doc: add another up-call caveat for cells v2 for xenapi aggregates
There is an up-call from the xenapi driver when performing a live migration and --block-migrate is not specified such that the driver checks to see if the source and destination hosts are in the same aggregate. This fails in a super-conductor setup because the aggregates are now in the API database and the cell conductor won't be able to access that database by design. Change-Id: I6c880c72d87eb0116cb57371e5d600dced2915f7 Related-Bug: #1709594
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@ -316,9 +316,10 @@ implement some features without such connectivity. Thus, anything that
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requires a so-called "upcall" will not function. This impacts the
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following:
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- Instance reschedules during boot
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- Instance affinity reporting from the compute nodes to scheduler
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- The late anti-affinity check
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#. Instance reschedules during boot
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#. Instance affinity reporting from the compute nodes to scheduler
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#. The late anti-affinity check
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#. Querying host aggregates from the cell
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The first is simple: if you boot an instance, it gets scheduled to a
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compute node, fails, it would normally be re-scheduled to another
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@ -336,3 +337,10 @@ affect you. To make sure you don't make futile attempts at the
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affinity check, you should set
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``[workarounds]/disable_group_policy_check_upcall=True`` and
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``[filter_scheduler]/track_instance_changes=False`` in ``nova.conf``.
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The fourth is currently only a problem when performing live migrations
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using the XenAPI driver and not specifying ``--block-migrate``. The
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driver will attempt to figure out if block migration should be performed
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based on source and destination hosts being in the same aggregate. Since
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aggregates data has migrated to the API database, the cell conductor will
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not be able to access the aggregate information and will fail.
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