How Netbackup takes flat files backup which constantly open

Posted on July 14, 2011

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Today i will discuss the problem happened with my flat files which contineously open and i had to take the backup but the backup was not being able to completed successfully. i always found it completed partially.

in my scenerio i have Veritas Netbackup 6.5 with MS windows2003.

Go to the exact location as shown in the below figure of Veritas Netbackup Server

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Select the TAB “Windows Open File Backup” and click on ADD

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After clicking on ADD you add the computer whose falt files you want to backup which(files) open constantly and then click on OK

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Now select the clients from the left pane as shown in the figure and double click on the client name which you find from the right pane

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Now you will find the below window after double clicking on client which you did in the previously step

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Now come to VSP as shown in the below figure. here you will find the default figure is 5 in the Busy Files Settings

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Now change the Busy Files Settings from 5 to 3

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After doing this my backup which was doing partially successfull end with successfully completed.

Note:- Why the backup completed successfully after changes the value of Busy File Settings from 5 to 3 ?

Busy File Wait =5 seconds
Netbackup needs at least 5 seconds of quiet time to be able to backup. So if the file is not quiet for at least 5 seconds the backup will skip it.

Busy File Wait =3 seconds
This value lowered the amout of time the file needs to be quiet for the backup to work. this means that if a file normally quiet for 4 seconds would be skipped in the first example because     Netbackup requires 5 seconds, and it would be backuped up in the second instance because NBU ONLY needs 3 seconds.

The Busy file wait property specifies how long VSP waits for a quiet period before a snapshot is created. A quiet period is a time during which no file write-activity occurs on the drive being snapped using VSP. (Default: 5 seconds.)

Please note that having a value lower than 5 seconds is not reccomended because even though the backups works, the snapshot created in 3 seconds may not be consistent since 3 seconds are not enough.

Some related links
https://www-secure.symantec.com/connect/forums/net…
https://www-secure.symantec.com/connect/forums/ms-…

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