Intel 170 Servers User Manual

Virtual tape drives are being introduced in iV5R4 so those customers  can make use of the speed of
saving to DASD, then save the data using DUPTAP to the tape drives reducing the backup window where
the system is unavailable to users.  There are a lot of pieces to consider in setting up and using Virtual
tape drives.  The block size must match the physical backup device block capabilities you will be using.
The  following helps to show that even if your workload is large file you may not gain anything in your
back up window even using the virtual tape drives.  If your tape drive uses smaller block sizes your
virtual tape drive must use small blocks

IBM i 6.1 Performance Capabilities Reference - January/April/October 2008

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 Copyright IBM Corp. 2008