Hardware Latency Software White Paper 
Percona
APRIL 17, 2023
The CFQ works well for many general use cases but lacks latency guarantees. The deadline excels at latency-sensitive use cases ( like databases ), and noop is closer to no schedule at all. By default, most Linux installs use the CFQ ( Completely-Fair Queue ) scheduler. Two other schedulers are deadline and noop.
SQL Server According to Bob
JANUARY 11, 2020
This White Paper is for informational purposes only. Many high-end disk subsystems provide high-speed cache facilities to reduce the latency of read and write operations. Example 1: Hardware failure (CPU board) Battery backup on the caching controller maintained the data.
SQL Server According to Bob
JANUARY 11, 2020
This White Paper is for informational purposes only. For more information about I/O caching requirements and SQL Server, see the following white papers on MSDN.
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