存储链路问题导致的RAC异常
昨天，有人加我，说遇到了RAC问题。 环境是oracle 11.0.2.4，2节点。情况如下，CRSD宕了，集群不会自动切换。并且出现了好几次了。
我让这哥们儿提供了日志。
通过日志，可以看到1、2节点CRSD服务REBOOT只差1秒钟；Voting file /dev/raw/raw1不能提供服务只差2秒钟。 两节点CRSD同时重启，几乎已经可以断定不是RAC自身问题。
节点1：2016-03-18 23:25:38.643:[cssd(6930)]CRS-1615:No I/O has completed after 50% of the maximum interval. Voting file /dev/raw/raw1 will be considered not functional in 99220 milliseconds
2016-03-18 23:26:58 CRSD REBOOTCRSD exiting: Could not init OCR, code: 26
节点2：2016-03-18 23:25:36.834:[cssd(6590)]CRS-1615:No I/O has completed after 50% of the maximum interval. Voting file /dev/raw/raw1 will be considered not functional in 99760 milliseconds
2016-03-18 23:26:59 CRSD REBOOTCRSD exiting: Could not init OCR, code: 26
再看OS日志，远程光纤口（WWN = 50:0b:34:20:0f:f4:f8:08）连通性丢失。 到这里肯定是存储链路出现问题了。 节点1Mar 18 23:26:38 xxxxr01 kernel: bfa 0000:81:00.0: Remote port (WWN = 50:0b:34:20:0f:f4:f8:08) connectivity lost for logical port (WWN = 21:00:00:24:ff:09:a5:8a)Mar 18 23:26:38xxxxr01kernel: bfa 0000:81:00.0: Target (WWN = 50:0b:34:20:0f:f4:f8:08) connectivity lost for initiator (WWN = 21:00:00:24:ff:09:a5:8a)
节点2Mar 18 23:26:48 xxxx02 kernel: bfa 0000:81:00.0: Remote port (WWN = 50:0b:34:20:0f:f4:f8:08) connectivity lost for logical port (WWN = 21:00:00:24:ff:09:a5:a2)Mar 18 23:26:48 xxxr02 kernel: bfa 0000:81:00.0: Target (WWN = 50:0b:34:20:0f:f4:f8:08) connectivity lost for initiator (WWN = 21:00:00:24:ff:09:a5:a2)
今天，又和这哥们儿聊了聊，已经联系存储厂商来检查存储链路。存储是宏杉的，我第一次听说有国产存储，也算长见识了。
RAC中，出现问题，很多时候并不是RAC自身问题。存储链路出现问题造成RAC无法提供服务的事情我已经遇到好几次了。DBA遇到RAC异常，软件和硬件都要注意排查，这样才能快速定位问题。
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