数据库设计思路是尽量做垂直分区，没有 Sharding。不过在反范式(denormalized)方面做得比较彻底，不用表连接(JOIN)方法者复杂的查询。

M. Tim Jones is an embedded firmware architect and the author of Artificial Intelligence: A Systems Approach, GNU/Linux Application Programming (now in its second edition), AI Application Programming (in its second edition), and BSD Sockets Programming from a Multilanguage Perspective. His engineering background ranges from the development of kernels for geosynchronous spacecraft to embedded systems architecture and networking protocols development. Tim is a Consultant Engineer for Emulex Corp. in Longmont, Colorado.

http://ceph.newdream.net/2010/04/v0-20-released/

使用 qemu 建立简单的 ceph 分布式文件系统测试环境

1. 下载代码并编译git clone git://ceph.newdream.net/git/ceph.gitgit clone git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client.git

 

2. 配置服务端环境并启动服务2.1 添加 use_xattr在/etc/fstab中，找到服务端所在文件系统的位置，添加 use_xattr选项。比如UUID=c0fb46f4-6b8d-41a3-b026-5850b9f51865 /               ext3relatime,user_xattr,errors=remount-ro 0       1重启系统

2.2 建立文件夹mkdir -p dev/osd0mkdir outmkdir log

2.3 启动 ceph服务,  ip地址可以根据自己的环境选择./vstart.sh -n -d -m 192.168.0.100

3. 测试服务端配置./csyn --syn makedirs 2 2 2./csyn --syn walk执行后，应该可以看到很多文件夹和文件

4. 编译 linux客户端4.1 配置make menuconfig , 在文件系统中选择 ceph

5. 启动 qemu 加载 ceph文件系统mount -t ceph 192.168.0.100:/ /mnt/cephtouch abc

6. 验证./csyn --syn walk应该可以看到刚刚建立的文件 abc

http://www.docin.com/p-44802740.html