Hi, I also experience this problem.
my situation: Supermicro H8SCM-F (AMD SR5650+SP5100) PSU: redundant: 2x48A@12V (this is definitely not the problem) Ubuntu 10.04.2 x86_64 server SW-RAID6 over 6 devices (multiple) SW-RAID1 over 2 devices onboard AHCI + sata_mv (+ DVD @ sata_sil) problems only on high IO-load reproducable with _all_ schedulers (noop,anticipatory,cfq,deadline) reproducable with kernel options: noapic + acpi=off I suggest this is a problem in libata layer. We have some more similar linux boxes with much more drives and SW-RAID6 but they are driven by SAS-controllers. This problem is really important as our box is a storage server. I have the very same problem with an opensuse 11.2. (tested once) Any idea? My box is ready for tests for the next days/weeks. Any suggestions? Thanks -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/550559 Title: hdd problems, failed command: READ FPDMA QUEUED -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs