This can be calculated as 1/2 the NVRAM size for stand-alone systems, 1/4 the NVRAM size for clustered systems, and 1/8 the NVRAM size for 4/8-node MetroClusters. As soon as the process to log to loca...This can be calculated as 1/2 the NVRAM size for stand-alone systems, 1/4 the NVRAM size for clustered systems, and 1/8 the NVRAM size for 4/8-node MetroClusters. As soon as the process to log to local NVRAM and the HA partner is confirmed, the controller acknowledges the write as completed to the client machine (app, protocol?). During the writing phase of one memory buffer, the second memory buffer and NVRAM space ( both local and remote ) are used to store and acknowledge incoming writes.