ArGest Backup User Guide

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Double Buffering: (-D)

If your system uses System V shared memory (your system administrator can tell you if it does), then depending on the constraints of the archive device driver, using double buffering (the -D option) can sometimes show a dramatic increase in the I/O rate of the archive device. It is not uncommon to see the speed increase by a factor of two. Unfortunately, it is also not uncommon to see the speed decrease slightly also. This feature is very hardware and software dependent, and the only way to discover if you should use it for a particular device is to try it and see if it helps.