DB2 pureScale 是同时兼备高扩展性和高可用性的数据库集群。在 db2 pureScale 集群里包含了 RSCT,TSA,GPFS 等单独的软件产品。这些产品都包含在 DB2 的安装介质里面。如果要为 DB2 pureScale 升级补丁包,需要按照一定的流程,升级 RSCT,TSA,GPFS 和 DB2
DB2 pureScale 集群是一种兼备高扩展性和高可用性的集群解决方案。这个解决方案整合了包括软硬件在内的多个产品。DB2 pureScale 集群采用的是共享存储的集群架构。
图 1. DB2 pureScale 集群的架构
这张图描述了 DB2 pureScale 的集群架构。DB2 pureScale 可以由多个主机(节点)组成,彼此通过 IB 网络和以太网通信,每个节点都连接到共享存储。集群内部通过自动负载均衡的功能调度各个节点的资源。从客户端来看,DB2 pureScale 就是一个数据库环境,不需要关心去连哪个节点以及集群是如何组成。DB2 pureScale 集群的关键技术就是借鉴的 IBM 大型机中成熟的全局锁定和内存管理技术。
在这个集群解决方案里面,软件产品包括管理共享存储的 GPFS 产品,整合所有资源的 TSA 产品,DB2 产品等。这些组件都包含在整套 DB2 产品的安装介质里面。DB2 pureScale 发布的新的补丁包就可能包含这三大产品的更新。所以在升级 DB2 pureScale 补丁包的时候尤其要注意检查这些产品是否需要升级,以及如何做到安全升级。
升级补丁包前的准备工作
在升级补丁包之前,需要确认 GPFS 和 TSA 是否需要升级,还需要完全停止 DB2 pureScale 数据库集群。在升级的过程中,要保证 DB2 pureScale 数据库不会被重启。
检查 TSA 版本
首先来查看新的补丁包中的 TSA 版本是否高于已安装的版本。查看工具已经包含在新的补丁包中。本案例中补丁包 DVD 被解压在 /home/temp/DB2v9.8/v9.8fp5 下面。
清单 1. TSA 已安装版本
# /home/temp/DB2v9.8/v9.8fp5/server/db2/aix/tsamp/db2cktsa -v install 3.2.6.2
清单 2. TSA 目标版本
# /home/temp/DB2v9.8/v9.8fp5/server/db2/aix/tsamp/db2cktsa -v media 3.2.7.1
在这个案例里面,TSA 的目标版本是 3.2.7.1,高于已安装版本 3.2.6.2,所以需要多 TSA 集群进行升级。
检查 GPFS 版本
检查 GPFS 版本的方式和检查 TSA 差不多,工具也包含在新的补丁包中。
清单 3. GPFS 已安装版本
# /home/temp/DB2v9.8/v9.8fp5/server/db2/aix/gpfs/db2ckgpfs -v install 3.3.0.14
清单 4. GPFS 目标版本
# /home/temp/DB2v9.8/v9.8fp5/server/db2/aix/gpfs/db2ckgpfs -v media 3.4.0.13
清单中列举的 GPFS 已安装版本 3.3.0.14 是低于目标版本 3.4.0.13 的,所以也需要升级 GPFS 集群软件和环境。

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