Re: [PATCH] Add a kvm subtest -- pci_hotplug, which supports both Windows OS and Linux OS.

[Yaniv Kaul <ykaul@redhat.com>]

On 7/21/2009 9:11 AM, Yolkfull Chow wrote:

<SNIP>
>
>>>
>>>        
>>>>> Previously, I used 'create partition primary' to verify whether the disk could be formatted but always got an error:
>>>>> ---
>>>>> diskpart has encountered an error...
>>>>> ---
>>>>> And then I found the SCSI disk was added to Windows guest was read-only. So I changed the format command to be 'detail disk' temporarily.
>>>>>
>>>>>
>>>>>            
>>>> Interesting - how did that happen? Lets see your command line, and
>>>> probably 'info block' from the monitor. Are you saying that hot-plugged
>>>> drives are added as r/o?
>>>>
>>>>          
>>> I am afraid yes. After pci_add (monitor command: pci_add pci_addr=auto storage
>>> file=/tmp/stg.qcow2,if=scsi) the SCSI block device, 'info block' will
>>> show the scsi0-hd0 device is 'ro=0' whereas when I 'create partition
>>> primary' on this selected disk in diskpart tool, error message will be raised that the disk is
>>> write protected.
>>>
>>>        
>> Well, that doesn't sound like the desired behavior. Work with the KVM
>> developers on this.
>>      
> Hi Yaniv, following is the output from Windows guest:
>
> ---
> Microsoft DiskPart version 6.0.6001
> Copyright (C) 1999-2007 Microsoft Corporation.
> On computer: WIN-Q18A9GP5ECI
>
> Disk 1 is now the selected disk.
>
> DiskPart has encountered an error: The media is write protected.
> See the System Event Log for more information.
>
> Have you ever seen this error during format newly added SCSI block
> device?
>
> The contents of my diskpart script file:
> ---
> select disk 1
>    

online

> create partition primary
> exit
> ---
>
>    
I didn't use a script - nor have I ever hot-plugged a disk, but it does 
seem to happen to me as well now - the 2nd disk (the first is IDE) is 
indeed seems to be R/O.
I'll look into it.


>>      
>>>
>>>        
>>>> Also, you can always add an already formatted drive. Just create a qcow
>>>> drive in another instance, format it properly and use it.
>>>>
>>>>
>>>>          

Any result with an already formatted drive?
Y.