Re: AHCI problem with hotplug

[raz ben yehuda <razb@bitband.com>]

i have many other problems with SuperMicro. I believe it has to do with the 
backpanel. I occasions when disks simply vanish.
I suggest you try the same thing on other machines.
On Monday 29 December 2008 16:51, Tony Battersby wrote:
> Tejun Heo wrote:
> > Tony Battersby wrote:
> >> I am having a problem getting Linux to detect hot-plugged SATA disks on
> >> my ICH7 AHCI controller (SuperMicro PDSME motherboard).  On any SATA
> >> port that already had a disk plugged in during BIOS POST, Linux will see
> >> the disk and detect hot-plug and hot-unplug events just fine.  On any
> >> SATA port that did not have a disk plugged in during BIOS POST, Linux
> >> will not see a disk no matter what.  Here are the different sequences of
> >> events that I have tried:
> >>
> >> 1) boot with SATA disk plugged in
> >>    modprobe ahci: disk detected
> >>    unplug disk:   disk deleted
> >>    plug in disk:  disk detected
> >>
> >> 2) boot with SATA disk plugged in
> >>    unplug disk
> >>    modprobe ahci
> >>    plug in disk: disk detected
> >>    unplug disk:  disk deleted
> >>    plug in disk: disk detected
> >>    unplug disk:  disk deleted
> >>    plug in disk to any other SATA port    -> not detected
> >>    plug in disk to the original SATA port -> disk detected
> >>
> >> 3) boot with SATA disk unplugged
> >>    plug in disk to any SATA port
> >>    modprobe ahci: not detected
> >>    grep ahci /proc/interrupts: 0 interrupts
> >>
> >> 4) boot with SATA disk unplugged
> >>    modprobe ahci
> >>    plug in disk to any SATA port: not detected
> >>    grep ahci /proc/interrupts: 0 interrupts
> >>
> >> 5) keep SATA disk plugged in during BIOS POST but unplug it before the
> >>    kernel boots
> >>    kernel hangs at "BIOS data check"
> >>
> >> I have tried both 2.6.24.7 and 2.6.27.8 with the same result.
> >>
> >> The BIOS is configured as follows:
> >> Parallel ATA:         [Enabled]
> >> Serial ATA:           [Enabled]
> >> SATA Controller Mode: [Enhanced]
> >> SATA RAID:            [Disabled]
> >> SATA AHCI:            [Enabled]
> >>
> >> The root filesystem is on a parallel IDE disk using the legacy
> >> (non-libata) piix driver.
> >
> > The BIOS could be tristating the ports.  Does it work if you issue
> > manual rescan (echo - - - > /sys/class/scsi_host/hostN/scan)?
>
> No luck.  I get:
>
> ata1: hard resetting link
> ata1: SATA link down (SStatus 0 SControl 0)
> ata1: EH complete
>
> And the drive isn't seen.
>
> Tony
>
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