# Configuring OmniBack II
Block Size

- ## OmniBack II default is 64kbytes for most devices (limited to 56kbytes on NT)

- ## determines how much data at a time gets passed to the tape over the SCSI/FC bus

- ## increasing block size can increase performance (128kb, 256kb, …)

- ## changing block size requires re-initialization of tapes!

- ## block size needs to be the same for restore

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