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NBU doesn't know that you are using a VTL, all it sees are tape drives
and a library. So for each drive you create, a tape drive license would
be required.
=20
ADIC Pathlight VX is the same, drive license required for each virtual
drive created.
=20
David A. Chapa * Technical Advisor * ADIC * 720.249.5836 * 720.272.8452
cell * david.chapa AT adic DOT com <mailto:david.chapa AT adic DOT com>=20
HIGH PERFORMANCE, SCALABLE, RELIABLE - http://www.adic.com/gopathlightvx
<http://www.adic.com/gopathlightvx>=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 Hampus
Lind
Sent: Saturday, June 12, 2004 3:30 AM
To: McDonald_Brian AT emc DOT com; Veritas maillista
Subject: Re: [Veritas-bu] Disk Based Backup
=20
Hi again!
=20
I forgot to ask about veritas licensing... We are considering to but a
DL300, but our veritas sales rep. say that veritas hasent licensed this
product yet, hopefuly they will do this during june, he say.
However he also said that we probably we have to buy 1 tape drive
license for every virtual drive we create. This is kind a bad i think
because you lose some of the flexibility with the DL. Also it can be
quite expencive if we create many drives. I still consider the DL to be
something we need, and it is much sheaper than real drives.
Also, how will veritas control how many drives one have? Maybe the
license the entire DL cabinett and it will cost us much money.
=20
Who have you licensed your DL? Who do you think veritas will do this
licensing?
=20
Best Regards
Hampus Lind
=20
----- Original Message -----=20
From: McDonald_Brian AT emc DOT com=20
To: Ebon_Nash AT compuware DOT com ; joe AT joe DOT net ;
paul.esson AT redstor DOT com ; veritas-bu AT mailman.eng.auburn DOT edu=20
Sent: Wednesday, June 09, 2004 9:34 PM
Subject: RE: [Veritas-bu] Disk Based Backup
=20
The newer disk libraries based on SATA are very fast. The only
tape devices I have tested that even came close to them in performance
using Netbackup
is the IBM FC LTO Gen 2. Then, with multistreams or with a
multistream/mulitplexed backup the difference again widens edge: the
disk library solution.
=20
I compared the EMC DL against various TLUs with SCSI DLT
7000, SDLT 220N, SDLT320, LTO gen 1, LTO gen 2 and FC LTO gen 1 and gen
2.=20
Pushed to its maximum aggregate performance the DL will do 450
MB/s. If there is any single tape library that can do that, I would have
to see it.
Thats not specmanship, its actual measured performance.=20
The new DLs in many cases save you money too by
- eliminating the SSO Option in some cases and still be able to
share this device with multiple hosts
- Can also replicate the virtual tapes to physical tapes if
you're obligated to do that. The end result is you need half the
physical tapes you used to
need.
- If you are trucking off line copies to a secured site, you can
eliminate the truck middleman by putting the physical tape device there
and configuring it the=20
DL over a DWDM link. Simply by telling NBU to eject (in this
case virtual) tape from the virtual library will automatically start the
copy to physical tape at=20
the secured site. . I did this over a 200km DWDM link to a STK
L180 with FC 994B tape drives. Its tough to get double digit IO
performance
of anything over a single DWDM link and I was doing 17 MB/s with
one stream.=20
=20
But the real beauty of the DL is the benefit of RAID. That
increases the reliability of the on site backup set. When a tape drive
fails, you lose a storage device
and some aggregate performance of the TLU until the drive is
replaced. If a disk in the DL fails, no loss of performance or storage
unit.
A tape device can run into a "bad tape experience" now and
then doing a backup. You won't have that with a DL. Of course you could
have that with
the physical TLU device the DL might optionally have as the
archiving device, but thats not going to interfere with your backup
window. The DL to physical tape
copy process is "out of band" in respects to the Netbackup
backup servers.=20
=20
=20
=20
=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 Nash, Ebon
Sent: Wednesday, June 09, 2004 1:26 PM
To: 'Johnny Oestergaard'; Paul Esson;
veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] Disk Based Backup
We moved from disk storage units to disk staging storage
units and took a huge performance hit. The overhead required for disk
staging, and apparent filesystem fragmentation due to 100% utilized
filesystems, forced us to revert back to disk storage units. If
performance is an issue, be wary of disk staging storage units.
