Alexander Motin <mav_at_FreeBSD.org> writes: > Dag-Erling Smørgrav <des_at_des.no> writes: > > 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. > Have you ever seen them documented? ISTR I got the info from sos_at_ at some point. I have several Promise cards lying around and was working onm RAID5 offloading, but I stopped when ZFS became usable. > Does the need to specifically handle dozens of incompatible > implementations with limited resources worth those (probably not > major) benefits? The details probably vary from controller to controller, but the capabilities are pretty much the same: perform the same write operation to several disks at once, split a write operation across several disks, compute and write parity. IIRC, composite writes are already supported but not used. DES -- Dag-Erling Smørgrav - des_at_des.noReceived on Tue Apr 27 2010 - 12:17:03 UTC
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