8c72fcadae
This is not related to the Cinder image cache. In order to speed up the creation of multiple volumes from a single snapshot this change adds a cache of volumes created by merging a snapshots backing chain to the Quobyte driver. This behaviour can be activated via a new config option 'quobyte_volume_from_snapshot_cache'. Instead of merging a snapshots backing chain into a new volume each time a volume is created from this snapshot, the new implementation merges the backing chain into a volume in the new volume cache. New volumes to be created from that snapshot are then copied from the cached volume and no longer require the merging process. Merging happens only for the first time when the cached volume copy is created from a specific snapshot. Subsequent creations of volumes from this snapshot are simply copied from the cache which requires no costly backing chain merge. Partial-Bug: #1715078 Change-Id: I2142b1c0a0cc2c4f85794416e702a326d3406b9d
10 lines
383 B
YAML
10 lines
383 B
YAML
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fixes:
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Added a new optional cache of volumes generated from snapshots for the
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Quobyte backend. Enabling this cache speeds up creation of multiple
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volumes from a single snapshot at the cost of a slight increase in
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creation time for the first volume generated for this given snapshot.
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The ``quobyte_volume_from_snapshot_cache`` option is off by default.
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