On Fri, February 3, 2012 10:03, Pete French wrote: > [...] But what I am talking about is the sector size > presneted by the 'fake' disc that a ZVOL creates - that always seems > to be 512 bytes, despite the fact that the zvol blocksize is 8k. Seems > odd to me (and that 8k size os alterable, but just doesnt seem to > be reflected in the zvol). As it stands I can make a zpool on top > of 4k discs, a ZVOL using 8k blocks on top of that, but the things > talking to it will use 512 byte chunks, which surely impacts performance ?
Try the following from the zfs(1M) man page: zfs create [-ps] [-b blocksize] [-o property=value] ... -V size volume [...] -b blocksize Equivalent to -o volblocksize=blocksize. If this option is specified in conjunction with -o volblocksize, the resulting behavior is undefined. http://www.freebsd.org/cgi/man.cgi?query=zfs Did use "blocksize" or "volblocksize" in your "zfs create" command? A thread for zfs-discus on "volblocksize": http://mail.opensolaris.org/pipermail/zfs-discuss/2005-November/000450.html _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"