Balancing Disk Usage
If your server's disk is a performance bottleneck, you can do one or more of the following:
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Move Microsoft Exchange Server transaction logs to another physical disk or another physical disk that is using a disk controller other than the one used by the databases.
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Restrict the amount or type of mail users can send.
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Add more RAM and run Performance Optimizer to increase the database buffers.
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Add more disks to the stripe set.
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Use multiple disk controllers.
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Add one or more caching disk controllers that cache read and write operations.