Oracle VM: DevController - Still Waiting to Write Device Entries (Doc ID 2785638.1)

Last updated on JULY 05, 2021

Applies to:

Symptoms

Each Virtual Machine takes a long time to start.
The following messages can be observed in xend.log:

[2000-01-01 00:00:54 2349] DEBUG (DevController:97) DevController: writing {'domain': '0004fb00000600000d632c1a410d7db6', 'discard-enable': '0', 'uuid': 'f5bf1a74-c2f0-12ad-2149-5b1b4fee8347', 'bootable': '0', 'dev':'xvdap', 'state': '1', 'params':'/dev/mapper/360000970000196702075533030394346', 'mode': 'w', 'online': '1','frontend-id': '36', 'type': 'phy', 'frontend':'/local/domain/36/device/vbd/268445952'} to /local/domain/0/backend/vbd/36/268445952.
[2000-01-01 00:01:08 2349] DEBUG (DevController:100) DevController: still waiting to write device entries.
[2000-01-01 00:01:21 2349] DEBUG (DevController:100) DevController: still waiting to write device entries.
[2000-01-01 00:01:33 2349] DEBUG (DevController:100) DevController: still waiting to write device entries.
[2000-01-01 00:01:45 2349] DEBUG (DevController:100) DevController: still waiting to write device entries.
[2000-01-01 00:01:57 2349] DEBUG (DevController:100) DevController: still waiting to write device entries.
[2000-01-01 00:02:09 2349] DEBUG (DevController:100) DevController: still waiting to write device entries.

In the example above, it took ~1 minute to write 1 single device in the xenstore.
In a VM with 20 devices, the Virtual Machine can take 20 minutes to start.

Cause

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