Reviewed: https://review.opendev.org/c/openstack/glance/+/927844
Committed:
https://opendev.org/openstack/glance/commit/39e407e9ffe956d40a261905ab98c13b5455e27d
Submitter: "Zuul (22348)"
Branch: master
commit 39e407e9ffe956d40a261905ab98c13b5455e27d
Author: Cyril Roelandt <cy...@redhat.com>
Date: Tue Sep 3 17:25:54 2024 +0200
Documentation: fix default value for rbd_store_chunk_size
Closes-Bug: #2078476
Change-Id: I3b83e57eebf306c4de28fd58589522970e62cf42
** Changed in: glance
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/2078476
Title:
rbd_store_chunk_size defaults to 8M not 4M
Status in Glance:
Fix Released
Bug description:
Versions affected: from current master to at least Antelope.
The documentation
(https://docs.openstack.org/glance/2024.1/configuration/configuring.html#configuring-
the-rbd-storage-backend) states that the default rbd_store_chunk_size
defaults to 4M while in reality it's 8M. This could have been 'only' a
documentation bug, but there are two concerns here:
1) Was it the original intention to have 8M chunk size (which is
different from Ceph's defaults = 4M) or was it an inadvertent effect
of other changes?
2) Cinder defaults to rbd_store_chunk_size=4M. Having volumes created
from Glance images results in an inherited chunk size of 8M (due to
snapshotting) and could have unpredicted performance consequences. It
feels like this scenario should at least be documented, if not
avoided.
Steps to reproduce:
- deploy Glance with RBD backend enabled and default config;
- query stores information for the configured chunk size
(/v2/info/stores/detail)
Optional:
- have an image created in Ceph pool and validate its chunk size with rbd
info command.
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