On Apr 27, 2010, at 7:34 AM, Dag-Erling Smørgrav wrote: > Maxim Sobolev <sobo...@freebsd.org> writes: >> Richard Tector <richardtec...@thekeelecentre.com> writes: >>> Could I also add that the removal of ataraid would affect those >>> users who dual-boot with Windows and rely on the psuedo-raid >>> provided by most Intel chipsets to be able to share the same pair of >>> disks. >> Well, this won't be a problem if we have GEOM classes that can >> understand metadata created by the ATA RAID BIOS(es). > > Most pseudo-raid kit has nifty features like checksum offloading, > composite writes etc. which can improve performance considerably. You > can't access those from GEOM.
If my "most" you mean "a small subset of vendors and products", then yes, you're correct. For the vast remaining majority, all you get is a special BIOS that can do striping and mirroring at boot. Sometimes that special BIOS requires a special hook in the controller chip, which is why you have ICHxxR vs ICHxx chips, for example. All the 'R' means is that the silicon supports an external ROM. Scott _______________________________________________ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
