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

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Kevin Wolf wrote:
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/...
applied your patch, the actual error is (e.g.):
qemu: could not open disk image /dev/mapper/iqn.2001-05.com.equallogic:0-8a0906-e1861b105-4cb000e7e8c4bf3b-opensuse-11-2-i586: No such file or directory

while the image is there:

root@TEST:/home/kvm/src# ls -la /dev/mapper/iqn.2001-05.com.equallogic\:0-8a0906-e1861b105-4cb000e7e8c4bf3b-opensuse-11-2-i586 brw-rw---- 1 root disk 254, 0 2010-06-01 13:48 /dev/mapper/iqn.2001-05.com.equallogic:0-8a0906-e1861b105-4cb000e7e8c4bf3b-opensuse-11-2-i586

peter
Kevin



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