[Qemu-devel] about -drive argument

[Qemu-devel] about -drive argument

[nicolas prochazka]

Hi,
I'm doing some tests with -drive option, and it seems there's some issue :

-drive xxx ,snapshot=off|on   does not ok
=> if i create two drive  -drive file=/mnt/vdisk/test1.qcow2
if=scsi,bus=0,unit=6,boot=on,cache=off,snapshot=on -drive
file=/mnt/vdisk/test2.qcow2
if=scsi,bus=0,unit=2,cache=off,snapshot=off
it does not run, test1.qcow2 and test2.qcow2   seems to be in the same
mode ( no snapshot)
Only -snapshot in qemu command seems to be ok.


an other issue:
 -drive file=/mnt/vdisk/test1.qcow2 if=scsi,bus=0,unit=6,boot=on,cache=off : ok
 -drive file=/mnt/vdisk/test1.qcow2,if=scsi,bus=0,unit=6,boot=on,cache=off
: not ok    image not found  ( there's a , after file image file, as
mentionned in doc


Regards,
Nicolas Prochazka.

Re: [Qemu-devel] about -drive argument

[Laurent Vivier]

Le mercredi 28 mai 2008 à 10:49 +0200, nicolas prochazka a écrit :
> Hi,
> I'm doing some tests with -drive option, and it seems there's some issue :
> 
> -drive xxx ,snapshot=off|on   does not ok
> => if i create two drive  -drive file=/mnt/vdisk/test1.qcow2
> if=scsi,bus=0,unit=6,boot=on,cache=off,snapshot=on -drive
> file=/mnt/vdisk/test2.qcow2
> if=scsi,bus=0,unit=2,cache=off,snapshot=off
> it does not run, test1.qcow2 and test2.qcow2   seems to be in the same
> mode ( no snapshot)
> Only -snapshot in qemu command seems to be ok.

The valid syntax is with a comma:

-drive file=/mnt/vdisk/test1.qcow2,if=scsi,bus=0,unit=6,boot=on,cache=off,snapshot=on

but cache=off and snapshot=on are only compatible since the commit 4599.

> 
> an other issue:
>  -drive file=/mnt/vdisk/test1.qcow2 if=scsi,bus=0,unit=6,boot=on,cache=off : ok
>  -drive file=/mnt/vdisk/test1.qcow2,if=scsi,bus=0,unit=6,boot=on,cache=off
> : not ok    image not found  ( there's a , after file image file, as
> mentionned in doc

And what is the result of "ls -l /mnt/vdisk/test1.qcow2" ?

Laurent 
-- 
------------- Laurent.Vivier@bull.net ---------------
"The best way to predict the future is to invent it."
- Alan Kay

Re: [Qemu-devel] about -drive argument

[Kevin Wolf]

Laurent Vivier schrieb:
>> an other issue:
>>  -drive file=/mnt/vdisk/test1.qcow2 if=scsi,bus=0,unit=6,boot=on,cache=off : ok
>>  -drive file=/mnt/vdisk/test1.qcow2,if=scsi,bus=0,unit=6,boot=on,cache=off
>> : not ok    image not found  ( there's a , after file image file, as
>> mentionned in doc

The first list only seems to work ok because qemu silently ignores 
everything after the space, especially the cache=off which won't work 
with qow2 before Rev 4599. That's probably not what you wanted. You 
really need the comma.

The wrong syntax also explains why you always get the default for the 
snapshot option.

> And what is the result of "ls -l /mnt/vdisk/test1.qcow2" ?

Actually, "qemu: could not open disk image xyz" is the expected 
behaviour before Rev 4599.

Kevin