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복제 연결에서 지정된 프로토콜을 정의합니다. 지원되는 프로토콜은 다음과 같습니다.

  • A Writes to the DRBD device complete as soon as they have reached the local disk and the TCP/IP send buffer.

  • B Writes to the DRBD device complete as soon as they have reached the local disk, and all peers have acknowledged the receipt of the write requests.

  • C Writes to the DRBD device complete as soon as they have reached the local and all remote disks. 로컬 디스크 및 TCP/IP 전송 버퍼에 복사한 즉시 로컬 I/O 를 완료합니다.

  • B 로컬 디스크에 기록하고 피어에서 복제 데이터를 수신하는 즉시 ACK 를 반환합니다. 로컬에서 ACK 를 수신하면 I/O 를 완료 합니다.

  • C 로컬 디스크에 기록하고 피어에서 복제 데이터를 디스크에 기록한 후 쓰기 ACK 를 반환합니다. 로컬에서 쓰기 ACK 를 수신하면 I/O 를 완료합니다.

rcvbuf-size size

Configure the size of the TCP/IP receive buffer. A value of 수신 버퍼의 크기를 구성합니다. 값이 0(the default) causes the buffer size to adjust dynamically. This parameter usually does not need to be set, but it can be set to a value up to 10 MiB. The default unit is bytes.

rr-conflict policy

This option helps to solve the cases when the outcome of the resync decision is incompatible with the current role assignment in the cluster. The defined policies are:

  • disconnect No automatic resynchronization, simply disconnect.

  • violently Resync to the primary node is allowed, violating the assumption that data on a block device are stable for one of the nodes. Do not use this option, it is dangerous.

  • call-pri-lost Call the pri-lost handler on one of the machines. The handler is expected to reboot the machine, which puts it into secondary role.

shared-secret secret

Configure the shared secret used for peer authentication. The secret is a string of up to 64 characters. Peer authentication also requires the cram-hmac-alg parameter to be set기본값)이면 버퍼 크기가 동적으로 조정됩니다. 이 매개 변수는 일반적으로 설정하지 않아도 되지만 최대 10MiB의 값으로 설정할 수 있습니다. 기본 단위는 바이트이며 윈도우즈에선 지원하지 않습니다.

sndbuf-size size

Configure the size of the TCP/IP send buffer. Since DRBD 8.0.13 / 8.2.7, a value of 0 (the default) causes the buffer size to adjust dynamically. Values below 32 KiB are harmful to the throughput on this connection. Large buffer sizes can be useful especially when protocol A is used over high-latency networks; the maximum value supported is 10 MiB.

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