Jeff, thank you very much for reply. Will try to use 4TB per instance. If I understand it correctly level compaction can lead to 50% https://docs.datastax.com/en/dse-planning/doc/planning/planningHardware.html
Regarding the question of running multiple instances per server, am I correct that in case of 3.11 instances and having several disks dedicated for each instance, running multiple instances per server is ok? On Thu, Jul 12, 2018 at 5:47 PM Jeff Jirsa <jji...@gmail.com> wrote: > > 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 > --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org For additional commands, e-mail: user-h...@cassandra.apache.org
