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Backuping up raw device mapped disk attached to a VM client

Created: 06 Jun 2013 • Updated: 24 Jun 2013 | 5 comments
LucSkywalker1957's picture
This issue has been solved. See solution.

I need some knowledge: I'm using Netbackup 7.5.0.3 on Windows Server 2008 with a master and 2 media servers that are my VMWare backup hosts. I. - Backing up VM's with attached RDM disk: I've read the VMWare and snapshot client documentation but I'm still a little unclear about how to backup RDM (raw device mapped) disk. From what I read, I have 2 options: 1. - Install Netbackup client within the VM and backup the VM as I would a physical server. (not preferred.) 2. - Create an alternate backup client that has same OS and patch rev (or higher) that has access to the RDM to utilize offhost snapshot backups. My questions are: a. - Why can't I backup the RDM disk with a VMWare policy? b. - Can I backup the OS filesystem with a VMWare policy and the RDM disk with an alternate client so I can utilize offhost snapshots? c. Are there any differences if the RDM disk is physical or virtual?

Operating Systems:

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Marianne's picture

Why can't I backup the RDM disk with a VMWare policy?

Simply because VMware snapshots don't work. Open vSphere Client GUI and see if you can snapshot the VM. So, this is a VMware limitation - not NBU.

Supporting Storage Foundation and VCS on Unix and Windows as well as NetBackup on Unix and Windows
Handy NBU Links

SOLUTION
smurphy's picture

You have to run the NBU client inside the VM.

More information here:

http://www.symantec.com/docs/HOWTO70902

Steve Murphy
NetBackup Technical Support
_________________________________
http://go.symantec.com/nb

SOLUTION
vjuhola's picture

VMware does not support snapshots for RDMs http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1006392

The only solution is to treat this VM client as a physical one and install a NetBackup client there locally.

SOLUTION
LucSkywalker1957's picture

This is what I've decided to do. VSphere is only a passthru for the physical RDM. I'm going to backup the VM with a VMWare policy from the datastore and backup the attached RDM space from within the VM. The manual says to use the alternate client method to backup the RDM space, but I don't see how I can associate that space with the primary client name when it comes time to recover it if I ever had to.

smurphy's picture

There is an appendix B in the NetBackup for VMWare Guide that talks about different ways to protect the RDM disk.

One of these methods is to install NBU inside the VM and use a MS-Windows or FlashBackup-Windows policy type.  The other is to use an alternate client backup.
I have not done the latter so cannot describe to you what that looks like.  During a restore, you may have to restore the disk then manually add it back to the virtual machine.

Steve Murphy
NetBackup Technical Support
_________________________________
http://go.symantec.com/nb