=20
=20
Ebon Nash
Compuware Corp.
-----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 Johnny
Oestergaard
Sent: Wednesday, June 09, 2004 12:41 PM
To: Paul Esson;
veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Disk Based Backup
Regarding speed on disk compared to tape I would
say that high-speed tapedrives are much faster then disk except for the
time it takes to load and unload the tape. When the tape is at the right
position tapes are fast. Our 9940B should be able to take around 70 MB/s
if we could feen them that fast. I would like to see a SATA disk system
that could take the same load as just 4 of the 9940B drives.
In an installation using diskstaging I see one
great thing that I think we will use and that is most of all to stage
small backups and slow backups to disk and then let NBU stage them to
tape. With a little luck we should be able to bring our multiplexing
down and thereby speed tapeduplication up.
=09
What makes tapeduplication slow is most of all
on duplexed tapes. We run some tests on duplication speed on backups
that where not duplexed some years ago, and as I remember it we did this
at almost the max speed of the drives (We did 3 tests on 9940A drives)
=09
I would use vault to make my off-site copies
=09
/johnny
=09
At 17:24 09-06-2004 +0100, Paul Esson wrote:
=09
=09
Folks,
=20
I am currently deliberating over disk based
backup options and would welcome comments from those with first hand
experience. =20
=20
Specifically, I am trying to way up the pros and
cons of using a Virtual Tape Library versus sharing storage out to media
servers from say a SATA disk array. The latter looks attractive
particularly since the introduction in v5.0 of Disk Staging Storage
Units (DSSUs). Is anyone using DSSUs currently? With VTL there seems
to be the cost issue of licensing drives as in a regular library.
=20
What I would like to do is write all backups
initially to disk but then stage the full backups to tape. I had hoped
to create two tape copies one to remain onsite (in a tape library) and
the other to go offsite. However, I am somewhat confused as to the
NetBackup functionality required to achieve this? If I use the DSSU the
data appears to be migrated to tape as part of the policy anyway, but
how would I achieve my twin copies on tape, ideally with different
retention levels? Do I actually require to use inline copy or even
Vault (duplication) to achieve my end? The concern I have with inline
copy is that the quicker write to disk will be negated by having to
write to tape at the same time and before the job completes. As for
Vault I don't know the product at all but believe it is licensed by
drive (How does this work if your source is a disk storage unit?) and
that could prove costly. I have also read on this list adverse comments
about duplication speeds, although I would be writing from disk to tape.
=20
All comments on any of these items very welcome.
