UFS vs. ZFS inside bhyve hosted on ZFS

[Russell L. Carter]

On 03/19/16 20:45, Paul Vixie wrote:
>
>
> Russell L. Carter wrote:
>>
>>
>> On 03/19/16 20:13, Paul Vixie wrote:
>>>
>>>
>>>> root at vm1:~ # ahcich0: Timeout on slot 29 port 0
>>>> ahcich0: is 00000008 cs 00000000 ss 00000000 rs bfffffff tfd 50 serr
>>>> 00000000 cmd 0001dd17
>>>> (ada0:ahcich0:0:0:0): WRITE_FPDMA_QUEUED. ACB: 61 40 70 dc 3a 40 00 00
>>>> 00 00 00 00
>>>> (ada0:ahcich0:0:0:0): CAM status: Command timeout
>>>> (ada0:ahcich0:0:0:0): Retrying command
>>>
>>> two questions:
>>>
>>> why ada rather than vtblk?
>>
>> No idea. I chose the default UFS selection in the iso installer.
>> Happy to change it to something better.
>
> you're starting your bhyve with a -s that specifies the ahci-hd driver.
> the guest kernel therefore sees an 'ahcich0' device.
>
> if you start bhyve with a -s that specifies the virtio-blk driver, then
> your guest kernel will see a 'vtblk' device.
>
> this may matter, since the kernel timeout you showed was in the ahci
> driver. i have never used this driver in bhyve.
>

Ah!  Ok, that makes sense.  I have been hacking on the script already
so it's going to be a day or so before I report back.  I want
everything easily reproducible.

Thanks,
Russell