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Internal error: another frontend device is already connected to this domain

You have just created a VM from a CentOS image, and trying to start new vm from it, And you are getting the error message as “Internal error: another frontend device is already connected to this domain (frontend (domid=0 | kind=vbd | devid=51712); back-end (domid=0 | kind=vbd | devid=51712))” on xenserver Then this tutorial will help you to fix the issue. This issue generally occurs if dom0 cannot map the vbd because The block device is still mapped to dom0 and it’s belong to a Virtual Machine that was already running on another host within the pool and the xenstore entry on this host must have been a fragment, due to this vm does not boot any more.

To resolve the issue we need to remove an old blocking entry from xenstore by using following command.

root@linuxpcfix [~]#xenstore-ls

or

root@linuxpcfix [~]#xenstore-ls | grep -n 51712 | grep frontend
output will some thing like as below.
local = “”
domain = “”
0 = “”
device = “”
suspend = “”
event-channel = “38”
vbd = “”
51712 = “”
backend = “/local/domain/0/backend/vbd/0/51712”
protocol = “x86_32-abi”
state = “4”
backend-id = “0”
device-type = “disk”
virtual-device = “51712”
ring-ref = “8”
event-channel = “64”
name = “Domain-0”
domid = “0”
vm = “/vm/ec52d34a-b3a9-4dbb-8006-f6ddc94f57a4”

Selection_001
Then you need to execute the following command.

root@linuxpcfix [~]#xenstore-rm -t /local/domain/0/device/vbd/51712

That’s this tutorial will help you to short-out your problem on xen server.

Note :: There are might be many possible causes for this errors, such as ranging from udev issues to Xen losing communication to the master and host references being left behind. But my issue had resolved by using above steps.

About

I am founder and webmaster of www.linuxpcfix.com and working as a Sr. Linux Administrator (Expertise on Linux/Unix & Cloud Server) and have been in the industry from last 7 years.

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