Re: [Qemu-devel] Latest GIT doesn't work with long device names

[Kevin Wolf]

Am 01.06.2010 12:59, schrieb Peter Lieven:
> Hi,
> 
> I just compiled latest git to work on Bug #585113 .
> 
> Unfortunately, I can't start the the VMs with the device mappings 
> generated by our multipath
> setup.
> 
> cmdline:
> /usr/bin/qemu-kvm-devel  -net none  -drive 
> file=/dev/mapper/iqn.2001-05.com.equallogic:0-8a0906-88961b105-19f000e7e7d4beaa-test1,if=scsi,boot=on,cache=none,aio=native
>   
> -drive 
> file=/dev/mapper/iqn.2001-05.com.equallogic:0-8a0906-89661b105-458000e7e804beaa-test2,if=scsi,boot=off,cache=none,aio=native
>   
> -drive 
> file=/dev/mapper/iqn.2001-05.com.equallogic:0-8a0906-8a361b105-928000e7e834beaa-test3,if=scsi,boot=off,cache=none,aio=native
>   
> -drive 
> file=/dev/mapper/iqn.2001-05.com.equallogic:0-8a0906-8af61b105-d10000e7e864beaa-test4,if=scsi,boot=off,cache=none,aio=native
>   
> -m 1024 -cpu qemu64,model_id='Intel(R) Xeon(R) CPU           E5520  @ 
> 2.27GHz'  -monitor tcp:0:4005,server,nowait -vnc :5 -name 'ide-test'  
> -boot order=dc,menu=on  -cdrom 
> /home/kvm/cdrom//root/KNOPPIX_V6.2.1CD-2010-01-31-DE.iso -k de  -pidfile 
> /var/run/qemu/vm-153.pid  -mem-path /hugepages -mem-prealloc  -rtc 
> base=utc,clock=host -usb -usbdevice tablet
> 
> error:
> qemu: could not open disk image 
> /dev/mapper/iqn.2001-05.com.equallogic:0-8a0906-88961b105-19f000e7e7d4beaa-test1:
>  
> Argument list too long

Might be a problem with the colon in your file name (the error message
is nonsense - I'll send a patch). It takes everything before the first
colon as a protocol name. To work around this you can specify the
protocol explicitly, as in -drive file=host_device:/dev/mapper/...

Kevin