Asad,

Ideally you should keep 50% free disk space. Yes, right now you have good 
option to scale horizontally or add more disk space if you can. Adding more 
nodes will give you more scalability for reads/writes and disk space will just 
give you more capacity  for current load.

Sent from my iPhone

> On May 19, 2017, at 11:04 AM, ZAIDI, ASAD A <az1...@att.com> wrote:
> 
> Hello Folks -
> 
> I'm using open source apache Cassandra 2.2 .My cluster is spread over 14 
> nodes in cluster in two data centers.
>  
> My DC1 data center nodes are reaching 2TB of consumed volume. we don't have 
> much space left on disk.
> 
> I am wondering if there is guideline available that can point me to certain 
> best practice that describe when we should add more nodes to the cluster.  
> should we add more storage or add more nodes. I guess we  should scale 
> Cassandra horizontally so adding node may be better option.. i am looking for 
> a criteria that describes node density thresholds, if there are any.
> 
> Can you guys please share your thoughts , experience. I'll much appreciate 
> your reply. Thanks/Asad
> 
>  
> 
>  

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