为什么同样方法安装的ASM数据库，一个监听器中有ASM实例，一个没有？
如下，我是刚接触ASM，整个结构了解的不是很清晰，前辈们能大致描述下这个结构和如何运作吗？
特别是这个监听，我看了两台机器的listener.ora,tnsnames.ora没有特别设置啊！
Services Summary...
Service "+ASM" has 1 instance(s).
Instance "+ASM", status BLOCKED, has 1 handler(s) for this service...
Service "+ASM_XPT" has 1 instance(s).
Instance "+ASM", status BLOCKED, has 1 handler(s) for this service...
Service "PLSExtProc" has 1 instance(s).
Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "mydb" has 1 instance(s).
Instance "mydb", status READY, has 2 handler(s) for this service...
Service "mydb_XPT" has 1 instance(s).
Instance "mydb", status READY, has 2 handler(s) for this service...
The command completed successfully
Services Summary...
Service "PLSExtProc" has 1 instance(s).
Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "terrydb1" has 1 instance(s).
Instance "terrydb1", status READY, has 1 handler(s) for this service...
Service "terrydb1XDB" has 1 instance(s).
Instance "terrydb1", status READY, has 1 handler(s) for this service...
Service "terrydb1_XPT" has 1 instance(s).
Instance "terrydb1", status READY, has 1 handler(s) for this service...
The command completed successfully
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