dick hoogendijk wrote: > Vincent Fox wrote: > >>> Or perhaps compression should be the default. > > No way please! Things taking even more memory should never be the default. > An installation switch would be nice though. > Freedom of coice ;-)
Compression does not take more memory, the data is always uncompressed in the in kernel memory ARC anyway. Data on the L2ARC and ZIL devices is always uncompressed. Compression only impacts what is written to the main pool devices. Compression will use more CPU time, how much depends on which compression is choosen. Note that we already enable compression by default for most metadata (ZFS & POSIX layer) (using lzjb), the compression flag only impacts application supplied data. However I don't think compression should be the default setting for ZFS. It may however make sense for it to be explicitly set to "on" by the OpenSolaris installer for datasets that are root/usr/opt filesystems. I don't want to be burning CPU cycles attempting to compress most of the data I store on ZFS because most of it isn't compressible (Audio, Video, Image files and OpenDocument files (which are in a ZIP container)). -- Darren J Moffat _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
