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[Veritas-bu] Disk Based Backup
2004-06-09 12:24:24
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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,
Paul Esson
Senior Support Engineer
Redstor Limited
Direct: +44 (0) 1224 595381
Mobile: +44 (0) 7766 906514
E-Mail: paul.esson AT redstor DOT com
Web: www.redstor.com
REDSTOR LIMITED
Torridon House
73-75 Regent Quay
Aberdeen
UK
AB11 5AR
Disclaimer:
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
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and may be unlawful. Disclosure to any party other than the addressee,
whether inadvertent or otherwise is not intended to waive privilege or
confidentiality.
=20
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<DIV><SPAN class=3D191183815-09062004><FONT face=3DVerdana=20
size=3D2>Folks,</FONT></SPAN></DIV>
<DIV><SPAN class=3D191183815-09062004><FONT face=3DVerdana=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D191183815-09062004><FONT face=3DVerdana size=3D2>I am =
currently=20
deliberating over disk based backup options and would welcome comments =
from=20
those with first hand experience. </FONT></SPAN></DIV>
<DIV><SPAN class=3D191183815-09062004><FONT face=3DVerdana=20
size=3D2></FONT></SPAN><SPAN class=3D191183815-09062004><FONT =
face=3DVerdana=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D191183815-09062004><FONT face=3DVerdana =
size=3D2>Specifically, I am=20
trying to way up the pros and cons of using a Virtual Tape Library =
versus=20
sharing storage out to media servers from say a </FONT></SPAN><SPAN=20
class=3D191183815-09062004><FONT face=3DVerdana size=3D2>SATA disk =
array. The=20
latter looks attractive particularly since the introduction in v5.0 of =
Disk=20
Staging Storage Units (DSSUs). Is anyone using </FONT></SPAN><SPAN =
class=3D191183815-09062004><FONT face=3DVerdana size=3D2>DSSUs =
currently? With=20
VTL there seems to be the cost issue of licensing drives as in a regular =
library.</FONT></SPAN></DIV>
<DIV><SPAN class=3D191183815-09062004><FONT face=3DVerdana=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D191183815-09062004><FONT face=3DVerdana size=3D2>What =
I would like=20
to do is write all backups initially to disk but then stage the full =
backups to=20
tape. I had hoped to create two tape copies one to remain onsite=20
(in a tape library) and the other to go offsite. =
However, I am=20
somewhat confused as to the NetBackup functionality required to achieve=20
this? If I use the DSSU the data appears to be migrated to tape as =
part of=20
the policy anyway, but how would I achieve my twin copies on tape,=20
ideally with different retention levels? Do I actually =
require to use=20
inline copy or even Vault (duplication) to achieve my end? The =
concern I=20
have with inline copy is that the quicker write to disk will be negated =
by=20
having to write to tape at the same time and before the job =
completes. As=20
for Vault I don't know the product at all but believe it is =
licensed by=20
drive (How does this work if your source is a disk storage unit?) and =
that could=20
prove costly. I have also read on this list adverse comments about =
duplication speeds, although I would be writing from disk to=20
tape.</FONT></SPAN></DIV>
<DIV><FONT face=3DVerdana size=3D2></FONT> </DIV>
<DIV><FONT face=3DVerdana size=3D2><SPAN class=3D191183815-09062004>All =
comments on=20
any of these items very welcome.</SPAN></FONT></DIV>
<DIV><FONT face=3DVerdana size=3D2></FONT> </DIV>
<DIV><SPAN class=3D191183815-09062004><FONT face=3DVerdana=20
size=3D2>Regards,</FONT></SPAN></DIV>
<DIV class=3DSection1>
<P class=3Dsection1 style=3D"MARGIN-BOTTOM: 12pt"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Verdana">Paul Esson<BR>Senior =
Support=20
Engineer<BR>Redstor Limited<BR><BR>Direct:=20
+44 (0) 1224 =
595381<BR>Mobile:=20
+44 (0) 7766 =
906514<BR>E-Mail:=20
=20
paul.esson AT redstor DOT
com<BR>Web: &=
nbsp; =20
www.redstor.com<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=20
addressee. If you are not the intended addressee, any disclosure, =
copying=20
or distribution by you is prohibited and may be unlawful. =
Disclosure to=20
any party other than the addressee, whether inadvertent or otherwise is =
not=20
intended to waive privilege or confidentiality.<?xml:namespace prefix =
=3D o ns =3D=20
"urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></P></DIV>
<DIV> </DIV></BODY></HTML>
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