What is vm.min_free_kbytes and how to tune it?

Linux

vm.min_free_kbytes setting allows kernel to compute a minimum value in the low memmory zone and reserve it for its own use.

 

To read the current value

[Fri Mar 24 15:18:05 root@system:~]$sysctl vm.min_free_kbytes

vm.min_free_kbytes = 1888

To set new value of 4MB. Based on your system requirement configure the value. Ideally 1.8% is good enough.

echo 4096 > /proc/sys/vm/min_free_kbytes

To configure permenantly on every reboot add the below entry to /etc/sysctl.conf

vm.min_free_kbytes=4096

 

Source: What is vm.min_free_kbytes and how to tune it?

Scale Up vs Scale Out | Data Center Infrastructure | ServerWatch

servers

Scalability is a system’s ability to swiftly enlarge or reduce the power or size of computing, storage, or networking infrastructure thereby adapting to resource demands, optimizing costs, and improving the operations team efficiency.

Scaling up is adding further resources, like hard drives and memory, to increase the computing capacity of physical servers.
Scaling out is adding more servers to your architecture to spread the workload across more machines.

A good indicator of when to scale up is when your workloads start reaching performance limits, resulting in increased latency. Only the throughput can be increased, but when you hit any hardware bottleneck to extend the hardware, we need to scale out.

Based on use case , operational cost, rack space and forecasted workload demands, customer can choose to prefer scale up or scale out.

Source: Scale Up vs Scale Out | Data Center Infrastructure | ServerWatch