=20
Regards,
=09
Paul Esson
Senior Support Engineer
Redstor Limited
=09
Direct: +44 (0) 1224 595381
Mobile: +44 (0) 7766 906514
E-Mail: paul.esson AT redstor DOT com
Web: www.redstor.com
<http://www.redstor.com/>=20
=09
REDSTOR LIMITED
Torridon House
73-75 Regent Quay
Aberdeen
UK
AB11 5AR
=09
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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'>NBU doesn’t know that you are =
using
a <span class=3DGramE>VTL,</span> all it sees are tape drives and a =
library.<span
style=3D'mso-spacerun:yes'> </span>So for each drive you create, a =
tape drive
license would be required.<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'>ADIC <span =
class=3DSpellE>Pathlight</span>
VX is the same, drive license required for each virtual drive =
created.<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><b><font size=3D1 color=3Dnavy face=3D"Times New Roman"><span =
style=3D'font-size:
7.5pt;color:navy;font-weight:bold;mso-no-proof:yes'>David A. Chapa =
</span></font></b><font
size=3D1 color=3Dnavy face=3DSymbol><span =
style=3D'font-size:7.5pt;font-family:Symbol;
color:navy;mso-no-proof:yes'>½</span></font><font size=3D1 =
color=3Dnavy><span
style=3D'font-size:7.5pt;color:navy;mso-no-proof:yes'> Technical Advisor =
</span></font><font
size=3D1 color=3Dnavy face=3DSymbol><span =
style=3D'font-size:7.5pt;font-family:Symbol;
color:navy;mso-no-proof:yes'>½</span></font><font size=3D1 =
color=3D"#999999"><span
style=3D'font-size:7.5pt;color:#999999;mso-no-proof:yes'> =
</span></font><b><font
size=3D1 color=3Dred><span =
style=3D'font-size:7.5pt;color:red;font-weight:bold;
mso-no-proof:yes'>ADIC</span></font></b><font size=3D1 =
color=3D"#999999"><span
style=3D'font-size:7.5pt;color:#999999;mso-no-proof:yes'> =
</span></font><font
size=3D1 color=3Dnavy face=3DSymbol><span =
style=3D'font-size:7.5pt;font-family:Symbol;
color:navy;mso-no-proof:yes'>½</span></font><font size=3D1 =
color=3Dnavy><span
style=3D'font-size:7.5pt;color:navy;mso-no-proof:yes'> 720.249.5836 =
</span></font><font
size=3D1 color=3Dnavy face=3DSymbol><span =
style=3D'font-size:7.5pt;font-family:Symbol;
color:navy;mso-no-proof:yes'>½ 720.272.8452 =
</span></font><em><i><font size=3D1
color=3Dnavy face=3D"Times New Roman"><span =
style=3D'font-size:7.5pt;color:navy;
mso-no-proof:yes'>cell</span></font></i></em><font size=3D1 =
color=3Dnavy><span
style=3D'font-size:7.5pt;color:navy;mso-no-proof:yes'> =
</span></font><font
size=3D1 color=3Dnavy face=3DSymbol><span =
style=3D'font-size:7.5pt;font-family:Symbol;
color:navy;mso-no-proof:yes'>½ </span></font><em><i><font =
size=3D1 color=3Dnavy
face=3D"Times New Roman"><span =
style=3D'font-size:7.5pt;color:navy;mso-no-proof:
yes'> </span></font></i></em><font color=3Dnavy><span =
style=3D'color:navy;
mso-no-proof:yes'><a href=3D"mailto:david.chapa AT adic DOT com"><font =
size=3D1><span
style=3D'font-size:7.5pt'>david.chapa AT adic DOT
com</span></font></a><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'>HIGH PERFORMANCE, SCALABLE, RELIABLE =
- </span></font><font
color=3Dnavy><span style=3D'color:navy;mso-no-proof:yes'><a
href=3D"http://www.adic.com/gopathlightvx";><font size=3D1><span =
style=3D'font-size:
7.5pt'>http://www.adic.com/gopathlightvx</span></font></a></span></font><=
o:p></o:p></p>
</div>
<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>Hampus Lind<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Saturday, June 12, =
2004 3:30
AM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> =
McDonald_Brian AT emc DOT com;
Veritas maillista<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> Re: [Veritas-bu] =
Disk
Based Backup</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>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>Hi =
again!</span></font><o:p></o:p></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'>I forgot to ask about =
veritas
licensing... We are considering to but a DL300, but our veritas sales =
rep. say
that veritas hasent licensed this product yet, hopefuly they will do =
this during
june, he say.</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'>However he also said that =
we
probably we have to buy 1 tape drive license for every virtual drive we =
create.
