验证dismount 磁盘组会不会把未使用的 ASM 磁盘组dismount

记一次
登录数据库查看大量library cache lock ,log file switch (archiving needed),归档失败，redo log无法重用。
因 备份一体机每次备份后会DISMOUNT BAKDG，这个动作为导致数据库实例将"卸载"未使用的 ASM 磁盘组,ARCHDG在这种机制下被DISMOUNT,当数据库需要归档时会自动MOUNT ARCHDG，
但由于备份一体机某磁盘块异常,导致问题发生。

为了验证dismount 磁盘组会不会"卸载"未使用的 ASM 磁盘组
实验开始
给我的虚拟机添加asm共享磁盘

datadg3是2021年的时候加上去的，bak是刚加上去的,
 为数据库添加磁盘组 https://www.modb.pro/db/334980
磁盘组使用情况，注意一下datadg3和bakdg的磁盘

因每次备份都需要先把bakdg的盘dismount ，在mount ，（具体什么机制不知道），
实验是我手动把bakdg的盘dismount，看看会不会有什么问题？

Disconnected from Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version 19.9.0.0.0
[grid@oadb1:/home/grid]$ sqlplus / as sysasm
SQL*Plus: Release 19.0.0.0.0 - Production on Mon Feb 21 14:03:31 2022
Version 19.9.0.0.0
Copyright (c) 1982, 2020, Oracle.  All rights reserved.
Connected to:
Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version 19.9.0.0.0
SQL>  alter diskgroup  BAKDG dismount;
Diskgroup altered.

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db alert

2022-02-21T11:12:33.465395+08:00
Domain Action Reconfiguration started (domid 2, new da inc 2, cluster inc 4)
Instance 2 is attaching to domain 2 
 Global Resource Directory partially frozen for domain action
 Non-local Process blocks cleaned out
 Set master node info 
 Dwn-cvts replayed, VALBLKs dubious
 All grantable enqueues granted
Domain Action Reconfiguration complete (total time 0.0 secs) 
2022-02-21T11:12:36.346703+08:00
Domain Action Reconfiguration started (domid 3, new da inc 2, cluster inc 4)
Instance 2 is attaching to domain 3 
 Global Resource Directory partially frozen for domain action
 Non-local Process blocks cleaned out
 Set master node info 
 Dwn-cvts replayed, VALBLKs dubious
 All grantable enqueues granted
Domain Action Reconfiguration complete (total time 0.1 secs) 
2022-02-21T14:03:47.924817+08:00
SUCCESS: diskgroup DATADG3 was dismounted                         <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<


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