Detecting data loss during site switchover

摘要

Techniques for detecting data loss during site switchover are disclosed. An example method includes storing at NVRAM of a first node a plurality of operations of a second node, the first and second nodes being disaster recovery partners. The method also includes during a switchover from the second node to the first node, receiving an indication of a first number of operations yet to be completed. The method further includes comparing the first number to a second number of operations in the plurality of operations stored at the NVRAM of the first node. The method also includes in response to the comparing, determining whether at least one operation is missing from the plurality of operations stored in the NVRAM of the first node. The method further includes in response to determining that at least one operation is missing, failing at least one volume.

主权项

1. A method, comprising:
storing, at a non-volatile random access memory (NVRAM) of a first node, a plurality of operations of a second node, the first node and the second node being disaster recovery partners; during a switchover from the second node to the first node, receiving an indication of a first number of operations yet to be completed by the second node; comparing the first number of operations yet to be completed to a second number of operations in the plurality of operations stored at the NVRAM of the first node to determine whether at least one operation yet to be completed by the second node is missing from the plurality of operations stored in the NVRAM of the first node; and in response to determining that at least one operation is missing:
performing a best effort replay of the plurality of operations of the second node; andfailing at least one storage volume.