I have customer that is looking to use WASAS 4.1.1 to accelerate their existing DFS based infrastructure. Basically, they have file servers located in each branch. These file servers consume about 500-1TB of disk space per server. Mainly large construction drawing files in .pdf,.tiff, and .jpeg formats. If they are using DFS to control file coherency of certain folders between the branch, will WAAS/WAFS still offer them CIFS accleration for the replication of these files across the WAN?
Depending on what replication tool they are using, WAAS can definitely accelerate the file replication. Some replication tools don't play well with your coherency models and WAAS, so I would definitely test it. Obviously compression and encryption would raise havoc with acceleration, however copy utilities using CIFS should work well. Even if you don't get full CIFS acceleration (I would assume most of the files are new), DRE and LZ should really do well in this situation as well.
Hope that helps,