这篇文章将为大家详细讲解有关ceph配置参数如何优化，小编觉得挺实用的，因此分享给大家做个参考，希望大家阅读完这篇文章后可以有所收获。
ceph的配置文件/etc/ceph.conf中可配置参数很多，可以通过以下命令查看：
root@osd2:/var/run/ceph# ceph --admin-daemon ceph-mon.osd2.asok config show|wc -l
759
一直想对一些参数进行修改以达到优化性能的目的。以前一篇文章和其它一些资料为基础，总结一下可优化的配置。
1. keep FD
filestore_fd_cache_size = 204800
filestore_omap_header_cache_size = 204800
2. sparse read/write
filestore_fiemap = true
3. drop default limits
#默认值
"filestore_wbthrottle_xfs_bytes_start_flusher": "41943040",
"filestore_wbthrottle_xfs_bytes_hard_limit": "419430400",
"filestore_wbthrottle_xfs_ios_start_flusher": "500",
"filestore_wbthrottle_xfs_ios_hard_limit": "5000",
"filestore_wbthrottle_xfs_inodes_start_flusher": "500",
"filestore_wbthrottle_xfs_inodes_hard_limit": "5000",
#修正值
filestore_wbthrottle_xfs_bytes_start_flusher = 500000000
filestore_wbthrottle_xfs_indoes_start_flusher = 500
filestore_wbthrottle_xfs_indoes_hard_limit = 500000
filestore_wbthrottle_xfs_ios_start_flusher = 50000
filestore_wbthrottle_xfs_bytes_hard_limit = 500000000
filestore_wbthrottle_xfs_ios_hard_limit = 500000
#默认值
"filestore_queue_max_ops": "50",
"filestore_queue_max_bytes": "104857600",
"filestore_queue_committing_max_ops": "500",
"filestore_queue_committing_max_bytes": "104857600",
#修正值
filestore_queue_max_ops = 5000
filestore_queue_max_bytes = 1024000000
filestore_queue_committing_max_ops = 50000
#默认值
"journal_queue_max_ops": "300",
"journal_queue_max_bytes": "33554432",
#修正值
journal_queue_max_ops = 500000
journal_queue_max_bytes = 10240000000
4. use rbd cache
rbd cache = true
5. speed cache
filestore_fd_cache_random = true
6. async messenger
ms_type = async(no)
ms_async_op_threads = 5(no)
ms_dispatch_throttle_bytes = 104857600000
7. op thread
osd op threads = 4
osd disk threads = 2
filestore op threads = 4
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