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I got my information at a Veritas NB 4.5 dog-and-pony show and I asked
specifically about in-line copy and Vault. If I get two copies in the base
version and more with license then I'll be thrilled. I do this via script
now.
-M
-----Original Message-----
From: White, Steve [mailto:Steve.White AT PacifiCorp DOT com]
Sent: Tuesday, July 09, 2002 9:49 AM
To: 'Donaldson, Mark'; 'Fabbro, Andrew P'; veritas-bu AT mailman.eng.auburn DOT
edu
Subject: RE: [Veritas-bu] NB 4.5 and Inline Copies?
Are you sure about that? I thought the base product could do a maximum of
two inline copies, each restricted to the same retention whereas the Vault
option provided the ability to do more than two copies, and each one to have
a different retention.
I may be recalling this incorrectly.
Steve
-----Original Message-----
From: Donaldson, Mark [mailto:Mark.Donaldson AT experianems DOT com]
Sent: Tuesday, July 09, 2002 7:44 AM
To: 'Fabbro, Andrew P'; veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] NB 4.5 and Inline Copies?
Just a quick note that a big disappointment to me is that in-line copy is
part of the separately licensed Vault option. Unfortunately, my company is
not willing to buy the whole product to get this one feature.
-M
-----Original Message-----
From: Fabbro, Andrew P [mailto:Fabbro.Andrew AT cnf DOT com]
Sent: Monday, July 08, 2002 11:28 PM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] NB 4.5 and Inline Copies?
My understanding from NB notes I've read is that 4.5 supports in-line backup
copies. e.g., you backup a client and write the backup to two tapes at the
same time. The NB release notes say you can do up to 9 copies at the same
time.
Putting additional drives needed, etc. aside for a moment, it seems like it
could be a good way to make offsite/disaster recovery backups without the
hassle of either duplicating tapes (which doesn't scale well) or running
another full backup
for offsite/DR purposes. I assume one could use Pool A for one copy and
Pool B for another and send Pool B offsite.
Some questions:
- Has anyone used inline copying? How well does it work?
- In NB 3.4.x, to use a duplicate of a tape, you need to flip it to the
primary copy. It's easy enough to script - does NB 4.5 work the same way?
- What about shared memory usage? The calculation for NB 3.4 is number of
data buffers x size of data buffers x number of drives x MPX per drive. For
a box driving DLT (64512 data buffer size recommended, maybe 64 data
buffers), it's not a major factor - usually not over 128Mb (say, 8 drives at
4 MPX each). With more recent technologies, you want fatter buffers, more
buffers, and more MPX - easily 512Mb of shared memory, maybe more. But I
can't imagine all of that is just to drive the tape - some of it is network
buffering, right? So if I need X kilobytes of shared memory for a tape
drive, do I need X times 2 for two drives doing the same backup in an
in-line backup? Or is it more like X times 1.5 (or whatever)?
Thanks,
-drew
fabbro.andrew AT cnf DOT com <mailto:fabbro.andrew AT cnf DOT com>
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<DIV><SPAN class=237055015-09072002><FONT face=Arial color=#0000ff size=2>I got
my information at a Veritas NB 4.5 dog-and-pony show and I asked specifically
about in-line copy and Vault. If I get two copies in the base version and
more with license then I'll be thrilled. I do this via script
now.</FONT></SPAN></DIV>
<DIV><SPAN class=237055015-09072002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=237055015-09072002><FONT face=Arial color=#0000ff
size=2>-M</FONT></SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> White, Steve
[mailto:Steve.White AT PacifiCorp DOT com]<BR><B>Sent:</B> Tuesday, July 09,
2002
9:49 AM<BR><B>To:</B> 'Donaldson, Mark'; 'Fabbro, Andrew P';
veritas-bu AT mailman.eng.auburn DOT edu<BR><B>Subject:</B> RE: [Veritas-bu]
NB 4.5
and Inline Copies?<BR><BR></FONT></DIV>
<DIV><SPAN class=359154915-09072002><FONT face=Arial color=#0000ff size=2>Are
you sure about that? I thought the base product could do a maximum of
two inline copies, each restricted to the same retention whereas the Vault
option provided the ability to do more than two copies, and each one to have
a
different retention.</FONT></SPAN></DIV>
<DIV><SPAN class=359154915-09072002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=359154915-09072002><FONT face=Arial color=#0000ff size=2>I
may be recalling this incorrectly.</FONT></SPAN></DIV>
