Some notes from ~7 years of running in prod below - note though that none of 
this matters, the only thing that matters is benchmarking your load on your own 
hardware. Definitely run benchmarks and figure out what works for you.

166k/s is something you CAN hit with a 3-5 node cluster with the right data 
model, compaction strategy, and query pattern (mostly writes), or it could take 
you 10-15 nodes if you're doing tons of CAS or reads or using spinning disks or 
have tiny hardware.

How many bytes per insert? Are they all truly inserts or updates/upserts? Are 
you planning on using "IF NOT EXISTS"?

Historically offheap memtables have been faster than on heap for write only 
workloads
Historically stcs and twcs have been faster than LCS for write only workloads
SSDs typically better than spinning
CMS over G1 unless you can afford 16GB heap

-- 
Jeff Jirsa


> On Sep 13, 2017, at 10:43 PM, Avi Levi <a...@indeni.com> wrote:
> 
> Hi All,
> I plan to install cassandra on prem, we expect load of 10mil inserts per 
> minute . Are there any thumb rules for configuration, HW requirements, mem 
> allocation etc` ?
> 
> Thanks
> Avi

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