Re: Running multiple instances on a single server --micrandra ??

2010-12-10 Thread Edward Capriolo
On Thu, Dec 9, 2010 at 10:40 PM, Bill de hÓra b...@dehora.net wrote: On Tue, 2010-12-07 at 21:25 -0500, Edward Capriolo wrote: The idea behind micrandra is for a 6 disk system run 6 instances of Cassandra, one per disk. Use the RackAwareSnitch to make sure no replicas live on the same node.

Re: Running multiple instances on a single server --micrandra ??

2010-12-10 Thread Edward Capriolo
On Fri, Dec 10, 2010 at 11:39 PM, Edward Capriolo edlinuxg...@gmail.com wrote: On Thu, Dec 9, 2010 at 10:40 PM, Bill de hÓra b...@dehora.net wrote: On Tue, 2010-12-07 at 21:25 -0500, Edward Capriolo wrote: The idea behind micrandra is for a 6 disk system run 6 instances of Cassandra, one

Re: Running multiple instances on a single server --micrandra ??

2010-12-09 Thread Ryan King
Overall, I don't think this is a crazy idea, though I think I'd prefer cassandra to manage this setup. The problem you will run into is that because the storage port is assumed to be the same across the cluster you'll only be able to do this if you can assign multiple IPs to each server (one for

Re: Running multiple instances on a single server --micrandra ??

2010-12-09 Thread Bill de hÓra
On Tue, 2010-12-07 at 21:25 -0500, Edward Capriolo wrote: The idea behind micrandra is for a 6 disk system run 6 instances of Cassandra, one per disk. Use the RackAwareSnitch to make sure no replicas live on the same node. The downsides 1) we would have to manage 6x the instances of

Re: Running multiple instances on a single server --micrandra ??

2010-12-08 Thread Anand Somani
Interesting idea, . If it is like dividing the entire load on the system by 6, so if the effective load is still the same and used SSD's for commit volume we could get away with 1 commitlog SSD. Even if these 6 instances can handle 80% of the load (compared to 1 on this machine), that might be

Running multiple instances on a single server --micrandra ??

2010-12-07 Thread Edward Capriolo
I am quite ready to be stoned for this thread but I have been thinking about this for a while and I just wanted to bounce these ideas of some guru's. Cassandra does allow multiple data directories, but as far as I can tell no one runs in this configuration. This is something that is very

Re: Running multiple instances on a single server --micrandra ??

2010-12-07 Thread Jonathan Ellis
The major downside is you're going to want to let each instance have its own dedicated commitlog spindle too, unless you just don't have many updates. On Tue, Dec 7, 2010 at 8:25 PM, Edward Capriolo edlinuxg...@gmail.com wrote: I am quite ready to be stoned for this thread but I have been