This is kind a bad i think because you lose some of the flexibility with =
the
DL. Also it can be quite expencive if we create many drives. I still =
consider
the DL to be something we need, and it is much sheaper than real =
drives.</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'>Also, how will veritas =
control how
many drives one have? Maybe the license the entire DL cabinett and it =
will cost
us much money.</span></font><o:p></o:p></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'>Who have you licensed your =
DL? Who
do you think veritas will do this =
licensing?</span></font><o:p></o:p></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'>Best =
Regards</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'>Hampus =
Lind</span></font><o:p></o:p></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>
<blockquote style=3D'border:none;border-left:solid black =
1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'=
>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>----- Original Message =
----- <o:p></o:p></span></font></p>
</div>
<div style=3D'font-color:black'>
<p class=3DMsoNormal =
style=3D'margin-left:.5in;background:#E4E4E4'><b><font size=3D2
face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial;font-weight:bold'>From:</span=
></font></b><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> <a
href=3D"mailto:McDonald_Brian AT emc DOT com" =
title=3D"McDonald_Brian AT emc DOT com">McDonald_Brian AT emc DOT com</a>
<o:p></o:p></span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><b><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;font-weight:bold'>To:</span><=
/font></b><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> <a
href=3D"mailto:Ebon_Nash AT compuware DOT com" =
title=3D"Ebon_Nash AT compuware DOT com">Ebon_Nash AT compuware DOT com</a>
; <a href=3D"mailto:joe AT joe DOT net" title=3D"joe AT joe DOT net">joe AT joe
DOT net</a> ; =
<a
href=3D"mailto:paul.esson AT redstor DOT com" =
title=3D"paul.esson AT redstor DOT com">paul.esson AT redstor DOT com</a>
; <a href=3D"mailto:veritas-bu AT mailman.eng.auburn DOT edu"
title=3D"veritas-bu AT mailman.eng.auburn DOT edu">veritas-bu AT mailman DOT
eng.auburn=
.edu</a>
<o:p></o:p></span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><b><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;font-weight:bold'>Sent:</span=
></font></b><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> Wednesday,
June 09, 2004 9:34 PM<o:p></o:p></span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><b><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;font-weight:bold'>Subject:</s=
pan></font></b><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> RE:
[Veritas-bu] Disk Based Backup<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 =
color=3Dblue face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;color:blue'> The newer =
disk
libraries based on SATA are very fast. The only tape devices =
I have
tested that even came close to them in performance using =
Netbackup</span></font><o:p></o:p></p>
</div>
<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'>is the IBM FC =
LTO Gen 2.
Then, with multistreams or with a multistream/mulitplexed backup the =
difference
again widens edge: the disk library =
solution.</span></font><o:p></o:p></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 =
color=3Dblue face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;color:blue'> I =
compared
the EMC DL against various TLUs with SCSI DLT 7000, SDLT =
220N,
SDLT320, LTO gen 1, LTO gen 2 and FC LTO gen 1 and gen =
2. </span></font><o:p></o:p></p>
</div>
<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'>Pushed to
its maximum aggregate performance the DL will do 450 =
MB/s. If
there is any single tape library that can do that, I would have to see =
it.</span></font><o:p></o:p></p>
</div>
<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'>Thats not =
specmanship,
its actual measured performance. </span></font><o:p></o:p></p>
</div>
<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'> The =
new DLs
in many cases save you money too by</span></font><o:p></o:p></p>
</div>
<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'> - elim=
inating
the SSO Option in some cases and still be able to share this device with
multiple hosts</span></font><o:p></o:p></p>
</div>
<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'>- Can also =
replicate
the virtual tapes to physical tapes if you're obligated to do that. The =
end
result is you need half the physical tapes you used =
to</span></font><o:p></o:p></p>
</div>
<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'>need.</span></fon=
t><o:p></o:p></p>
</div>
<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'>- If you are =
trucking off
line copies to a secured site, you can eliminate the truck =
middleman by
putting the physical tape device there and configuring it =
the </span></font><o:p></o:p></p>
</div>
<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'>DL over a DWDM =
link.
Simply by telling NBU to eject (in this case virtual) tape from the
virtual library will automatically start the copy to physical tape =
at </span></font><o:p></o:p></p>
</div>
<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'>the =
secured site. .
