flyinweb's blog

As my last post, I had built a more healthy load balancer. But it is still not practical. Because if the linux director fails, the system will not work. The high availability should be considered. In this post, I list my steps to implement HA function.

Using ctags and Vim is a lethal combination, especially when doing bigger projects.

Using them gives you the following features:

• Impressive class/function/method search
• Ability to go to the definition of a function with one click (even in dynamic languages like Python)
• Better overview by a module browser (where you can see classes and members)

获取XML标签内容：

Service Pack 2 for Windows Server 2003 ("W2K3" in this post) includes Windows Deployment Services ("WDS"). WDS replaces Remote Installation Services (“RIS”) on W2K3 SP1 and Windows 2000 servers. Upgrading from RIS to WDS is NOT covered here (see: Windows Deployment Services Update Step-by-Step Guide for Windows Server 2003 on TechNet Below is how to set up WDS from scratch, when RIS was not used previously. In other words, WDS in Mixed Mode on a 2003 SP2 server can:

1) install Legacy operating systems (Windows 2003, XP, and 2000) without an existing RIS infrastructure

2) use the WDS management tools, and

3) install Windows Vista and Windows 2008 server from the same 2003 server.

Introduction

Openfiler is a high performance operating system tailored for use as a SAN/NAS appliance. This configuration will enable two Openfiler appliances to work in an Active/Passive high availability scenario. 

对RAID进行操作很可能会导致数据丢失，请在操作之前务必将重要数据妥善备份，以防万一。

名称解释：
Disk Group：磁盘组，这里相当于是阵列，例如配置了一个RAID5，就是一个磁盘组
VD(Virtual Disk)： 虚拟磁盘，虚拟磁盘可以不使用阵列的全部容量，也就是说一个磁盘组可以分为多个VD
PD(Physical Disk)： 物理磁盘
HS：Hot Spare 热备
Mgmt：管理

DRBD是一种块设备的实现，与heartbeat的搭配，被广泛用于linux下的高可用（HA）方案中，本文是介绍如何在已经含有数据的分区或硬盘上搭建drbd和heartbeat高可用的mysql服务。