24 lines
1.3 KiB
YAML
24 lines
1.3 KiB
YAML
---
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upgrade:
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VMware vmdk driver: The vmware vmdk driver had its get_volume_stats
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removed in a previous release due to a potential performance hit of 20%
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at a high load. The problem with reporting ``unknown`` back to the
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scheduler, is that it effectively removes cinder's ability to properly
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schedule based on capacity utilization. When this driver is enabled in a
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heterogenous environment without properly reporting utilization
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statistics, the scheduler's capacity filter will always allow this driver
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to service a provisioning request. Without reporting the backend stats,
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the capacity filter also can't determine the reserved_percentage as well
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as the max_over_subscription_ratio. To enable the collection of stats
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set ``vmware_enable_volume_stats`` to True in the driver section of
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cinder.conf. The default setting is False. Keep in mind that there may
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be a degradation in performance on the vcenter when enabling this setting.
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fixes:
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VMware vmdk driver: The collection of volume stats, which had been
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disabled, may now be turned on by using the ``vmware_enable_volume_stats``
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configuration option. The default for this option is False (no
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stats collection). Be aware that enabling volume stats may cause
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performance issues under high load.
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