I did this over a 200km DWDM link to a STK L180 with FC 994B tape =
drives. Its
tough to get double digit IO performance</span></font><o:p></o:p></p>
</div>
<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'>of anything over =
a single
DWDM link and I was doing</span></font> <font size=3D2 color=3Dblue
face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial;color:blue'>17 MB/s
with one stream. </span></font><o:p></o:p></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 =
color=3Dblue face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;color:blue'> But the =
real beauty
of the DL is the benefit of RAID. That increases the =
reliability of
the on site backup set. When a tape drive fails, you lose a storage =
device</span></font><o:p></o:p></p>
</div>
<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'>and some =
aggregate
performance of the TLU until the drive is replaced. If a disk in the DL =
fails,
no loss of performance or storage unit.</span></font><o:p></o:p></p>
</div>
<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'> A tape =
device can run
into a "bad tape experience" now and then doing a backup. You =
won't
have that with a DL. Of course you could have that =
with</span></font><o:p></o:p></p>
</div>
<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'>the physical TLU =
device
the DL might optionally have as the archiving device, but thats not =
going
to interfere with your backup window. The DL to physical =
tape</span></font><o:p></o:p></p>
</div>
<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'>copy process is =
"out
of band" in respects to the Netbackup backup servers. =
</span></font><o:p></o:p></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=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=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 =
color=3Dblue face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;color:blue'> =
</span></font><o:p></o:p></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=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'mso-margin-top-alt:0in;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>Nash, Ebon<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Wednesday, June 09, =
2004
1:26 PM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> 'Johnny Oestergaard'; =
Paul
Esson; veritas-bu AT mailman.eng.auburn DOT edu<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> RE: [Veritas-bu] =
Disk
Based Backup<o:p></o:p></span></font></p>
</div>
<blockquote =
style=3D'margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
<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'>We moved from =
disk
storage units to disk staging storage units and took a huge performance
hit. The overhead required for disk staging, and apparent =
filesystem
fragmentation due to 100% utilized filesystems, forced us to revert back =
to
disk storage units. If performance is an issue, be wary of disk =
staging
storage units.</span></font><o:p></o:p></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=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 =
color=3Dblue face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;color:blue'>Ebon =
Nash</span></font><o:p></o:p></p>
</div>
<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'>Compuware =
Corp.</span></font><o:p></o:p></p>
</div>
<blockquote =
style=3D'margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
<p class=3DMsoNormal =
style=3D'mso-margin-top-alt:0in;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>Johnny Oestergaard<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Wednesday, June 09, =
2004
12:41 PM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> Paul Esson;
veritas-bu AT mailman.eng.auburn DOT edu<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> Re: [Veritas-bu] =
Disk
Based Backup</span></font><o:p></o:p></p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'>Regarding speed on disk compared to tape I =
would say
that high-speed tapedrives are much faster then disk except for the time =
it
takes to load and unload the tape. When the tape is at the right =
position tapes
are fast. Our 9940B should be able to take around 70 MB/s if we could =
feen them
that fast. I would like to see a SATA disk system that could take the =
same load
as just 4 of the 9940B drives.<br>
In an installation using diskstaging I see one great thing that I think =
we will
use and that is most of all to stage small backups and slow backups to =
disk and
then let NBU stage them to tape. With a little luck we should be able to =
bring
our multiplexing down and thereby speed tapeduplication up.<br>
<br>
What makes tapeduplication slow is most of all on duplexed tapes. We run =
some
tests on duplication speed on backups that where not duplexed some years =
ago,
and as I remember it we did this at almost the max speed of the drives =
(We did
3 tests on 9940A drives)<br>
<br>
I would use vault to make my off-site copies<br>
<br>
/johnny<br>
<br>
At 17:24 09-06-2004 +0100, Paul Esson wrote:<br =
style=3D'mso-special-character:
line-break'>
<![if !supportLineBreakNewLine]><br =
style=3D'mso-special-character:line-break'>
<![endif]><o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DVerdana><span
style=3D'font-size:10.0pt;font-family:Verdana'>Folks,</span></font><br>
<br>
<font size=3D2 face=3DVerdana><span =
style=3D'font-size:10.0pt;font-family:Verdana'>I
am currently deliberating over disk based backup options and would =
welcome
comments from those with first hand experience. </span></font><br>
<br>
<font size=3D2 face=3DVerdana><span =
style=3D'font-size:10.0pt;font-family:Verdana'>Specifically,
I am trying to way up the pros and cons of using a Virtual Tape Library =
versus
sharing storage out to media servers from say a SATA disk array. =
The
latter looks attractive particularly since the introduction in v5.0 of =
Disk
Staging Storage Units (DSSUs). Is anyone using DSSUs =
currently?
