Michael, >> If that is the case, then here is what I would expect my values to >> be: sunit = 512 >> swidth = 4608 > > I think sunit should be as big as the RAID controllers stripe size, as > it describes the smallest I/O XFS should do. So sunit=512 would make it > possible that XFS writes a single sector, while the RAID controller > needs to read/write 256KB with your stripe size, resulting in > performance degradation. But I'm no XFS dev, so maybe wait for a > clearing from someone who has deeper XFS knowledge than me. > > sunit=262144 > swidth=9 > > Would be my suggestion for your setup. > IIRC sunit and swidth are both specified in units of 512 bytes (don't ask me why) so a sunit value of 512 would mean 256KB stripe size which is correct :-) If i am right, the FAQ should be corrected (hopefully some dev can confirm/deny it) cheers, Michael _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
