Probe System For Replication Monitoring

A method of probing replication paths in a computer system, the method comprising:

• creating a new instance of a probe system on a first replica computer system, the probe system including a probe head and a probe echo;
• creating a target record on a second replica computer system, the target record including a head field and an echo field, wherein the head field includes an epoch value and a time stamp and the echo field includes an epoch value and a latency value;
• updating the epoch value and the time stamp in the head field;
• updating the epoch value and the latency value in the echo field, if the epoch value in the echo field is less than the epoch value in the head field, the latency value being a measurement of time to communicate between the first and second replica computer systems;
• and
• obtaining a report that gives the communication latency for any communication starting in the first replica computer system and ending in the second replica computer system.

A non-transitory machine readable storage medium comprising one or more sequences of instructions for probing replication paths in a computer system, which, when executed by one or more processors, perform a method comprising the steps of:

• creating a new instance of a probe system on a first replica computer system, the probe system including a probe head and a probe echo;
• creating a target record on a second replica computer system, the target record including a head field and an echo field, wherein the head field includes an epoch value and a time stamp and the echo field includes an epoch value and a latency value;
• updating the epoch value and the time stamp in the head field;
• updating the epoch value and the latency value in the echo field, if the epoch value in the echo field is less than the epoch value in the head field, the latency value being a measurement of time to communicate between the first and second replica computer systems;
• and
• obtaining a report that gives the communication latency for any communication starting in the first replica computer system and ending in the second replica computer system.