June 26, 2017 – Alert: Data Corruption with Mixed Endian Mirror Shadowing
InterSystems has corrected a defect that may result in corruption of Unicode data on a shadow system whose source is an async mirror member.
This defect affects all currently released Caché, Ensemble, and HealthShare distributions beginning with version 2012.2.0. All platforms and operating systems are affected.
In order to be exposed to the risk the configuration must include mirror primary and async members, and a shadow of the async member. Additionally, the async member must be of different endian than both the primary mirror member and the shadow.
Primary (endian X) -> Async (endian Y) -> Shadow (endian X)
In the above configuration, some Unicode strings greater than 255 characters on the shadow member may be corrupt for databases that are shadowed from the async