One of our GFS filesystems tends to have a large number of very small files, on average about 1000 bytes each. I realized this week we'd created our filesystems with default options. As an experiment on a test system, I've recreated a GFS filesystem with "-b 1024" to reduce overall disk usage and disk bandwidth. Initially, tests look very good—single file creates are less than one millisecond on average (down from about 5ms each). Before I go very far with this, I wanted to ask: Has anyone else experimented with the block size option, and are there any tricks or gotchas to report? (This is with CentOS 5.5, GFS 1.) -Jeff |
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