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sendmail Performance Tuning by Nick Christenson

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3.4. File Space

Like any other types of data that can accumulate on disks, email queues come with their own data storage management issues. This section provides some advice on how to deal with these issues on busy email servers where many pending messages may be queued up for eventual delivery and where I/O performance is important.

3.4.1. Large Directory Issues

Two issues related to disk storage can affect performance of an email gateway: disk space and the number of files in any given directory. In almost all cases these days, disk space isn’t an issue for mail queues. Large disks are cheap. Instead, for mail systems I/O bandwidth is a greater concern than storage capacity. For performance-sensitive systems, an entire disk is likely to be ...

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