This is the shared transaction log that gets created to back any reliable collections for stateful services.
SharedLogSizeInMB specifies the number of MB of disk space to statically pre-allocate for the default shared log on all nodes. The value must be 2048 or larger. You can find these files under - D:\SvcFab\ReplicatorLog
The global reliable service configuration is specified in the cluster manifest for the cluster under the KtlLogger section. It allows configuration of the shared log location and size plus the global memory limits used by the logger.
You can alter this by changing the setting as below –