DRBD Proxy's Buffer Warning Messages

This article will help you identify whether your DRBD Proxy buffer is large enough for your replication workload. This information applies to DRBD Proxy version 3.

If you see messages like this:

No memory found for <connection-string>: <bytes> of <bytes> used, needed <bytes> bytes

⚠️ WARNING: The above message is shown by versions prior to 3.2.8 (Sep 2019) while the following message is shown by newer builds of DRBD Proxy.

Temporary memory shortage on <host>: <bytes> of <bytes> used, needed <bytes> bytes

This means DRBD Proxy’s buffers have become full. You can increase the amount of memory allocated to DRBD Proxy by increasing the memlimit setting in the DRBD® configuration. If this value is already relatively large, you likely need a faster replication network between nodes to keep up with the I/O workloads on the DRBD device.

proxy {
  memlimit <megabytes>M;
  ...
}

Reviewed 2020/12/01 – DGT