives necessary to avoid
multiplexing. So at that point it may be for your environment, MPX is
right, but perhaps you can reduce the number of MPX streams. This would
really be a tuning disucsion.
=20
6. What tools are you managing your VTL with?=20
We have a browser based interface.
=20
=20
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<body lang=3DEN-US link=3Dblue vlink=3Dpurple =
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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'>Alright…I work for ADIC who =
has
their own VTL.<span style=3D'mso-spacerun:yes'> </span>I’ll =
give you
my perspective as unbiased as possible.<span =
style=3D'mso-spacerun:yes'>
</span>Many can attest on this list prior to joining ADIC I’ve =
been talking
/ addressing the value of disk based backup and <span =
class=3DSpellE>VTLs</span>
for quite some time.<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>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>See my comments =
inline.<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>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Incidentally you can access the =
Micro-site
for our product at <a =
href=3D"http://www.adic.com/gopathlightvx";>http://www.adic.com/gopathligh=
tvx</a><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>
<div>
<p><font size=3D1 color=3Dnavy face=3D"Arial Black"><span =
style=3D'font-size:7.5pt;
font-family:"Arial =
Black";mso-bidi-font-family:Arial;color:navy;mso-no-proof:
yes'>David A. Chapa</span></font><span
class=3DStyleNormalWebLatinArialComplexArial75ptChar><font size=3D1 =
color=3Dnavy
face=3DArial><span =
style=3D'font-size:7.5pt;color:navy;mso-no-proof:yes'> | =
</span></font></span><font
size=3D1 color=3Dred face=3D"Arial Black"><span =
style=3D'font-size:7.5pt;font-family:
"Arial =
Black";mso-bidi-font-family:Arial;color:red;mso-no-proof:yes'>ADIC</span>=
</font><span
class=3DStyleNormalWebLatinArialComplexArial75ptChar><font size=3D1 =
color=3Dnavy
face=3DArial><span =
style=3D'font-size:7.5pt;color:navy;mso-no-proof:yes'> |
720.272.8452 cell | </span></font></span><font color=3Dnavy =
face=3DArial><span
style=3D'font-family:Arial;color:navy;mso-no-proof:yes'><a
href=3D"http://www.adic.com";><font size=3D1><span =
style=3D'font-size:7.5pt'>http://www.adic.com</span></font></a></span></f=
ont><font
size=3D1 color=3Dnavy><span =
style=3D'font-size:7.5pt;color:navy;mso-no-proof:yes'> <br>
</span></font><span =
class=3DStyleNormalWebLatinArialComplexArial75ptChar><font
size=3D1 color=3Dnavy face=3DArial><span =
style=3D'font-size:7.5pt;color:navy;
mso-no-proof:yes'>Sr. Technical Advisor</span></font></span><font =
size=3D1
color=3Dnavy><span =
style=3D'font-size:7.5pt;color:navy;mso-no-proof:yes'> =
<o:p></o:p></span></font></p>
<p><font size=3D1 color=3Dred face=3D"Arial Black"><span =
style=3D'font-size:7.5pt;
font-family:"Arial =
Black";mso-bidi-font-family:Arial;color:red;mso-no-proof:
yes'>Pathlight VX – =
http://www.adic.com/gopathlightvx<o:p></o:p></span></font></p>
<p><font size=3D1 color=3Dnavy face=3D"Times New Roman"><span =
style=3D'font-size:7.5pt;
color:navy;mso-no-proof:yes'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D3 color=3Dnavy face=3D"Times New =
Roman"><span
style=3D'font-size:12.0pt;color:navy;mso-no-proof:yes'><o:p> </o:p><=
/span></font></p>
</div>
<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>
<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>
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>Chewning.Bruce<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Wednesday, February =
09, 2005
2:49 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] VTL
questions</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'><o:p> </o:p></span></font></p>
<div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>We have been looking at =
Virtual Tape
Libraries and I have a few questions to ask those who have used =
them.</span></font><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>1. Should you let the VTL =
make
copies to tape or insist that a media server write to tape. =
<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'>If you are facing an exposure issue =
with
getting your backup media offsite via duplication / vaulting, then you =
may want
to look at letting the VTL create your media. I say this with one very =
BIG
caveat.<span style=3D'mso-spacerun:yes'> </span>You want to ensure =
that you
#1 have enough bandwidth on the back end of your Virtual Tape Library to =
ensure
you can create tapes in accordance with your window for physical tape
creation.<span style=3D'mso-spacerun:yes'> </span>#2 you want to =
make sure
that the barcodes in your physical library are synchronized to your =
virtual
cartridges on the <span class=3DSpellE>VTL’s</span> disk.<span
style=3D'mso-spacerun:yes'> </span>Automation of the barcode
synchronization is <span class=3DGramE>best,</span> manual is okay but =
requires a
higher degree of touch and management.<span =
style=3D'mso-spacerun:yes'>
</span>#<span class=3DGramE>3<span style=3D'mso-spacerun:yes'> =
</span>If</span>
you allow the VTL to create your physical tape you also want to ensure =
that you
are allowed to use the physical tape as a COPY for DR, in other words =
allow you
to separate the physical from the virtual. <span
style=3D'mso-spacerun:yes'> </span>So now you have an online copy =
still
(virtual) and a DR copy offsite (separated =
physical).<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>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>2. When you selected your =
VTL, how
did you compare them? How did you size the VTL you =
chose?<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'>We have a tool our field uses to =
help size
the VTL, however, I would suggest that you look at how much data you =
plan on
backing up, how many copies you need online for high speed recovery and =
how
many media are required (physical) so you can adequately size your =
“backend”
library. <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>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>3. Why do some docs say =
sometimes
restoring from tape can be faster than restoring from the <span =
class=3DGramE>VTL.</span><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'>I’ve not heard this one.<span
style=3D'mso-spacerun:yes'> </span>I would love to read some of =
those
writings.<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>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>4. How are you maximizing
performance with VTL? What strategies are you using for large amounts of =
<span
class=3DGramE>data.</span><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'>I’ve done all of the =
performance
testing for our offering (<span class=3DSpellE>Pathlight</span> VX) and =
ran
through performance testing the same way I would have done with =
conventional
tape (<span class=3DSpellE>bptm</span> and <span =
class=3DSpellE>bpbkar</span>
logging).<span style=3D'mso-spacerun:yes'> </span>I ended up with =
256K
block size (UNIX) and approximately 64 data =
buffers.<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>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><span =
class=3DGramE><font size=3D2
face=3DArial><span style=3D'font-size:10.0pt;font-family:Arial'>5. =
Does</span></font></span><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> multiple
streams still make sense?<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'>Multiple streams make sense, but
multiplexing doesn’t necessarily, based on your LAN / SAN =
infrastructure.<span
style=3D'mso-spacerun:yes'> </span>The nice thing about <span =
class=3DSpellE>VTLs</span>
is you are able to send data to individual tape drives as fast or as =
slow as
your servers can afford.<span style=3D'mso-spacerun:yes'> =
</span>However
the other side of the coin is you may not have licenses for ALL of the =
tape
drives necessary to avoid multiplexing.<span =
style=3D'mso-spacerun:yes'>
</span>So at that point it may be for your environment, MPX is right, =
but
perhaps you can reduce the number of MPX streams. <span
style=3D'mso-spacerun:yes'> </span>This would really be a tuning =
<span
class=3DSpellE>disucsion</span>.<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>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>6. What tools are you =
managing your
VTL with? <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'>We have a browser based =
interface.<o:p></o:p></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'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'> </span></font><o:p></o=
:p></p>
</div>
</div>
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