We are using Cassandra 2.1.13 with each node having a NVMe disk with the 
configuration of Total Capacity - 1.2TB, Alloted Capacity -  880GB. We would 
like to increase the default value of 32 for the param concurrent_reads. But 
the document says 

"(Default: 32)note For workloads with more data than can fit in memory, the 
bottleneck is reads fetching data from disk. Setting to (16 × number_of_drives) 
allows operations to queue low enough in the stack so that the OS and drives 
can reorder them. The default setting applies to both logical volume managed 
(LVM) and RAID drives."


According to this hardware specification, what could be the optimal value that 
can be set for concurrent_reads?

Best Regards,


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