ceph recommendation - os

内核版本 : 

v3.16.3 or later (rbd deadlock regression in v3.16.[0-2])

v3.14.*

v3.10.*

注意, 如果要使用firefly 的 crush tunables功能, 建议使用v3.16.3内核.

firefly (CRUSH_TUNABLES3) tunables are supported starting with v3.15. See CRUSH Tunables for more details.

如果要使用 btrfs 文件系统 , 建议使用v3.16.3内核.

GLIBC : 

firefly以后的版本(例如giant+), 建议使用fdatasync flush方法提升性能. 

• fdatasync(2): With Firefly v0.80 and beyond, use fdatasync(2) instead of fsync(2) to improve performance.
• syncfs(2): For non-btrfs filesystems such as XFS and ext4 where more than one ceph-osd daemon is used on a single server, Ceph performs significantly better with the syncfs(2) system call (added in kernel 2.6.39 and glibc 2.14). 
• New versions of Ceph (v0.55 and later) do not depend on glibc support. 

操作系统

以Firefly版本为例, 建议使用ubuntu 14.04或CentOS 7, RHEL 7.

FIREFLY (0.80)

NOTES

• 1: The default kernel has an older version of btrfs that we do not recommend for ceph-osd storage nodes. Upgrade to a recommended kernel or use XFS or ext4.
• 2: The default kernel has an old Ceph client that we do not recommend for kernel client (kernel RBD or the Ceph file system). Upgrade to a recommended kernel.
• 3: The default kernel or installed version of glibc does not support the syncfs(2) system call. Putting multiple ceph-osd daemons using XFS orext4 on the same host will not perform as well as they could.

测试数据

TESTING

• B: We continuously build all branches on this platform and exercise basic unit tests. We build release packages for this platform.
• I: We do basic installation and functionality tests of releases on this platform.
• C: We run a comprehensive functional, regression, and stress test suite on this platform on a continuous basis. This includes development branches, pre-release, and released code.

[参考]

1. http://ceph.com/docs/master/start/os-recommendations/