Hi Klaus,

if you can get a hold of the former 'Performance Tuning Guide', you will find what you need.

Do not forget that your tape drive type must be able to support that. To verify that, set the NSR_DEV_BLOCK_SIZE environment variable.

Here you go

Mark Bellows

That's pretty large bs.  What tape media do you use?

Hi ,

You can set the block size for the tape drive by below mentioned steps.

1 Right click on the drive (Ex- \\Tape1) then click on properties (In Diagnostic mode)

2 Click on advanced tab

3 You can change the device block size in "device block size tab".

Thanks

Hello,

thanks for the tipps, but I know have to change the block size in networker.

The solution for my problem is, that Windows2008r2 only supports an block size from max. 512kb.

Thanks a lot.

Regards

Klaus

Hi Klaus; it seems unlikely that Windows 2008 would have an OS limit of 512 KB on a tape device, but on the other hand, they deliberately removed Tape support for Windows Server Backup and had that native tape.sys limitation of 64 KB in 2003.

That said - are you certain of this limitation for 2008? And certain, if it exists, that it can currently be changed?

I'll look into it but typically we are at the highest level and therefore subject to every other layer which may be a limiting factor:

Tape device

Transport hardware

OS

Tape / transport drivers

Application

(in that order)

Meanwhile - you can run cdi_block_limits -f (tape drive) to see what CDI detects as the limit for the drive.

Cheers, James.