You can certainly go higher than a terabyte - 4 or so is common, Ive heard of people doing up to 12 tb with the awareness that time to replace scales with size on disk, so a very large host will take longer to rebuild than a small host
The 50% free guidance only applies to size tiered compaction, and given your throughput you may prefer leveled compaction anyway. With leveled you should target 30% free for compaction and repair You don’t need more than one Cassandra instance per host for 4tb but you may want to consider it for more than that - multiple instances are especially useful if you have multiple (lots of) disks and are running Cassandra before CASSANDRA-6696 (which made jbod safer). -- Jeff Jirsa > On Jul 12, 2018, at 7:37 AM, Vitaliy Semochkin <vitaliy...@gmail.com> wrote: > > Hi, > > Which amount of data Cassandra 3 server in a cluster can serve at max? > The documentation says it is only 1TB. > If the load is not high (only about 100 requests per second with 1kb > of data each) is it safe to go above 1TB size (let's say 5TB per > server)? > What will be safe maximum disk size a server in such cluster can serve? > > Documentation also says that compaction requires to have %50 of disk > occupied space. In case I don't have update operations (only insert) > do I need that much extra space for compaction? > > In articles (outside Datastax docs) I read that it is a common > practice to launch more than one Cassandra server on one physical > server in order to be able use more than 1TB of hard driver per > server, is it recommended? > > --------------------------------------------------------------------- > To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org > For additional commands, e-mail: user-h...@cassandra.apache.org > --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org For additional commands, e-mail: user-h...@cassandra.apache.org
