OEM 13C禁用"Global Cache Blocks Lost Metric"报警信息

前言

最近OEM刚刚部署好，配置好邮件报警功能后，会比较频繁的报警如下信息：

EM Event: Critical:szceb_szceb1 - Metrics Global Cache Blocks Lost is at 264

Host=xxxxx1 
Target type=Database Instance 
Target name=xxxxx_xxxxx1 
Categories=Error 
Message=Metrics Global Cache Blocks Lost is at 264 
Severity=Critical 
Event reported time=Aug 6, 2020 5:17:56 PM CST 
Operating System=Linux
Platform=x86_64
Associated Incident Id=86 
Associated Incident Status=New 
Associated Incident Owner= 
Associated Incident Acknowledged By Owner=No 
Associated Incident Priority=None 
Associated Incident Escalation Level=0 
Event Type=Metric Alert 
Event name=rac_global_cache:lost 
Metric Group=Global Cache Statistics
Metric=Global Cache Blocks Lost
Metric value=264
Key Value= 
Rule Name=Incident management rule set for all targets,Create incident for critical metric alerts 
Rule Owner=System Generated 
Update Details:
Metrics Global Cache Blocks Lost is at 264

对于该问题，可能网络会存在问题，简单的搜索并诊断后，发现网络目前看不出啥问题。

集群日志也正常，但是邮件确是报了很多次，想着先把这类信息禁用掉，待查明看是否真的存在问题在决定是否启用。

如何禁用

参考如下mos文档：

EM 13c: How to disable "Global Cache Blocks Lost Metric" Using EMCLI (Doc ID 2543134.1)

EM 13c, 12c: 'emcli modify_collection_schedule' Command Shows Collection Name Is Not Valid (Doc ID 2521116.1)

在OEM服务器，

[oracle@oem13c ~]$ cd $OMS_HOME/bin
[oracle@oem13c bin]$ ./emcli login -username=sysman
Enter password : 

Login successful
[oracle@oem13c bin]$ ./emcli sync
Synchronized successfully
[oracle@oem13c bin]$ $OMS_HOME/bin/emcli modify_collection_schedule -targetType="oracle_database" -targetNames="xxxxx1" -collectionName="rac_global_cache_10i" -collectionStatus=Disabled -preview="N"
oracle_database : Collection Name not valid.

哦豁，直接报错oracle_database : Collection Name not valid了。

网上搜不到啥信息，搞了半个多钟发现邮件内容中有包含有Target name的名字，可能是命令中的-targetNames="xxxxx1"是有问题的？

由于Doc ID 2543134.1中给的示例为

因此我是直接将<DBInstanceName>换成实例名了，结果貌似不对。用邮件中Target name对应的名字再试试看，

[oracle@oem13c bin]$ ./emcli modify_collection_schedule -targetType="oracle_database" -targetNames="xxxxx_xxxxx1" -collectionName="rac_global_cache_10i" -collectionStatus=Disabled -preview="N"       
Collection Name : rac_global_cache_10i
szceb_szceb1 : Collection Schedule updated successfully.
The collection schedule of the following metrics might be affected :
rac_global_cache

em......

有时候觉得mos的内容也挺坑的......

由于不止target name报出来，那么先只禁用这个，看看还会不会报，在禁用其他的。