Xen Block Devices Usage tap2:aio

Posted by valqk on
In case of getting max loop devices reached and have already built image of VM and you CAN't restart machine to increase max_loop=XX when loading loop module,
use tap:aio.



#> apt-get install blktap-dkms blktap-utils

#> modprobe blktap

Then change the config of vm from file:/ to tap2:tapdisk:aio:/
Something like this:


bootloader = '/usr/lib/xen-4.1/bin/pygrub'

vcpus       = '1'

memory      = '512'

root        = '/dev/xvda2 ro'

disk        = [

                  'tap2:tapdisk:aio:/home/xen//domains/virtual.com/disk.img,xvda2,w',

                  'tap2:tapdisk:aio:/home/xen/domains/virtual.com/swap.img,xvda1,w',

              ]

name        = 'virtual.com'

vif         = [ 'ip=192.168.10.100 ,mac=01:06:1A:12:FE:C5' ]

on_poweroff = 'destroy'

on_reboot   = 'restart'

on_crash    = 'restart'