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Need to backup 8 TB data, lots of small files

Created: 23 Apr 2013 | 5 comments
jadlip's picture


I have Netbackup 7.5 (win2k8r2) need to backup method for win2k3 server having 8 TB of data with lots of small files.

I have a all lic as using capacity base lic model.

I tried with flash copy but polciy validation come with error -

"Snapshot could not be created with VSS method"

This 8 TB disk is Windows dynamic disk.

Please suggest


Pradeep Jadli

Operating Systems:

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Stavros41's picture


Make sure you are not using the directive All Local Drives as this is not supported with flashbackup and will cause policy validation to fail

Marianne's picture

Since Client is on W2003 - have you confirmed that the latest VSS hotfixes are installed?

It is possible that there is not sufficient space on any other local disk to create VSS snapshot. 
Have a look at this TN - it explains how snapshot creation can be tested manually:

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

Mark_Solutions's picture

Two things here .. drives to be backed up must be listed as \\.\D: and not as D:\

Second ... if you have any managed disk at the back end (like hitachi san etc) the VSS could call on that to do the snapshot - which will probably be denied - so in the snapshot options choose to use VSS but use the system option rather than auto to force it to ask Windows to do the snapshot and not any storage behind it

Hope this helps

Authorised Symantec Consultant . Expert Partner.

Don't forget to "Mark as Solution" if someones advice has solved your issue - and please bring back the Thumbs Up!!.

Gautier Leblanc's picture

Flashbackup is not the unique answer... What is your target storage ? Tapes ? Deduplicated Disk ? 

If you have dedup target, it could be interesting to do files backup with NTFS change journal, and do incremental backups forever with optimized synthetic backup or accelerator .

Do not forget to deactive antivirus software for Netbackup process in this case.

Enrique Pereira Calvo's picture

Yes, as Gautier says, if you can use accelerator it would be the greatest think that you can do.

I did a test some time ago with a very slow machine, 1TB 500.000 files. Normal full backup 50horas. After using accelerator and journaling, the next full backup took only 10 minutes.

Another recent one with another slow machine: 80GB and 1.2 million files. First full 9 hours, rest of them 9 minutes (accelerator and journalling).