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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><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></BODY></HTML>
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