>> Creating a slice, instead of using the whole disk, will cause ZFS to >> not enable write-caching on the underlying device.
> Correct. Engineering trade-off. Since most folks don't read the manual, > or the best practices guide, until after they've hit a problem, it is really > just a CYA entry :-( It seems this trade-off can now be mitigated, regarding Roch Bourbonnais comment on a another thread on this list: - http://mail.opensolaris.org/pipermail/zfs-discuss/2009-January/054587.html In particular: " If ZFS owns a disk it will enable the write cache on the drive but I'm not positive this has a great performance impact today. It used to but that was before we had a proper NCQ implementation. Today I don't know that it helps much. That this is because we always flush the cache when consistency requires it." -- julien. http://blog.thilelli.net/ _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
