> Actually we use Cassandra on ZFS (OpenSolaris) - fine tuned for our need. no > Raidcontroller used.
An interesting property of ZFS is the use of the ARC for caching. Contrary to the traditional behavior of buffer caches, the ARC should theoretically not evict all interesting data as a result of single sequential reads/writes of large files (without repeated access). Thus, I would expect that ZFS has the potential to give very even performance in terms of being less affected by compaction and memtable flush operations which otherwise (on e.g. traditional linux w/ xfs/jfs/etc) have a significant impact. That said I'd love to hear more about people's experiences. My only testing with Cassandra on ZFS has been on FreeBSD and the issue I had there was the tendency for bulk writes to cause poor latency on other I/O (when doing lots of writes I regularly have this issue on my desktop which runs freebsd/zfs) - but I am hoping that is specific to the FreeBSD port -- / Peter Schuller
