This benchmark can provide you with a relevant measure of your hard disk subsystem, which is frequently the bottleneck of a ]po[ installation.
In order to execute the benchmark, please open up a Linux shell (or Windows Cygwin) and type:
# dd if=/dev/zero of=/path/to/postgresql/filesystem/test bs=1024k count=10240 oflag=direct
Please make sure the target file system has sufficient free space for a 10G test file.
The oflag=direct option tells Linux to write directly to the hard disk subsystem, eliminating the effect of memory as a buffer.
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