Part V. Optimizing DRBD performance
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Part V. Optimizing DRBD performance
Table of Contents
14. Measuring block device performance
14.1. Measuring throughput
14.2. Measuring latency
15. Optimizing DRBD throughput
15.1. Hardware considerations
15.2. Throughput overhead expectations
15.3. Tuning recommendations
15.3.1. Setting
max-buffers
and
max-epoch-size
15.3.2. Tweaking the I/O unplug watermark
15.3.3. Tuning the TCP send buffer size
15.3.4. Tuning the Activity Log size
15.3.5. Disabling barriers and disk flushes
16. Optimizing DRBD latency
16.1. Hardware considerations
16.2. Latency overhead expectations
16.3. Tuning recommendations
16.3.1. Setting DRBD’s CPU mask
16.3.2. Modifying the network MTU
16.3.3. Enabling the
deadline
I/O scheduler