Ryan - You (or maybe someone else) mentioned using RAID-0 instead of multiple data directories at the Cassandra hackathon as well. Could you explain the motivation behind that?
Thanks, Edmond On Mon, Apr 26, 2010 at 9:53 AM, Ryan King <r...@twitter.com> wrote: > I would recommend using RAID-0 rather that multiple data directories. > > -ryan > > 2010/4/26 Roland Hänel <rol...@haenel.me>: >> I have a configuration like this: >> >> <DataFileDirectories> >> <DataFileDirectory>/storage01/cassandra/data</DataFileDirectory> >> <DataFileDirectory>/storage02/cassandra/data</DataFileDirectory> >> <DataFileDirectory>/storage03/cassandra/data</DataFileDirectory> >> </DataFileDirectories> >> >> After loading a big chunk of data into cassandra, I end up wich some 70GB in >> the first directory, and only about 10GB in the second and third one. All >> rows are quite small, so it's not just some big rows that contain the >> majority of data. >> >> Does Cassandra have the ability to 'see' the maximum available space in >> these directory? I'm asking myself this question since my limit is 100GB, >> and the first directory is approaching this limit... >> >> And, wouldn't it be better if Cassandra tried to 'load-balance' the files >> inside the directories because this will result in better (read) performance >> if the directories are on different disks (which is the case for me)? >> >> Any help is appreciated. >> >> Roland >> >> >