<DIV><SPAN class=359154915-09072002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=359154915-09072002><FONT face=Arial color=#0000ff
size=2>Steve</FONT></SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> Donaldson, Mark
[mailto:Mark.Donaldson AT experianems DOT com]<BR><B>Sent:</B> Tuesday,
July 09,
2002 7:44 AM<BR><B>To:</B> 'Fabbro, Andrew P';
veritas-bu AT mailman.eng.auburn DOT edu<BR><B>Subject:</B> RE:
[Veritas-bu] NB 4.5
and Inline Copies?<BR><BR></FONT></DIV>
<DIV><SPAN class=381014314-09072002><FONT face=Arial color=#0000ff
size=2>Just a quick note that a big disappointment to me is that in-line
copy is part of the separately licensed Vault option. Unfortunately,
my company is not willing to buy the whole product to get this one
feature.</FONT></SPAN></DIV>
<DIV><SPAN class=381014314-09072002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=381014314-09072002><FONT face=Arial color=#0000ff
size=2>-M</FONT></SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> Fabbro, Andrew P
[mailto:Fabbro.Andrew AT cnf DOT com]<BR><B>Sent:</B> Monday, July 08,
2002 11:28
PM<BR><B>To:</B> veritas-bu AT mailman.eng.auburn DOT
edu<BR><B>Subject:</B>
[Veritas-bu] NB 4.5 and Inline Copies?<BR><BR></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN class=569531405-09072002>My
understanding from NB notes I've read is that 4.5 supports in-line backup
copies. e.g., you backup a client and write the backup to two tapes
at the same time. The NB release notes say you can do up to 9
copies
at the same time.</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=569531405-09072002></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=569531405-09072002>Putting
additional drives needed, etc. aside for a moment, it seems like it could
be a good way to make offsite/disaster recovery backups without the
hassle
of either duplicating tapes (which doesn't scale well) or running another
full backup</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN class=569531405-09072002>for
offsite/DR
purposes. I assume one could use Pool A for one copy and Pool B for
another and send Pool B offsite.</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=569531405-09072002></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=569531405-09072002>Some
questions:</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=569531405-09072002></SPAN></FONT> </DIV><SPAN
class=569531405-09072002>
<DIV><FONT face=Arial size=2><SPAN class=569531405-09072002>- Has anyone
used inline copying? How well does it work?
</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=569531405-09072002></SPAN></FONT> </DIV>
<DIV><FONT face=Arial><FONT size=2><SPAN class=569531405-09072002>-
</SPAN>In NB 3.4.x, to use a duplicate of a tape, you need to flip it to
the primary copy. It's easy enough to script - does NB 4.5 work the
same way?</FONT></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV></SPAN><SPAN class=569531405-09072002><FONT face=Arial size=2>- What
about shared memory usage? The calculation for NB 3.4 is number of
data buffers x size of data buffers x number of drives x MPX per
drive. For a box driving DLT (64512 data buffer size recommended,
maybe 64 data buffers), it's not a major factor - usually not over 128Mb
(say, 8 drives at 4 MPX each). With more recent technologies, you
want fatter buffers, more buffers, and more MPX - easily 512Mb of shared
memory, maybe more. But I can't imagine all of that is just to
drive
the tape - some of it is network buffering, right? So if I need X
kilobytes of shared memory for a tape drive, do I need X times 2 for two
drives doing the same backup in an in-line backup? Or is it more
like X times 1.5 (or whatever)?</FONT></SPAN></DIV>
<DIV><SPAN class=569531405-09072002><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=569531405-09072002><FONT face=Arial
size=2>Thanks,</FONT></SPAN></DIV>
<DIV><SPAN class=569531405-09072002><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=569531405-09072002><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=569531405-09072002><FONT face=Arial
size=2>-drew</FONT></SPAN></DIV>
<DIV><SPAN class=569531405-09072002><FONT face=Arial size=2><FONT
color=#0000ff> </FONT><A
href="mailto:fabbro.andrew AT cnf DOT com">fabbro.andrew AT cnf DOT
com</A></FONT></SPAN></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=569531405-09072002></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=569531405-09072002>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=569531405-09072002></SPAN></FONT> </DIV></SPAN></FONT></DIV></BLOCKQUOTE></BLOCKQUOTE>
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