On 05/29/13 10:21, Oliver Fromme wrote: > Steven Hartland wrote: > > Have you checked your sata cables and psu outputs? > > > > Both of these could be the underlying cause of poor signalling. > > I can't easily check that because it is a cheap rented > server in a remote location. > > But I don't believe it is bad cabling or PSU anyway, or > otherwise the problem would occur intermittently all the > time if the load on the disks is sufficiently high. > But it only occurs at tags=3 and above. At tags=2 it does > not occur at all, no matter how hard I hammer on the disks. > > At the moment I'm inclined to believe that it is either > a bug in the HDD firmware or in the controller. The disks > aren't exactly new, they're 400 GB Samsung ones that are > several years old. I think it's not uncommon to have bugs > in the NCQ implementation in such disks. > > The only thing that puzzles me is the fact that the problem > also disappears completely when I reduce the SATA rev from > II to I, even at tags=32. > > Best regards > Oliver > >
Jeremy Chadwick knows of some hardware faults with IXP600/700, there may be more information on the freebsd-fs mailing list archives or if you can discuss with him: http://docs.freebsd.org/cgi/mid.cgi?20130414194440.GB38338 That email mentions port multipliers but the problems may extend beyond. _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"