>On 06/05/2010 21:07, Erik Trimble wrote: >> VM images contain large quantities of executable files, most of which >> compress poorly, if at all. > >What data are you basing that generalisation on ? > >Look at these simple examples for libc on my OpenSolaris machine: > >1.6M /usr/lib/libc.so.1* >636K /tmp/libc.gz > >I did the same thing for vim and got pretty much the same result.
>It will be different (probably not quite as good) when it is at the ZFS >block level rather than whole file but those to randomly choosen by me >samples say otherwise to your generalisation. Easy to test when "compression" is enabled for your rpool: 2191 -rwxr-xr-x 1 root bin 1794552 May 6 14:46 /usr/lib/libc.so.1* (The actual size is 3500 blocks so we're saving quite a bit) Casper _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
