Hello Sanjeev, Wednesday, August 30, 2006, 3:26:52 PM, you wrote:
SB> Hi, SB> We were trying out the "compression=on" feature of ZFS and were SB> wondering if it would make SB> sense to have ZFS do compression only on a certain kind of files (or SB> rather the otherway around). SB> Our observation : SB> - If ZFS finds that it cannot achieve a certain amount of compression it SB> does not compress the file. SB> However, to figure this out ZFS would have to first compress the SB> block's data. This means ZFS ends SB> up consuming resources and that overhead is not worth it. SB> Is the above observation correct. If so, is there someway this can be SB> tuned/controlled ? right now it's 12% minimum compression gain required. Unfortunately last I checked it was hard-coded. Additionally it's not file based but block based so for large files which are already compressed zfs during writing will try to compress block by block. SB> If not how about having a feature where we could tell ZFS something like : SB> " Don't try to compress the .gz files" ? We could probably use the SB> magic number of the file to SB> identify the type. SB> Does this make sense ? Or is this a stupid idea ? I guess some functionality like this would be great. IIRC it was also proposed by someone from ZFS team long time ago :) -- Best regards, Robert mailto:[EMAIL PROTECTED] http://milek.blogspot.com _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
