Joe,
After restoring the LUN file on the DR filer, you will need to manually create
the igroup and map the restored LUN file to that igroup.
It sounds like what you are referring to the "setup" of the LUN is actually the
mapping of that LUN to an igroup.
This mapping information is not backed up with an NDMP backup of a volume
containing LUN(s).
The igroup mapping is saved in every weekend autosupport that your filer sends
to NetApp, however.
You could recreate the igroups on the DR filer based on that data if you
haven't pre-populated them.
But I would recommend pre-populating the igroups on the DR filer - it
definitely saves time in the event of a DR situation - and NetApp's autosupport
site could always be down.
You would have the DR igroups created ahead of time but no LUNs mapped those
igroups.
I'm confused by your comment about NDMP licensing - NetApp does not have a
license for NDMP usage.
All filers can use direct NDMP (fibre channel attached drives, or more recently
SAS attached drives), remote NDMP to an NetBackup media server's storage unit
or 3-way NDMP to another NetApp filer.
At the start of each NDMP backup, the NetApp creates a snapshot automatically
just for the use of that NDMP job.
It's still a good idea to create one manually, however, just in case the NDMP
backup job fails - the snapshot is still there to retry.
The problem with a database on top of a virtualized server on top of a LUN is
that there are multiple levels of caching that need to be sync'd (database, VM
filesystem, host filesystem) before you can truly backup the underlying LUN.
-daniel
-----Original Message-----
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of joe1871
Sent: Wednesday, September 12, 2012 5:48 PM
To: VERITAS-BU AT MAILMAN.ENG.AUBURN DOT EDU
Subject: [Veritas-bu] Backing up LUNS via NDMP to a NetApp Filer using
Snapshots Q
Hi ,
I am tasked with backing up an Oracle DB that runs in VM's (Oracle Xen). It is
my understanding based on what the vendor told me that if I back up the Oracle
DB using NDMP I will get not only the LUNS, but the LUN setup. Meaning if I
restore to a blank filer I can expect the LUNS to be recreated on that filer,
and Oracle should connect with some minor IP reconfiguration.
To prove this concept I took our test environment filer, a FAS2020, and a
second blank FAS2020. I stop the DB - shut down all the pertinent VM's, take a
set of manual snapshots of all vols, and then restart all the VM's. I then
back up the snapshots via remote NDMP - the FAS2020s are not NDMP licensed.
The next step is obviously to restore the snapshots to the blank filer as a
proof of concept. The LUN gets restored, but I get no LUN setup - I have to
manually recreate them.
Am I correct in the first statement - that the LUNS will get rebuilt? If I
take manual snapshots to back up the Oracle production database will I still
get the LUN setup? Am I way off base here?
As far as I can see my only choice is to take manual snaps on the prod filer.
I can't back up the Prod DB while its running, and I can't afford the time it
takes to back up the entire environment with NDMP while it is down. So I shut
it down, take a snap, start it again, and then back up the snap. Is that
valid? I don't have a large enough test restore filer to test this with the
prod environment.
Thanks in advance.
Joe
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