Stuart Anderson wrote: > As an artificial test, I created a filesystem with compression enabled > and ran "mkfile 1g" and the reported compressratio for that filesystem > is 1.00x even though this 1GB file only uses only 1kB. >
ZFS seems to treat files filled with zeroes as sparse files, regardless of whether or not compression is enabled. Try "dd if=/dev/urandom of=1g.dat bs=1024 count=1048576" to create a file that won't exhibit this behavior. Creating this file is a lot slower than writing zeroes (mostly due to the speed of the urandom device), but ZFS won't treat it like a sparse file, and it won't compress very well either. -Luke _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
