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Merge pull request #43079 from petrutlucian94/hv_addr_doc

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doc/rbd: describe Hyper-V disk addressing limitations

Reviewed-by: Mykola Golub <mgolub@suse.com>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
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Ilya Dryomov 2021-09-09 16:12:15 +02:00 committed by GitHub
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doc/rbd/rbd-windows.rst
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@ -142,11 +142,35 @@ initializes a partition::
Limitations
-----------
CSV support
~~~~~~~~~~~
At the moment, the Microsoft Failover Cluster can't use WNBD disks as
Cluster Shared Volumes (CSVs) underlying storage. The main reason is that
``WNBD`` and ``rbd-wnbd`` don't support the *SCSI Persistent Reservations*
feature yet.
Hyper-V disk addressing
~~~~~~~~~~~~~~~~~~~~~~~
.. warning::
Hyper-V identifies passthrough VM disks by number instead of SCSI ID, although
the disk number can change across host reboots. This means that the VMs can end
up using incorrect disks after rebooting the host, which is an important
security concern. This issue also affects iSCSI and Fibre Channel disks.
There are a few possible ways of avoding this Hyper-V limitation:
* use an NTFS/ReFS partition to store VHDX image files instead of directly
attaching the RBD image. This may slightly impact the IO performance.
* use the Hyper-V ``AutomaticStartAction`` setting to prevent the VMs from
booting with the incorrect disks and have a script that updates VM disks
attachments before powering them back on. The ``ElementName`` field of the
`Msvm_StorageAllocationSettingData`_ `WMI`_ class may be used to label VM
disk attachments.
* use the Openstack Hyper-V driver, which automatically refreshes the VM disk
attachments before powering them back on.
Troubleshooting
===============
@ -156,3 +180,5 @@ Please consult the `Windows troubleshooting`_ page.
.. _installation guide: ../../install/windows-install
.. _RBD basic commands: ../rados-rbd-cmds
.. _WNBD driver: https://github.com/cloudbase/wnbd
.. _Msvm_StorageAllocationSettingData: https://docs.microsoft.com/en-us/windows/win32/hyperv_v2/msvm-storageallocationsettingdata
.. _WMI: https://docs.microsoft.com/en-us/windows/win32/wmisdk/wmi-start-page