October 2017
Intermediate to advanced
340 pages
9h 46m
English
Content preview from Learning Ceph - Second Edition
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Client settings
Ceph's RBD block service is heavily utilized by cloud platforms like OpenStack and other virtualization solutions. Effective caching in memory on the client side can significantly improve the performance that users experience:
[client.yourclientname]rbd_cache = truerbd_cache_size = 67108864rbd_cache_max_dirty = 50331648rbd_cache_target_dirty = 33554432
These values of 64MB, 48MB, and 32MB are double the default numerical values as of Luminous.
Settings must be selected so that
rbd_cache_size > rbd_cache_max_dirty > rbd_cache_target_dirty.
Some references suggest larger values, but consider that these cache buffers are allocated per attached volume. Consider a dense hypervisor node hosting 100 smaller VM instances, each mapping ...
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