mirror of https://github.com/ceph/ceph-ansible.git
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BlueStore's cache is sized conservatively by default, so that it does not overwhelm under-provisioned servers. The default is 1G for HDD, and 3G for SSD. To replace the page cache, as much memory as possible should be given to BlueStore. This is required for good performance. Since ceph-ansible knows how much memory a host has, it can set `bluestore cache size = max(total host memory / num OSDs on this host * safety factor, 1G)` Due to fragmentation and other memory use not included in bluestore's cache, a safety factor of 0.5 for dedicated nodes and 0.2 for hyperconverged nodes is recommended. Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1595003 Signed-off-by: Neha Ojha <nojha@redhat.com> Co-Authored-by: Guillaume Abrioux <gabrioux@redhat.com> |
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