Part V. Optimizing DRBD performance
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This guide describes DRBD version 8.4 and above. For 8.3 please look here.

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

This guide describes DRBD version 8.4 and above. For 8.3 please look here.

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13.7. Integrating Xen with Pacemaker Home Chapter 14. Measuring block device performance