CBT: the thread to centralize your feedback
-
Could you try to migrate with
xeand see if you have the same issue? -
For sure, i ran:
xe vm-migrate uuid=a14f0ad0-854f-b7a8-de5c-88056100b6c6 host-uuid=c354a202-3b30-486b-9645-2fd713dee85fTo move the VM from host 1 to host 2....
Doing it this way i noticed checking the CBT log file does not result in all zeros being output.
[10:00 xcpng-test-01 45e457aa-16f8-41e0-d03d-8201e69638be]# cbt-util get -c -n 087ad136-f31b-4d7c-9271-7c926fd51089.cbtlog fe6e3edd-4d63-4005-b0f3-932f5f34e036For fun i then moved the VM back from Host 2 to host 1 and again, the cbtlog file seems to be intact:
[10:02 xcpng-test-01 45e457aa-16f8-41e0-d03d-8201e69638be]# cbt-util get -c -n 087ad136-f31b-4d7c-9271-7c926fd51089.cbtlog fe6e3edd-4d63-4005-b0f3-932f5f34e036After all this migrating i then ran a job which ran fine and without any errors about not being able to do a delta.
So it seems like it works fine via xe CLI
Update:
After the backup ran properly and generated a new CBT log file i then moved it back and forth between hosts again using the CLI. And the cbtlog file seems to stay in tact again when checking using cbt-util. When i do this with XOA the result from cbtutil is all zeros. -
Okay so back to being an XO issue regarding migration, like if XCP thought it was migrating storage. Ping @julien-f or @MathieuRA
@flakpyro can you provide screenshot on how you migrate with XOA?
-
Here is a screenshot of how i am doing the migration in XOA: moving from host 2 to host 1, leaving the SR drop down empty.
-
And when doing that, you are losing the CBT thing (like it's all 00000), right?
And if you unselect everything but the destination host, is it behaving the same?
-
@olivierlambert
We're making progress i think!Correct letting the migration run with those settings results in 0000 when running the cbt-check command.
I tried removing the migration network and ran a migration with the following settings:
Before migration:
[14:27 xcpng-test-01 45e457aa-16f8-41e0-d03d-8201e69638be]# cbt-util get -c -n 7560326c-8b15-4c58-841f-6a8f962a7d28.cbtlog fe6e3edd-4d63-4005-b0f3-932f5f34e036And after migration:
[14:27 xcpng-test-01 45e457aa-16f8-41e0-d03d-8201e69638be]# cbt-util get -c -n 7560326c-8b15-4c58-841f-6a8f962a7d28.cbtlog fe6e3edd-4d63-4005-b0f3-932f5f34e036If i select a default migration network and run the same migration:
[14:31 xcpng-test-01 45e457aa-16f8-41e0-d03d-8201e69638be]# cbt-util get -c -n 7560326c-8b15-4c58-841f-6a8f962a7d28.cbtlog 00000000-0000-0000-0000-000000000000I think we're getting somewhere now! I have the migration network on both the test and DR pools. This used to be our "Vmotion" network back when we ran vsphere and i decided to continue using it to keep migration traffic on an isolated secure vlan.
In fact these Veeam VMs are not even being used anymore they exist in our test lab as VMs to mess around with for things like this.
-
So selecting the migration network is like triggering something in XO that makes XCP-ng moving the VDI like it was a storage migration (resetting the CBT status).
Ping @MathieuRA and/or @julien-f
-
@olivierlambert Glad we're getting to the bottom of this!
Out of curiosity is having an isolated migration network only available to the XCP-NG hosts considered best practice with XCP-NG? It was with VMware to keep VMotion traffic on its own subnet and since the VLAN was already created on our switches i decided to keep with that setup. Ideally we can get this fixed either way, I'm just curious if I'm doing something considered strange?
-
No it's not strange at all. It's not a bad practice neither
Now, I'd like to check something with
xe: migrate the VM but with the migration network selected. To see if this resets CBT or not. -
@olivierlambert
Im on it! However after searching the XCP-NG docs as well as the XenServer docs i can't see to find how to specify a migration network using xe from the cli. Are you able to provide me the flag i need to use? -
I don't remember the command but @MathieuRA should be able to tell you which call we do to the XAPI when we add a migration network.
