Write performance with gfs2 filesystem

Applications which either write to a single file from multiple nodes or which insert/remove lots of files from a single directory will be slow. This is the single most frequently asked question regarding GFS/GFS2 performance and often occurs in relation to email/imap spool directories. The answer in each case is to break up the single large spool into separate directories, and to try to keep each set of files “local” to one node, as far as possible.

Likewise, don’t try to mmap() a file and use it as distributed shared memory: it will work, but it will be so slow that it makes no sense to do so.
Source here.

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