一般在Flex集群，中心节点运行ASM实例，叶节点远程访问中心节点的ASM实例。
但是中心节点也可以不运行ASM实例而访问其他节点的ASM实例；另外，标准集群也可以启用Flex ASM。
由于有通过网络远程访问ASM实例的状况，因此也形成了ASM网络，ASM网络可与Private网络共用，即ASM&Private网络，可在安装界面指定。
确认当前ASM状态
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$ asmcmd showclustermode
- ASM cluster : Flex mode disabled
运行asmca，转换ASM为Flex ASM，以下是部分步骤截图
ASM的subnet与Public不同，将不能使用与Public相同的端口号
以root用户运行上图所示的脚本，将对集群内所有节点重启CRS
最后，确认当前集群模式
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$ asmcmd showclustermode
- ASM cluster : Flex mode enabled
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- #后两项是Flex ASM才有的
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$ srvctl config asm
ASM home:
Password file: +OCRV/orapwASM
ASM listener: LISTENER
ASM instance count: ALL
Cluster ASM listener: ASMNET1LSNR_ASM
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$ lsnrctl status ASMNET1LSNR_ASM
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LSNRCTL for Linux: Version 12.1.0.2.0 - Production on 01-JUN-2016 15:08:11
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Copyright (c) 1991, 2014, Oracle. All rights reserved.
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Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=ASMNET1LSNR_ASM)))
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STATUS of the LISTENER
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------------------------
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Alias ASMNET1LSNR_ASM
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Version TNSLSNR for Linux: Version 12.1.0.2.0 - Production
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Start Date 01-JUN-2016 15:02:46
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Uptime 0 days 0 hr. 5 min. 24 sec
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Trace Level off
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Security ON: Local OS Authentication
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SNMP OFF
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Listener Parameter File /u01/app/12.1.0/grid/network/admin/listener.ora
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Listener Log File /u01/app/grid/diag/tnslsnr/node2/asmnet1lsnr_asm/alert/log.xml
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Listening Endpoints Summary...
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(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=ASMNET1LSNR_ASM)))
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(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=10.1.1.2)(PORT=1522)))
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Services Summary...
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Service "+ASM" has 2 instance(s).
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Instance "+ASM1", status READY, has 1 handler(s) for this service...
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Instance "+ASM2", status READY, has 2 handler(s) for this service...
- The command completed successfully