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- It assumes DRBD asynchronous replication and Ahead mode (delayed replication) configuration.
- Ensure that only the I/O measurements of the interval during which the replication connection is maintained can be measured. The I/O measurements for the replication disconnect interval are not considered.
- The number of times DRBD enters Ahead mode (the number of congestion entries) is collected by the following method.
- Output count of "Congestion-fill threshold reached" on drbd log
- Check the number of Ahead entries through the drbdsetup events2 command
- Resizes the buffer based on the number of congestion entries collected. If the frequency of congestion is frequent, the size of the buffer should be increased.
- If the congestion interval does not decrease even though the buffer has been added, consider compression.
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4.
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Physical Memory Specifications
DRX's physical memory specifications are variable based on number of resources, maximum I/O, and network bandwidth. The following is a formula for DRX's physical memory specification when the maximum I/O is greater than the bandwidth.
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