f98c9da944
This is part of the effort to improve Cinder's Thin provisioning
support. As some operators have been facing problems to determinte
what is the best value for the max_over_subscription_ratio, we
add in this patch a mechanism to automatically calculate this value.
The formula used for calculation is:
max_over_subscription_ratio = 20 if provisioned_capacity_gb == 0 else:
max_over_subscription_ratio = 1 + (provisioned_capacity_gb/(
total_capacity_gb - free_capacity_gb + 1))
Using this formula, the scheduler will allow the creation of a much
bigger number of volumes at the begginning of the pool's life, and
start to restrict the creation as the free space approaces to 0 or
the reserved limit.
Drivers now can set max_over_subscription_ratio = 'auto' and take
benefit of the change. Drivers that somehow use the
max_over_subscription_ratio inside the driver to do any kind of
calculations are incompatible with this new feature and should
get fixed in order to be able to use the feature.
Implements: bp provisioning-improvements
Change-Id: If30bb6276f58532c0f78ac268544a8804008770e
|
||
|---|---|---|
| .. | ||
| blockstorage-api-throughput.rst | ||
| blockstorage-backup-disks.rst | ||
| blockstorage-boot-from-volume.rst | ||
| blockstorage-consistency-groups.rst | ||
| blockstorage-driver-filter-weighing.rst | ||
| blockstorage-get-capabilities.rst | ||
| blockstorage-groups.rst | ||
| blockstorage-image-volume-cache.rst | ||
| blockstorage-lio-iscsi-support.rst | ||
| blockstorage-manage-volumes.rst | ||
| blockstorage-multi-backend.rst | ||
| blockstorage-nfs-backend.rst | ||
| blockstorage-over-subscription.rst | ||
| blockstorage-ratelimit-volume-copy-bandwidth.rst | ||
| blockstorage-report-backend-state.rst | ||
| blockstorage-troubleshoot.rst | ||
| blockstorage-volume-backed-image.rst | ||
| blockstorage-volume-backups-export-import.rst | ||
| blockstorage-volume-backups.rst | ||
| blockstorage-volume-migration.rst | ||
| blockstorage-volume-multiattach.rst | ||
| blockstorage-volume-number-weigher.rst | ||
| generalized_filters.rst | ||
| index.rst | ||
| README.rst | ||
| ts-cinder-config.rst | ||
| ts-duplicate-3par-host.rst | ||
| ts-eql-volume-size.rst | ||
| ts-failed-attach-vol-after-detach.rst | ||
| ts-failed-attach-vol-no-sysfsutils.rst | ||
| ts-failed-connect-vol-FC-SAN.rst | ||
| ts-HTTP-bad-req-in-cinder-vol-log.rst | ||
| ts-multipath-warn.rst | ||
| ts-no-emulator-x86-64.rst | ||
| ts-non-existent-host.rst | ||
| ts-non-existent-vlun.rst | ||
| ts-vol-attach-miss-sg-scan.rst | ||
Cinder Administration Documentation (source/admin)
Introduction:
This directory is intended to hold any documentation that relates to how to run or operate Cinder. Previously, this content was in the admin-guide section of openstack-manuals.
The full spec for organization of documentation may be seen in the OS Manuals Migration Spec <https://specs.openstack.org/openstack/docs-specs/specs/pike/os-manuals-migration.html>.