Apple Xsan is an incredibly high-performance, fibre-channel, clustered file system configured as RAID within a storage area network (SAN).
The storage hardware consists of data servers (usually individually configured with RAID 3 or RAID 5, and then striped with each other) and separate Metadata servers which, unsurprisingly, containg the Metadata for the user data stored on the data servers. The Metadata typically makes up around 10% of the total data capacity.
Data recovery of Xsan is incredibly complex, and a task that only a handful of companies in the world are able to carry out, with Retrodata being one of them.
