On Wed, Aug 20, 2008 at 01:13:50PM -0700, James G. Sack (jim) wrote:
So I wonder which (controllers &) drives support write barriers. How does one find out? The hdparm help and manpage seem silent about it. I suppose there might be some parm in /sys/block/sda (or?), but I can't see anything obviously relevant.
If you have a partition to spare, you can make an XFS partition on it, and try mounting it. XFS complains loudly if it doesn't have barrier support. This is most notable because barriers don't seem to yet make it through LVM. Supposedly, XFS is a lot more robust with barriers, and there isn't all that significant of a performance change. It might be because it was designed with them in mind, instead of kind of using them as a slightly better alternative to writing everything synchronously. David -- KPLUG-List@kernel-panic.org http://www.kernel-panic.org/cgi-bin/mailman/listinfo/kplug-list
