rac 11g 安装错误“Timed outwaiting for the CRS stack to start”的解决
最近在安装oracle 11gR2的时候，在第一个节点执行root.sh成功，而在第二个节点执行root.sh的时候发生错误：
CRS-2672: Attempting to start 'ora.mdnsd' on 'rhel2'
CRS-2676: Start of 'ora.mdnsd' on 'rhel2' succeeded
CRS-2672: Attempting to start 'ora.gipcd' on 'rhel2'
CRS-2676: Start of 'ora.gipcd' on 'rhel2' succeeded
CRS-2672: Attempting to start 'ora.gpnpd' on 'rhel2'
CRS-2676: Start of 'ora.gpnpd' on 'rhel2' succeeded
CRS-2672: Attempting to start 'ora.cssdmonitor' on 'rhel2'
CRS-2676: Start of 'ora.cssdmonitor' on 'rhel2' succeeded
CRS-2672: Attempting to start 'ora.cssd' on 'rhel2'
CRS-2672: Attempting to start 'ora.diskmon' on 'rhel2'
CRS-2676: Start of 'ora.diskmon' on 'rhel2' succeeded
CRS-2676: Start of 'ora.cssd' on 'rhel2' succeeded
CRS-2672: Attempting to start 'ora.ctssd' on 'rhel2'
CRS-2676: Start of 'ora.ctssd' on 'rhel2' succeeded
CRS-2672: Attempting to start 'ora.asm' on 'rhel2'
CRS-2676: Start of 'ora.asm' on 'rhel2' succeeded
CRS-2672: Attempting to start 'ora.crsd' on 'rhel2'
CRS-2676: Start of 'ora.crsd' on 'rhel2' succeeded
CRS-2672: Attempting to start 'ora.evmd' on 'rhel2'
CRS-2676: Start of 'ora.evmd' on 'rhel2' succeeded
Timed out waiting for the CRS stack to start.
之前曾经有人遇到过这个问题：
参考1说的是网卡名称不一样，而我的都一样。
参考2说的是防火墙没关，而我的也关了。
参考3说需要重启一下机子再重新执行root.sh，我这样做了，结果还是有问题。
而且每次都是第一次执行root.sh的时候报：
Timed outwaiting for the CRS stack to start
如果清除了注册信息，即执行：
/u01/app/11.2.0/grid/crs/install/rootcrs.pl -deconfig -verbose -force
之后，再执行root.sh，则报的错跟第一次就不一样了：
CRS-2672: Attempting to start 'ora.mdnsd' on 'rhel2'
CRS-2676: Start of 'ora.mdnsd' on 'rhel2' succeeded
CRS-2672: Attempting to start 'ora.gipcd' on 'rhel2'
CRS-2676: Start of 'ora.gipcd' on 'rhel2' succeeded
CRS-2672: Attempting to start 'ora.gpnpd' on 'rhel2'
CRS-2676: Start of 'ora.gpnpd' on 'rhel2' succeeded
CRS-2672: Attempting to start 'ora.cssdmonitor' on 'rhel2'
CRS-2676: Start of 'ora.cssdmonitor' on 'rhel2' succeeded
CRS-2672: Attempting to start 'ora.cssd' on 'rhel2'
CRS-2672: Attempting to start 'ora.diskmon' on 'rhel2'
CRS-2676: Start of 'ora.diskmon' on 'rhel2' succeeded
CRS-2676: Start of 'ora.cssd' on 'rhel2' succeeded
CRS-2672: Attempting to start 'ora.ctssd' on 'rhel2'
CRS-2676: Start of 'ora.ctssd' on 'rhel2' succeeded
CRS-2672: Attempting to start 'ora.asm' on 'rhel2'
CRS-5011: Check of resource "+ASM" failed: details at "(:CLSN00006:)" in "/u01/app/11.2.0/grid/log/rhel2/agent/ohasd/oraagent_grid/oraagent_grid.log"
CRS-2674: Start of 'ora.asm' on 'rhel2' failed
CRS-2679: Attempting to clean 'ora.asm' on 'rhel2'
CRS-5011: Check of resource "+ASM" failed: details at "(:CLSN00006:)" in "/u01/app/11.2.0/grid/log/rhel2/agent/ohasd/oraagent_grid/oraagent_grid.log"
CRS-2681: Clean of 'ora.asm' on 'rhel2' succeeded
CRS-4000: Command Start failed, or completed with errors.
Command return code of 1 (256) from command: /u01/app/11.2.0/grid/bin/crsctl start resource ora.asm -init
Start of resource "ora.asm -init" failed
Failed to start ASM
Failed to start Oracle Clusterware stack 安装环境如下：
数据库服务器：Red Hat 5.4，Red Hat 6.4，64位
存储服务器：openfiler 2.99,64位
rac：oracle 11gR2 11.2.0.1,64位 存储使用openfiler，在数据库服务器端没有使用ASMlib（之前使用过，报同样的错），后来使用udev直接做了磁盘的固定路径。数据库服务器，存储服务器均使用的惠普pc机（一共3台）。数据库服务器RedHat 5和RedHat 6都尝试过。多说一句，在PC机上安装RedHat 5的时候费了好大周折，应该是PC预配置针对windows做了某些优化。虽然我们早已被微软绑架，但可悲的不是我们染上了大烟瘾，而是娱乐场所已经免费供应了。
试了好多方式解决不了，最后竟然发现，是交换机的问题！
之前的交换机，我使用TP-LINK的TL-WDR4310型号750M双频千兆路由器，充当交换机使用：
真的没想到会有问题。后来去别的部门借了一部个头大一点专业一点的8口交换机：
再试了一下，竟然通过了！
看来如果在实体机上安装oracle rac还是尽量使用专业设备。