Jerome Herman <jher...@dichotomia.fr> wrote: > >> Jul 24 23:48:36 mydavid kernel: ad6: FAILURE - READ_DMA48 > >> status=51<READY,DSC,ERROR> error=40<UNCORRECTABLE> LBA=1671887488 > >> Jul 24 23:48:36 mydavid kernel: > >> g_vfs_done():stripe/backup[READ(offset=1712012836864, > >> length=131072)]error = 5 > ... since they are ATA drives make sure you are using 80pins > ribbons and that DMA is properly activated in BIOS. > > You can also try to reduce DMA level, it must be on UDMA5 by > default, try using UDMA 4 (aka UDMA/66) or UDMA 3.
I fixed a similar problem -- involving a VIA 6421 controller -- a while back, by using atacontrol(8) to reduce the DMA speed from UDMA133 to UDMA100. Evidently it is possible, under some circumstances, for a device and controller to negotiate a speed that's too high to actually work :( _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
