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7.1. Optimization Factor

Optimization of DRX is accomplished by adjusting the DRX internal parameters or by changing the settings of the system so that the buffering and compression functions provided by DRX can achieve optimal performance. The performance of DRX can be buffered up to 6 to 7 Gbps in a 10 Gbps network, and it can be said that the performance is adequate when the compression is 1.5 times more than that. However, these high-performance processing results ​​are based on the assumption that the DRX transmission network bandwidth of the TX side is sufficient, and usually can not show such throughput in the WAN interval. Therefore, in the case of such a high level I/O load state, It is difficult to optimize the performance of DRX in situations where random high level I/O load occurs in such a low transmission band, and it is necessary to check the bandwidth situation of WAN section in advance through proper level simulation for I/O load. DRX provides the drbdsim tool to perform these checks.

In general, the network bandwidth can be checked with tools such as iperf, and iperf calculates the maximum bandwidth the network can make. drbdsim injects I/O load into DRX from local drbdsim and receives remote relayed data from remote drbdsim to calculate the throughput that DRX can process on the network. Therefore, DRX will perform best when iperf's result is equal to drbdsim's or when drbdsim's is greater than it by compression.

Based on the above, the factors of optimization are summarized as follows:

  • Replication I/O load
  • Network Bandwidth
  • DRX Buffering
  • Compression


Latency and throughput optimization on the local I/O side should be handled with optimization on the replication side. For this, please refer to the following.


7.2. Performance Indicator

Performance for the DRX can be viewed through the CLI commands provided by the DRX.

  • Buffer: memusage
  • Compression: statistics

7.3. Optimization procedure

7.3.1 Adjust the buffer size

7.3.2 Adjusting the number of compressing threads

7.4. Others

For DRX Appliance, you can perform optimizations on the local replication I/O reception intervals that work with DRBD. DRX is primarily designed to perform buffering in the application address space, so performance may vary depending on the receiving performance of the OS kernel of the appliance, which is directly linked to DRBD. Therefore, you can tune the receive buffer of this OS kernel socket to further enhance RX receive performance. To ensure that the OS kernel has enough receive buffers, it is necessary to apply the following to the OS kernel.








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