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Performance Considerations
Appendix AA-12
Image Backup Versus Filesystem
It used to be more efficient to back up images (raw volumes) instead of
backing up filesystems. This can still be true in some cases, such as with
heavily-loaded systems or if the disks contain a large number of
scattered files. The general recommendation is to use the filesystem
backup.
Object Distribution to Media
There are many ways to configure a backup such that the backup data
ends up on the media in just as many different configurations. For
example:
• One object goes to one medium, or
• Several objects go to several media, each medium contains data from
each object
Under certain conditions, one distribution may be advantageous
considering the backup performance, however this may not be the
optimal restore configuration.
The challenge is to optimize the setup for a backup (since it is done
frequently) and at the same time have an acceptable restore media
situation.
Miscellaneous Performance Hints
•Patches:
Ensure you have installed all patches pertaining the performance on
the network.
• On the computers that are Media Agent and Disk Agent clients, set
the IP as shown below:
IP is local "<MA_And_DA_Client_name>" == true
•LAN Cards:
If you use a FDDI card, you can move it up on the bus so that it
receives a higher priority. Use ftp to transfer large files between the
MA and DA systems to see how the speed compares to Data Protector
performance. The network cards configured in half-duplex decrease
the performance.
• Simulating a high-speed device: