ATA controller and Hyper-V "synthetic storage driver" handle the IDE disks devices ( but not for the CD-ROM) Re: Hyper-V on FreeBSD

[Victor Miasnikov]

Hi!


> On 07.05.2013 10:40, Victor Miasnikov wrote:
>>> prevent default OS driver from attaching to emulated ATA controller
>>> when Hyper-V
>>
>> Disable both primary and secondary ATA controller prevent use CD-ROM
>> device in VM ( guest)
>>
>> Because "synthetic storage driver" not handle CD-ROM devices
>> ( IMHO, even more: Hyper-V host work with CD-ROM only as "PCI bus" device)
>
A.M.> Then may be possibility of blocking/hiding specific ATA channels or
A.M.> devices could be investigated.

 IMHO, this ( or some like this) must be investigated
In any case, need carefully testing work CD-ROM ( primary for LiveCD and (or) .ISO for setup FreeBSD) in Hyper-V 
enviroment


>> http://lists.freebsd.org/pipermail/freebsd-virtualization/2013-April/001180.html
>>
>> ==
>> . . .
>> On 23.04.2013 17:07, Larry Melia wrote:
>> . . .
L.M.>>> Removing our ATA patches, on the other hand, results in a huge
L.M.>>> performance loss. This is because the root file system is managed by the
L.M.>>> ATA driver, which is emulated under Hyper-V.
>> ==
VVM>>
VVM>> Place on IDE disk only "\boot" ( and bootloader), other on SCSI .
VVM>>
A.M.>
A.M.> May be instead of splitting filesystem it could be better to boot from
A.M.> "SCSI" completely and forget about "ATA"?
A.M.> Or there is no option ROM for SCSI boot in Hyper-V?
A.M.>

 Yes, boot from SCSI disk in Hyper-V VM ( "guest") is impossible


Best regards, Victor Miasnikov
Blog:  http://vvm.blog.tut.by/