With VTL there seems to be the cost issue of licensing drives as in a =
regular
library.</span></font><br>
<br>
<font size=3D2 face=3DVerdana><span =
style=3D'font-size:10.0pt;font-family:Verdana'>What
I would like to do is write all backups initially to disk but then stage =
the
full backups to tape. I had hoped to create two tape copies one to =
remain
onsite (in a tape library) and the other to go offsite. However, I =
am
somewhat confused as to the NetBackup functionality required to achieve
this? If I use the DSSU the data appears to be migrated to tape as =
part
of the policy anyway, but how would I achieve my twin copies on tape, =
ideally
with different retention levels? Do I actually require to use =
inline copy
or even Vault (duplication) to achieve my end? The concern I have =
with
inline copy is that the quicker write to disk will be negated by having =
to
write to tape at the same time and before the job completes. As =
for Vault
I don't know the product at all but believe it is licensed by drive (How =
does
this work if your source is a disk storage unit?) and that could prove
costly. I have also read on this list adverse comments about =
duplication
speeds, although I would be writing from disk to tape.</span></font><br>
<br>
<font size=3D2 face=3DVerdana><span =
style=3D'font-size:10.0pt;font-family:Verdana'>All
comments on any of these items very welcome.</span></font><br>
<br>
<font size=3D2 face=3DVerdana><span =
style=3D'font-size:10.0pt;font-family:Verdana'>Regards,</span></font><br>=
<br>
Paul Esson<br>
Senior Support Engineer<br>
Redstor Limited<br>
<br>
Direct: +44 (0) 1224 =
595381<br>
Mobile: +44 (0) 7766 =
906514<br>
E-Mail: =
paul.esson AT redstor DOT com<br>
Web: =
<a
href=3D"http://www.redstor.com/"; =
eudora=3Dautourl>www.redstor.com</a><br>
<br>
REDSTOR LIMITED<br>
Torridon House<br>
73-75 Regent Quay<br>
Aberdeen<br>
UK<br>
AB11 5AR<br>
<br>
Disclaimer:<br>
The information included in this e-mail is of a confidential nature and =
is
intended only for the addressee. If you are not the intended =
addressee,
any disclosure, copying or distribution by you is prohibited and may be
unlawful. Disclosure to any party other than the addressee, =
whether
inadvertent or otherwise is not intended to waive privilege or
confidentiality.<?xml:namespace prefix =3D o ns =3D
"urn:schemas-microsoft-com:office:office" /><br>
<o:p></o:p></p>
</blockquote>
<p class=3DMsoNormal =
style=3D'mso-margin-top-alt:0in;margin-right:0in;margin-bottom:
12.0pt;margin-left:.5in'><font size=3D3 face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'><br =
style=3D'mso-special-character:line-break'>
<![if !supportLineBreakNewLine]><br =
style=3D'mso-special-character:line-break'>
<![endif]><o:p></o:p></span></font></p>
<p style=3D'margin-left:.5in'><b><font size=3D2 face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;font-weight:bold'>The contents of this e-mail =
are
intended for the named addressee only. It contains information that may =
be
confidential. Unless you are the named addressee or an authorized =
designee, you
may not copy or use it, or disclose it to anyone else. If you received =
it in
error please notify us immediately and then destroy =
it.</span></font></b> <o:p></o:p></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>
</blockquote>
</blockquote>
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