NDMP cumulative incremental backups of Netapp

[GV89]

We are backing up large number of NetApp snapshot (SnapVault) through NDMP, for NetApp Filer FAS2040.

Backup selection is : /Vol/volname/.snapshot/daily.o (this is static and same for Full and Cumulative backup in a policy)

We have monitored the backup trends and found that there is very slight difference in Data size for Full & Cumulative Incremental backups

Backup Selection	FULL 26/10/13	CUM 28/10/13
/vol/abcd_esx01/.snapshot/daily.0	775 GB	709 GB
/vol/abcd_esx/.snapshot/daily.0	868 GB	866 GB

Could someone plese tell me, Why cummulative backup is not taking change from last full...?
 

[Marianne]

You forgot to mention your NBU version?

See this Bug Report: http://www.symantec.com/docs/TECH148304

[GV89]

Hi Granny,

its Netbackup 7.5.0.5

[Marianne]

Please check the logs as per the TN in my previous post.

[Yasuhisa_Ishika]

Please try to switch backup selections to primary area of each volume. Latest daily snapshot is recognized as being completely different than that of other day, I suppose.

FYI: Only work NetBackup take part in NDMP incremental handling is specifying dump level. Based on dump level, NDMP host actual determine which files to be backed up in incremental backups.

[GV89]

Ishikawa,

Is there any TN regarding how NDMP host determine which files to be backup up in incremental,

How this is done....??

[GV89]

Granny,

I could not find the TN, Could you please provide me the link...?

[Marianne · Accepted solution]

See this TN:

http://www.symantec.com/docs/TECH143455

NDMP backups - What triggers an Incremental versus a Full backup ?

and:

http://www.symantec.com/docs/HOWTO85918

NDMP backup levels

[GV89]

Thanks.....