SR_BACKEND_FAILURE_140

jasonnix

Hello,
I upgraded XO to the latest version. I want to create a VM and the operating system ISO file is on another server. I had previously mounted it via SMB:

SMB ISO.png

I created a new virtual machine and when I try to run it I get the following error message:

SR_BACKEND_FAILURE_140(, Incorrect DNS name, unable to resolve., )

Even when I try to delete this SMB ISO I get the same error message. What is wrong?

Thank you.

olivierlambert

Hi,

You are using a name for the SMB server that can't be resolved by your DNS.

jasonnix

Hi @olivierlambert,
The ISO file is located on a Windows server. I can see that file via other computers in the network. From the XCP-ng host, I can ping that server.

olivierlambert

Ping with the host name? Please share us the PBD

jasonnix

@olivierlambert, Yes:

# ping ISOREPO
PING ISOREPO.Mydoamin.com (172.20.1.18) 56(84) bytes of data.
64 bytes from ISOREPO.Mydoamin.com (172.20.1.18): icmp_seq=1 ttl=128 time=1.44 ms
64 bytes from ISOREPO.Mydoamin.com (172.20.1.18): icmp_seq=2 ttl=128 time=0.350 ms
64 bytes from ISOREPO.Mydoamin.com (172.20.1.18): icmp_seq=3 ttl=128 time=0.426 ms
64 bytes from ISOREPO.Mydoamin.com (172.20.1.18): icmp_seq=4 ttl=128 time=0.373 ms
^C
--- ISOREPO.Mydoamin.com ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3004ms
rtt min/avg/max/mdev = 0.350/0.648/1.444/0.460 ms

About the PBD:

# xe sr-list
uuid ( RO)                : f6852f22-2099-a9b6-1731-95807eaa95c6
          name-label ( RW): DVD drives
    name-description ( RW): Physical DVD drives
                host ( RO): xcp-ng
                type ( RO): udev
        content-type ( RO): iso


uuid ( RO)                : 4b89fe07-7859-ddee-fb5f-77d3f45b0753
          name-label ( RW): SMB ISO library
    name-description ( RW): SMB ISO Library [\\ISOREPO\ISO\OS\]
                host ( RO): xcp-ng
                type ( RO): iso
        content-type ( RO): iso


uuid ( RO)                : 00f82a18-a9f6-f7bc-9ca1-f42698d46b5f
          name-label ( RW): Local storage
    name-description ( RW): 
                host ( RO): xcp-ng
                type ( RO): lvm
        content-type ( RO): user


uuid ( RO)                : 71424c21-0260-af80-b394-200e49ec767a
          name-label ( RW): XCP-ng Tools
    name-description ( RW): XCP-ng Tools ISOs
                host ( RO): xcp-ng
                type ( RO): iso
        content-type ( RO): iso


uuid ( RO)                : daf51f1b-bb25-4a58-3358-f3f5671a2771
          name-label ( RW): Removable storage
    name-description ( RW): 
                host ( RO): xcp-ng
                type ( RO): udev
        content-type ( RO): disk


uuid ( RO)                : c5129868-a590-68ca-e587-db708ad61f38
          name-label ( RW): Hardware HBA virtual disk storage
    name-description ( RW): Hardware HBA SR [HP - 500143801914D7C0]
                host ( RO): xcp-ng
                type ( RO): lvmohba
        content-type ( RO):

olivierlambert

I think it would be better to use the FQDN in the ISO SR.

jasonnix

@olivierlambert Thanks, but the problem is that I get the same error for forgetting ISO SR.

olivierlambert

Is it mounted or not at all? (check the /run/sr-mount folder)

jasonnix

@olivierlambert:

# xe sr-forget uuid=4b89fe07-7859-ddee-fb5f-77d3f45b0753
The SR is still connected to a host via a PBD. It cannot be destroyed or forgotten.
sr: 4b89fe07-7859-ddee-fb5f-77d3f45b0753 (SMB ISO library)

Where is xe pbd-unplug uuid=<UUID of PBD> command?

olivierlambert

What do you mean "where"? That's exactly the right command

jasonnix

@olivierlambert :

# xe pdb-unplug
Unknown command: pdb-unplug
For usage run: 'xe help'

BenjiReis

@jasonnix there's a typo you use pdb instead of pbd

jasonnix

Hi @BenjiReis,
Yes. Problem solved by adding the following lines to the resolv.conf file:

domain Mydoamin.com
search Mydoamin.com