Disclaimer: I'm no file systems expert. I recommend something with extents otherwise you might take a big performance hit while couch deletes old db files after compaction. Compression sounds cool as long as you can do it really fast (are there setups where this happens in hardware?).
reiserfs: According to wikipedia it "still uses the big kernel lock (BKL) — a global kernel-wide lock" which makes performance on multiple cores suffer. It's big benefit, as I always understood it, is being able to pack smile files together into single blocks. You will likely not have lots of small files with Couch :-P xfs: Delayed allocation might be a big performance win with a Couch. Since outstanding writes are committed together in chunks and then fsync'd all together I bet this feature would do good things for Couch performance. ext(3|4) I'd recommend ext4 over ext3. Delayed allocation like xfs as well as the multiblock allocator should make it much better than ext3. You also get extents. btrfs/zfs: Some of the features of each sound interesting, but nothing that stands out to me as "great for CouchDB". Snapshots and backups are cool, but Couch is doing this for you already in a sense due to the way the btree is appended: CouchDB documents are, in a sense, copy-on-write. Checksumming is cool if you think it's important for your data integrity. If you want snapshots for backup you can always use CouchDB replication. If you run any tests I'd be very, very interested in seeing your results. -Randall On Thu, Sep 16, 2010 at 03:11, Metin Akat <[email protected]> wrote: > I'm sure almost everybody out there is using ext4/3 (including me), > but what about filesystems like btrfs, zfs, reiserfs, xfs. Some of > them have very appealing feature-sets (like compression for example, > and we all know how greedy is couchdb for disk space). > And I know that for example btrfs is not yet "recommended for > production". But its time is coming. From what I see, Ubuntu 10.10 > works flawlessly on btrfs. > So I'd be happy if we have some discussion on the topic, instead of > "everybody uses ext4, just use it" kind of stuff :). > Couchdb was "alpha software" for years, and we all used it in > production, so we are not afraid of alpha/beta software, as long as > it's good :)
