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When detaching multiple NVMe-oF volumes from the same host we may end with a NVMe subsystem in "connecting" state, and we'll see a bunch nvme error in dmesg. This happens on storage systems that share the same subsystem for multiple volumes because Nova has not been updated to support the tri-state "shared_targets" option that groups the detach and unmap of volumes to prevent race conditions. This is related to the issue mentioned in an os-brick commit message [1] For the guard_connection method of os-brick to work as expected for NVMe-oF volumes we need to use microversion 3.69 when retrieving the cinder volume. In microversion 3.69 we started reporting 3 states for shared_targets: True, False, and None. - True is to guard iSCSI volumes and will only be used if the iSCSI initiator running on the host doesn't have the manual scans feature. - False is that no target/subsystem is being shared so no guard is necessary. - None is to force guarding, and it's currenly used for NVMe-oF volumes when sharing the subsystem. [1]: https://review.opendev.org/c/openstack/os-brick/+/836062/12//COMMIT_MSG Closes-Bug: #2035375 Change-Id: I4def1c0f20118d0b8eb7d3bbb09af2948ffd70e1
OpenStack Nova
OpenStack Nova provides a cloud computing fabric controller, supporting a wide variety of compute technologies, including: libvirt (KVM, Xen, LXC and more), Hyper-V, VMware and OpenStack Ironic.
Use the following resources to learn more.
API
To learn how to use Nova's API, consult the documentation available online at:
For more information on OpenStack APIs, SDKs and CLIs in general, refer to:
Operators
To learn how to deploy and configure OpenStack Nova, consult the documentation available online at:
In the unfortunate event that bugs are discovered, they should be reported to the appropriate bug tracker. If you obtained the software from a 3rd party operating system vendor, it is often wise to use their own bug tracker for reporting problems. In all other cases use the master OpenStack bug tracker, available at:
Developers
For information on how to contribute to Nova, please see the contents of the CONTRIBUTING.rst.
Any new code must follow the development guidelines detailed in the HACKING.rst file, and pass all unit tests.
Further developer focused documentation is available at:
Other Information
During each Summit and Project Team Gathering, we agree on what the whole community wants to focus on for the upcoming release. The plans for nova can be found at: