managedvolume: add support for local device

[WanzenBug]

"local" connections are used by storage systems that directly set up devices on vdsm nodes, such as linstor1

[aesteve-rh]

Thanks for the contribution!

Could you please briefly describe how did you test the update?

[aesteve-rh]

/ost

[WanzenBug]

Could you please briefly describe how did you test the update?

I used a local oVirt setup (Version 4.5.4), consisting of 4 nodes. I enabled the Managed Block Storage preview, and completed the necessary set up for using linstor, which runs a storage agent on every node. The driver can use either iSCSI transport, or it creates a DRBD device directly on the node, for which it then uses the local connection driver.

Then, after making some changes (the one you see here to vdsm, and some changes to the linstor driver):

• I created a volume
• I attached it to a VM
• I verified (using virsh dumpxml) that the volume attached is actually using the expected device
• Migrated the VM to another host
• Stopped and started the VM
• Created a snapshot

[aesteve-rh]

/ost

[aesteve-rh]

/ost

[aesteve-rh]

Thanks again for contributing :)