Disk issues on Hyper-V

[David Arroyo]

How recently did you set it up? I'm trying to figure out if it's something that was broken with a recent release of Hyper-V or if it's something about my system that's messed up. Although if it's the latter I'm not sure why other operating systems work fine. I'm on Windows 10 Pro.

On Sat, Apr 4, 2020, at 16:34, Justin Sherrill wrote:
> I realize this is not the most helpful answer, but I didn't encounter this problem when I set up Hyper-V and DragonFly before. I ended up going to real hardware because I wanted to have DragonFly talking out of the serial port.
> 
> It might have been the Hyper-V image type that affected it, or the legacy BIOS option in the DragonFly installer as I had mentioned in my posts about it. Those are guesses, however, cause I don't have a Windows 10 machine handy that I can test this with anytime soon. My DragonFly machine that I ended up setting up for that experiment is currently broadcasting grdc output through a VT320 terminal into an empty cube in a near empty office.
> 
> On Sat, Apr 4, 2020 at 11:17 AM David Arroyo <david at aqwari.net> wrote:
>> Hello,
>> 
>> I'm trying to run Dragonfly 5.8.0 on Hyper-V on my Windows 10 machine. Going off of this article from 2018[1], I created a Gen 1 VM with a legacy network adapter and used IDE for the virtual disk. However, when booting the system I see these errors in dmesg:
>> 
>> ad0: 81920MB <Virtual HD 1.1.0> at ata0-master WDMA2
>> ad0: FAILURE - SETFEATURES ENABLE WCACHE status=51<READY,DSC,ERROR> error=0
>> ad0: TIMEOUT - READ_DMA retrying (1 retry left) LBA=0
>> ad0: FAILURE - SETFEATURES ENABLE WCACHE status=51<READY,DSC,ERROR> error=0
>> ad0: TIMEOUT - READ_DMA retrying (0 retries left) LBA=0
>> ad0: FAILURE - SETFEATURES ENABLE WCACHE status=51<READY,DSC,ERROR> error=0
>> ad0: FAILURE - READ_DMA timed out LBA=0
>> ad0: reading primary partition table: error accessing offset 000000000000 for 512
>> 
>> Trying to read anything from the disk times out. If I switch the mode from WDMA2 to PIO4 I can read but writes give an I/O error:
>> 
>> # natacontrol mode ad0 PIO4
>> current mode = PIO4
>> # dd if=/dev/ad0 of=/dev/null bs=1M count=1
>> 1+0 records in
>> 1+0 records out
>> 1048576 bytes transferred in 0.134417 secs (7800912 bytes/sec)
>> # dd if=/dev/zero of=/dev/ad0 bs=1M count=1
>> ad0: timeout waiting for write DRQ
>> dd: /dev/ad0: Input/output error
>> 1+0 records in
>> 0+0 records out
>> 0 bytes transferred in 0.201104 secs (0 bytes/sec)
>> 
>> I tried turning on debug logging for Hyper-V but nothing was logged while I reproduced the issue. I then tried FreeBSD and Ubuntu VMs with the same configuration and didn't see the issue. I also tried switching the disk from the IDE controller to the SCSI controller, but when I did that, dragonfly couldn't see the disk any longer. 
>> 
>> I'm not sure where to go from here. I work with Linux at $dayjob, so I am not really familiar with Hyper-V *or* BSD. Has anyone else built a dragonfly VM on Hyper-V recently, and did you have any trouble? Does anyone have any advice for troubleshooting the read timeouts?
>> 
>> Cheers,
>> David
>> 
>> [1]: https://www.dragonflydigest.com/2018/09/28/21850.html
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