For regular read requests, Veritas File System (VxFS) only caches a single copy of a data page in the page cache for a given shared data block, even though the shared data block could be accessed from any of the FileSnaps or the source file. Once the shared data page is cached, any subsequent requests via any of the FileSnaps or the source file is serviced from the page cache. This eliminates duplicate read requests to the disk, which results in lower I/O load on the array. This also reduces the page cache duplication, which results in efficient usage of system page cache with very little cache churning when thousands of FileSnaps are accessed.