Ah I see the way we are all confusing each other.
A) If you use the NetApp as a NAS device, and back it up using NDMP, you
can restore individual files to the NetApp.
B) If you use the NetApp with the FCP interface as SAN disk, you can only
restore the complete LUN using NDMP.
For case (A) backup using NDMP is the sensible way to do it.
For case (B) there are better ways to back it up - either the standard NBU
client on each client, or "backup avoidance" like snapshot/snapmirror to a
remote NetApp, e.g. the R200.
Some applications might be OK with NDMP in case (B), for example if the
whole LUN was just one database. Not good for small user files. Anything
that you would be happy to restore the whole LUN, it may be fine. I think
you will find white papers on the NetApp web site on data protection
strategies for both NAS and FCP modes of operation.
William D L Brown
"Kennedy, Jeffrey" <jkennedy AT qualcomm DOT com>
Sent by: veritas-bu-admin AT mailman.eng.auburn DOT edu
11-Feb-2005 03:09
To
"Mark Hickey" <Mark.Hickey AT hds DOT com>, veritas-bu AT mailman.eng.auburn
DOT edu
cc
Subject
RE: [Veritas-bu] RE: Netbackup NDMP vs. regular NBK client ( Kennedy,
Jeffrey)
DAR is Direct Access Restore, to do exactly what you said; address the
tape block with the data you need directly rather than reading the
entire image.
However, this will do squat in helping with a file restore from a LUN.
The LUN in WAFL is a single file, the entire LUN, and everything in it.
There are no other files to restore from a LUN, the LUN is the file.
The only thing that recognizes the files inside the LUN is the client
and/or application that put them there. And client based backups of
that LUN are the only way to get those files to tape individually, and
hence restore them individually.
Maybe individual file restore is not a concern, maybe it is. But this
is the main problem I see with this scenario.
~JK
-----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 Mark
Hickey
Sent: Thursday, February 10, 2005 11:25 AM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] RE: Netbackup NDMP vs. regular NBK client
(Kennedy, Jeffrey)
Chris,
If you have defined a network appliance centric storage strategy, and
this will meet your needs, then you have no issues with your design.
NetBackup 5.0 (I think)and better support the Directory Aware Restore
(DAR)
part of the NDMP specification. If you have this turned on (I believe
by
default is not enabled because it increases backup times or volumes or
something), then NetBackup gets more info about the internals of the
gigantic file that the NDMP device shoves over to it. This allows a
restore
to extract a single file with hugely better performance than the old
"read
the entire image till I find it method".
The only think to worry about is a millions of files situation on the
filer.
While some of these can be addressed with ONTAP upgrades, the options
for
dealing with these situations on a filer a far fewer than if the files
are
hosted by a system with a "real" operating system.
Mark
--__--__--
Message: 1
Subject: RE: [Veritas-bu] Netbackup NDMP vs. regular NBK client
Date: Wed, 9 Feb 2005 15:21:52 -0800
From: "Kennedy, Jeffrey" <jkennedy AT qualcomm DOT com>
To: <Chris.Romano AT lazard DOT com>, <veritas-bu AT mailman.eng.auburn DOT edu>
I *believe* the problem with this picture is that there are no single
file restores from the client point of view. NDMP is just using BSD
dump/restore on the filer, which works at the file level. In the case
of filers as SAN disk the LUN is a single file from WAFL's point of
view. Which means you can only restore the entire LUN in the case of
disaster.
To get true single file restore the backups would need to be done from
the client.
As I said, I believe this to be true. But they make advances all the
time and I stopped looking at filers as SAN a while back.
~JK
-----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
Chris.Romano AT lazard DOT com
Sent: Wednesday, February 09, 2005 2:02 PM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] Netbackup NDMP vs. regular NBK client
Can anyone tell me what's wrong with this picture (aside from the
obvious one of
not being able to back up local disks):
Most of our netbackup clients will be connected to a new SAN which will
have a
Netapps files as a front-end. We are thinking of getting rid of our
Netbackup
client licenses and replacing them all with one NDMP license. We will
then
backup 99% of our data with NDMP.
Thanks,
Chris
_______________________________________________
Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn DOT edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
_______________________________________________
Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn DOT edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
_______________________________________________
Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn DOT edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
|
