tripleo-image-elements/releasenotes/notes/thin-provisioning-74121cc4c...

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The seven LVM volumes in the overcloud-hardened-uefi-full image are now
thinly provisioned, backed by a single pool. The initial boot growvols
behaviour is now to grow the pool to the size of the disk and grow each
thin provisioned volume so the capacity of the pool is filled but not over
provisioned. This will allow temporary volumes to be created for backups
during upgrades, and it will allow the operator to over-provision a volume
which requires extra capacity.