Muhlestein, Mark wrote:
The snapshot folding happens in WAFL of course, but the trigger to cause a file to be scanned happens based on CIFS requests. If an NFS client overwrites a file with identical data it will result in new allocations. If a CIFS client does that when the folding option is "on" it will not result in new allocations if the old blocks are in the last snapshot. This works even if the data is written to a temp file which is subsequently renamed to the original file, as Windows applications typically do.
At some point we plan to add support for NFS, and/or to add a way to manually force a folding scan on a directory, etc. If people are interested in this let me know so I can add your comments to the feature request.
Mark Muhlestein -- Network Appliance Engineering
Hello Mark
You are right. File folding currenty really is just CIFS not NFS. I read the manpage too fast. Sorry.
I think, this would be a cool feature for NFS-files, too. Especially for those "I backup my local PCs files to the filer" guys ... One more request for enhancement: Due to the performance impact of file folding (ff) ...: How about moving this ff option from a system wide range to a volume based option? Therefore I could create one volume for NFS-Backups and CIFS users with the low(er) ff performance and one without ff for the other NFS-clients...
Just my 2 cents.
Best regards! Dirk