2048 Latency Monitoring Virtualization 
Brendan Gregg
AUGUST 18, 2019
For example, iostat(1), or a monitoring agent, may tell you your average disk latency, but not the distribution of this latency. For smaller environments, it can be of more use helping eliminate latency outliers. Block I/O latency as a histogram. This traces block I/O, and shows latency as a power-of-2 histogram.
SQL Server According to Bob
JANUARY 11, 2020
The caching of data pages and grouping of log records helps remove much, if not all, of the command latency associated with a write operation. The following table outlines the virtual protection states. Page State Virtual Protection State Dirty Read Write during the modification.
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