Brendan Gregg
MAY 8, 2021
From these outputs I try to determine if the problem is: - **The workload**: High-latency disk I/O is commonly caused by the workload applied. It may be due to queueing, especially from file systems that send a batch of writes. Rotational disks have extra latency from head seeks for random I/O, and spin ups from the idle state.
Brendan Gregg
MAY 8, 2021
From these outputs I try to determine if the problem is: - **The workload**: High-latency disk I/O is commonly caused by the workload applied. It may be due to queueing, especially from file systems that send a batch of writes. Rotational disks have extra latency from head seeks for random I/O, and spin ups from the idle state.
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Brendan Gregg
MAY 8, 2021
From these outputs I try to determine if the problem is: - **The workload**: High-latency disk I/O is commonly caused by the workload applied. It may be due to queueing, especially from file systems that send a batch of writes. Rotational disks have extra latency from head seeks for random I/O, and spin ups from the idle state.
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. system(".") Block I/O latency as a histogram. BCC is great for canned complex tools and agents.
SQL Server According to Bob
JANUARY 11, 2020
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