Block size in NBU

Yes ...

http://www.symantec.com/docs/TECH1724

All the info you need is in here.

Hi mph999,

I need to chnage the setting on Windows 2008 platform. IS there any way do do that for netbackup ruuning on windows 2008 as master server.

--Thanks,

Neha

Exactly the same as that technote, however instead of /usr/openv/netbackup you would put these in the directory %install_path\veritas\netbackup  (where %install_path is where you installed NetBackup)

here is the TN for windows

http://www.symantec.com/docs/TECH18422

Make sure you test the backups to see what settings suits you, you might need to play a bit.

The settings go on the media servers ...

You forgot to tell us NBU version?
There are different defaults and options in the different NBU versions.

We don't change block size in NBU - we change the buffer size to match tape or disk block size.

Defaults and recommendations can be found in the relevant Performance Tuning doc:

Symantec NetBackup™ 7.0 - 7.1 Backup Planning and Performance Tuning Guide: 
http://www.symantec.com/docs/DOC4483

Updated NetBackup Backup Planning and Performance Tuning Guide for Release 7.5 and Release 7.6

Hi Marianne,

NBU version is 7.6.

Master server is windows 2008 platform. My master server is acting as media server as well,

there is no size_data_buffer available inm the following path:

<INSTALL_PATH>\NetBackup\db\config

Do i need to create a file? If yes, how do i do it and set the required block size?

In one of the links on symantec forums, its mentioned that i need to create a file on the above location, add the desired values in the multiples of 1024 and need to ensure there is no extension after saving the file. I am bit confused as i am very new to NBU.

I also tried one more thing that is, in host properties>> clients>> Client properties>>windows client >> client settings>>communication buffer size.

the default value is 128 kb. 

i changed it to 64kb. i took a backup to tape library and the throughput and time taken for both the cases (64k and 128k) was the same. Is this a ormal behaviour with NBU?

is this the write procedure to change the block size?? 

Need a resolution at the earliest :(

I would be really great if you can guide me through this. 

Thanks in advance!!

The question is, why do you want to do this?

To measure throughput performance numbers.

<INSTALL_PATH>\NetBackup\db\config

Do i need to create a file? If yes, how do i do it and set the required block size?

In one of the links on symantec forums, its mentioned that i need to create a file on the above location, add the desired values in the multiples of 1024 and need to ensure there is no extension after saving the file. I am bit confused as i am very new to NBU.

Yes, in the dir you create files like this:

SIZE_DATA_BUFFERS (262144)

NUMBER_DATA_BUFFERS (128)

The numbers in () are suggested starting values, so SIZE_DATA_BUFFERS would contain only 262144 and NUMBER_DATA_BUFFERS would contain only 128.

262144 is divisable by 1024, 262144/1024 = 256, so this would be a block size og 256k

Be careful on windows, that when you create the files, they are called only <filename> NOT <filename>.txt   (eg, we do not want ant file extension /suffix)

Windows has a habit of adding suffix only files, and somethimes this is hidden so cannot easily be seen.

No restarts are required for this, the vaules are picked up when a new backup starts.

I do not recommend playing around with the net buffer size, at least not yet until the size/ number data buffers are sorted out, too many changes makes things confusing, and just because they are settings that can be changed, does not mean they should be changed.