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How You Can Avoid Degraded Performance on a RAID Device

When you perform backup and restore operations on a RAID device using Arcserve Backup, you may observe data transfer rates that are significantly lower than expected. Consider the following possible sources of degraded performance:

• If you use high performance drives, you may need to limit the number of drives per adapter; connecting more than one drive to the same board can significantly reduce performance.
• The speed of the hard disk you want to back up or restore can limit performance. Ensure that you have a hard disk that is fast enough to keep up with the data capabilities of your RAID implementation.
• Degraded media in one or more of the media drives reduces performance.
• Other applications may be accessing the hard disk during backup. This may degrade performance due to hardware limitations.
• The performance of a RAID device depends on the speed of the slowest drive attached. For example, in a three-drive RAID level 0 configuration where drive 1=100 MB/min., drive 2=120 MB/min., and drive 3=120 MB/min., the total throughput is 300 MB/min. Keep this information in mind when coordinating drives for RAID.