ceph配置参数如何优化

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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 -l759

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 = 204800filestore_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 = 500000000filestore_wbthrottle_xfs_indoes_start_flusher = 500filestore_wbthrottle_xfs_indoes_hard_limit = 500000filestore_wbthrottle_xfs_ios_start_flusher = 50000filestore_wbthrottle_xfs_bytes_hard_limit = 500000000filestore_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 = 5000filestore_queue_max_bytes = 1024000000filestore_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 = 500000journal_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 = 4osd disk threads = 2filestore op threads = 4

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