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106 Modes of Usage and Optimizing Performance
drive to keep the drive running at best performance. When using Ultrium 2
cartridges, the ATS range is 10–30 MB/s, so, if possible data transfer should
remain within this range. In most cases, the backup application will provide
details of the average time taken at the end of the backup.
Note For optimum performance always use Ultrium 2 400 GB
cartridges. If you are using Ultrium 1 200 GB cartridges, the
ATS range is 6.6-20 MB/s.
Performance Checklist
The following list summarizes factors that can affect performance. They
provide guideline only of areas that may need further investigation. They do
not attempt to explain how to configure individual systems. For a more
detailed discussion, including information about tools that allow you to test
performance, refer to our white papers on
www.hp.com
. (Select the product
first and look at the Information Library.)
3
Is the tape drive reading and writing data at the correct speed?
3
Is the source system (hard disk) transferring data at the correct speed?
3
Is the backup application writing buffers at the correct speed? You may
need to tune the transfer, buffer and block size settings to optimize the
speed that the application writes data to the tape drive. HP Ultrium drives
have an internal buffer of 64 MB.
3
Is the operating system tuned for performance? You may need to adjust
the data transfer packet size.
3
If you are in a SAN environment, are you are using one of the
recommended fibre channel/SCSI routers?
3
Are user applications, such as Exchange or database servers, optimized
for backup performance?
3
Are there other factors that could be affecting performance, such as
interference or fibre channel infrastructure?