('binary' encoding is not supported, stored as-is) > >> Essentially the combination of SATA 3 speeds the midplane / backplane > >> degraded the connection between the MB and HDD enough to cause > >> the disks to randomly drop when under load. > >> > >> If we connected the disks directly to the MB with SATA cables the > >> problem went away. In the end we had midplanes changed from an > >> AHCI pass-through to active LSI controller. > >> > >> So if you have any sort of midplane / backplane connecting your disks > >> try connecting them direct to the MB / controller via known SATA 3.x > >> compliant cables and see if that stops the drops. > >> > >> Another test you can do is to force the disks to connect at SATA 2.x > >> this also fixed it in our case, but wasn't something we wanted to > >> put into production hence the controller swap. > >> > >> To force SATA 2 speeds you can use the following in /boot/loader.conf > >> where 'X' is disk identifier e.g. for ada0 X = 0:- > >> hint.ahcich.X.sata_rev=2 > > This is still worth trying as it could still indicate a problem > with your controller, cables or disks. > Or, simply disable the ahci kernel module and use only ata? -- Vladislav V. Prodan System & Network Administrator http://support.od.ua +380 67 4584408, +380 99 4060508 VVP88-RIPE Received on Sun Jan 27 2013 - 18:02:08 UTC
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