Switch from legacy ata(4) to CAM-based ATA

[Sergey Kandaurov]

On 6 May 2011 12:33, Alexander Motin <mav at freebsd.org> wrote:
> Sergey Kandaurov wrote:
>> XENHVM uses it's own naming scheme and can name disks as daN or adN,
>> depending on virtual block device id. atapci0/ata0/ata1 devices still present
>> there (such as in Bruce Cran's dmesg), but no any disks attached from it:
>> instead, all of them hung from device/vbd/N.
>> [In a non-XENHVM mode they are attached from ataN channels, as usual.]
>>
>> /*
>>  * Translate Linux major/minor to an appropriate name and unit
>>  * number. For HVM guests, this allows us to use the same drive names
>>  * with blkfront as the emulated drives, easing transition slightly.
>>  */
>>
>> xenbusb_front0: <Xen Frontend Devices> on xenstore0
>> xenbusb_back0: <Xen Backend Devices> on xenstore0
>> xctrl0: <Xen Control Device> on xenstore0
>> xbd0: 17000MB <Virtual Block Device> at device/vbd/768 on xenbusb_front0
>> xbd0: attaching as ad0
>> GEOM: ad0s1: geometry does not match label (16h,63s != 255h,63s).
>> xbd1: 3812MB <Virtual Block Device> at device/vbd/2048 on xenbusb_front0
>> xbd1: attaching as da0
>> xbd2: 114439MB <Virtual Block Device> at device/vbd/2064 on xenbusb_front0
>> xbd2: attaching as da1
>
> OK, interesting question. I have built amd64 XENHVM kernel and booted it
> under Xen 3.2. As result I've got double set of devices, via both
> atapci0/ata0 and via blkfront:
>
> ada0 at ata0 bus 0 scbus0 target 0 lun 0
> ada0: <QEMU HARDDISK 0.9.0> ATA-7 device
> ada0: Serial Number QM00001
> ada0: 16.700MB/s transfers (WDMA2, PIO 8192bytes)
> ada0: 476940MB (976773168 512 byte sectors: 16H 63S/T 16383C)
> ada0: Previously was known as ad0
> ada1 at ata0 bus 0 scbus0 target 1 lun 0
> ada1: <QEMU HARDDISK 0.9.0> ATA-7 device
> ada1: Serial Number QM00002
> ada1: 16.700MB/s transfers (WDMA2, PIO 8192bytes)
> ada1: 476940MB (976773168 512 byte sectors: 16H 63S/T 16383C)
> ada1: Previously was known as ad1
> xbd0: 476940MB <Virtual Block Device> at device/vbd/768 on xenbusb_front0
> xbd0: attaching as ad0
> xbd1: 476940MB <Virtual Block Device> at device/vbd/832 on xenbusb_front0
> xbd1: attaching as ad1
> Both of them were exported to GEOM. Extra set of adX devices caused
> error messages. What am I doing wrong and why have I got those
> duplicates? Was I required to remove non-PV drivers from my kernel?

Doh. This corresponds to errors omitted unintentionally in my previous mail.
This is right after "xbd2: attaching as da1":

da0 at sym0 bus 0 scbus2 target 0 lun 0
da0: <QEMU QEMU HARDDISK 0.10> Fixed Direct Access SCSI-3 device
da0: 3.300MB/s transfers
da0: Command Queueing enabled
da0: 3812MB (7807527 512 byte sectors: 255H 63S/T 485C)
can't re-use a leaf (led)!
g_dev_taste: make_dev_p() failed (gp->name=da0, error=17)
da1 at sym0 bus 0 scbus2 target 1 lun 0
da1: <QEMU QEMU HARDDISK 0.10> Fixed Direct Access SCSI-3 device
da1: 3.300MB/s transfers
da1: Command Queueing enabled
da1: 114439MB (234372222 512 byte sectors: 255H 63S/T 14588C)
can't re-use a leaf (led)!
g_dev_taste: make_dev_p() failed (gp->name=da1, error=17)

No ada devices detected though.

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