UFS vs. ZFS inside bhyve hosted on ZFS

[Paul Vixie]

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.

-- 
P Vixie