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社区首页 >专栏 >小知识：Flex ASM特性对集群资源显示的影响

小知识：Flex ASM特性对集群资源显示的影响

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Alfred Zhao
发布于 2021-04-23 11:18:00
6820
发布于 2021-04-23 11:18:00
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文章被收录于专栏：从ORACLE起航，领略精彩的IT技术。从ORACLE起航，领略精彩的IT技术。

有客户咨询，认为19c RAC集群资源状态和11g RAC大不一样，比如在他们的19c集群，也是只部署2节点，却显示3个资源状态，其中第三个还是offline状态，担心是否有影响。

实际上这和Flex ASM特性有关，是正常的现象，其实不去修改也并不会影响什么。

找一个19c RAC（2 nodes）环境来演示，当前查询集群资源状态：

代码语言：javascript
复制
[grid@db193 ~]$ crsctl stat res -t
--------------------------------------------------------------------------------
Name           Target  State        Server                   State details       
--------------------------------------------------------------------------------
Local Resources
--------------------------------------------------------------------------------
ora.LISTENER.lsnr
               ONLINE  ONLINE       db193                    STABLE
               ONLINE  ONLINE       db195                    STABLE
ora.chad
               ONLINE  ONLINE       db193                    STABLE
               ONLINE  ONLINE       db195                    STABLE
ora.net1.network
               ONLINE  ONLINE       db193                    STABLE
               ONLINE  ONLINE       db195                    STABLE
ora.ons
               ONLINE  ONLINE       db193                    STABLE
               ONLINE  ONLINE       db195                    STABLE
--------------------------------------------------------------------------------
Cluster Resources
--------------------------------------------------------------------------------
ora.ASMNET1LSNR_ASM.lsnr(ora.asmgroup)
      1        ONLINE  ONLINE       db193                    STABLE
      2        ONLINE  ONLINE       db195                    STABLE
      3        OFFLINE OFFLINE                               STABLE
ora.CRS.dg(ora.asmgroup)
      1        ONLINE  ONLINE       db193                    STABLE
      2        ONLINE  ONLINE       db195                    STABLE
      3        ONLINE  OFFLINE                               STABLE
ora.DATA.dg(ora.asmgroup)
      1        ONLINE  ONLINE       db193                    STABLE
      2        ONLINE  ONLINE       db195                    STABLE
      3        ONLINE  OFFLINE                               STABLE
ora.LISTENER_SCAN1.lsnr
      1        ONLINE  ONLINE       db193                    STABLE
ora.asm(ora.asmgroup)
      1        ONLINE  ONLINE       db193                    Started,STABLE
      2        ONLINE  ONLINE       db195                    Started,STABLE
      3        OFFLINE OFFLINE                               STABLE
ora.asmnet1.asmnetwork(ora.asmgroup)
      1        ONLINE  ONLINE       db193                    STABLE
      2        ONLINE  ONLINE       db195                    STABLE
      3        ONLINE  OFFLINE                               STABLE
ora.cvu
      1        ONLINE  ONLINE       db193                    STABLE
ora.db193.vip
      1        ONLINE  ONLINE       db193                    STABLE
ora.db195.vip
      1        ONLINE  ONLINE       db195                    STABLE
ora.jydb.cmdb1.svc
      2        ONLINE  ONLINE       db193                    STABLE
ora.jydb.db
      1        ONLINE  ONLINE       db193                    Open,HOME=/u01/app/o
                                                             racle/product/19.3.0
                                                             /db_1,STABLE
      2        ONLINE  ONLINE       db195                    Open,HOME=/u01/app/o
                                                             racle/product/19.3.0
                                                             /db_1,STABLE
ora.qosmserver
      1        ONLINE  ONLINE       db193                    STABLE
ora.scan1.vip
      1        ONLINE  ONLINE       db193                    STABLE
--------------------------------------------------------------------------------
[grid@db193 ~]$

可以查看配置验证，确认就是Flex ASM，当前ASM配置实例数量为3：

代码语言：javascript
复制
[grid@db193 ~]$ asmcmd showclustermode
ASM cluster : Flex mode enabled - Direct Storage Access

[grid@db193 ~]$ srvctl config asm
ASM home: <CRS home>
Password file: +CRS/orapwASM
Backup of Password file: +CRS/orapwASM_backup
ASM listener: LISTENER
ASM instance count: 3
Cluster ASM listener: ASMNET1LSNR_ASM
[grid@db193 ~]$

而这个ASM实例数量其实也可以按需修改，比如： 修改ASM实例数量为4，查看集群资源状态： $ srvctl modify asm -count 4

代码语言：javascript
复制
[grid@db193 ~]$ srvctl modify asm -count 4
[grid@db193 ~]$ crsctl stat res -t
--------------------------------------------------------------------------------
Name           Target  State        Server                   State details       
--------------------------------------------------------------------------------
Local Resources
--------------------------------------------------------------------------------
ora.LISTENER.lsnr
               ONLINE  ONLINE       db193                    STABLE
               ONLINE  ONLINE       db195                    STABLE
ora.chad
               ONLINE  ONLINE       db193                    STABLE
               ONLINE  ONLINE       db195                    STABLE
ora.net1.network
               ONLINE  ONLINE       db193                    STABLE
               ONLINE  ONLINE       db195                    STABLE
ora.ons
               ONLINE  ONLINE       db193                    STABLE
               ONLINE  ONLINE       db195                    STABLE
--------------------------------------------------------------------------------
Cluster Resources
--------------------------------------------------------------------------------
ora.ASMNET1LSNR_ASM.lsnr(ora.asmgroup)
      1        ONLINE  ONLINE       db193                    STABLE
      2        ONLINE  ONLINE       db195                    STABLE
      3        OFFLINE OFFLINE                               STABLE
      4        OFFLINE OFFLINE                               STABLE
ora.CRS.dg(ora.asmgroup)
      1        ONLINE  ONLINE       db193                    STABLE
      2        ONLINE  ONLINE       db195                    STABLE
      3        ONLINE  OFFLINE                               STABLE
      4        ONLINE  OFFLINE                               STABLE
ora.DATA.dg(ora.asmgroup)
      1        ONLINE  ONLINE       db193                    STABLE
      2        ONLINE  ONLINE       db195                    STABLE
      3        ONLINE  OFFLINE                               STABLE
      4        ONLINE  OFFLINE                               STABLE
ora.LISTENER_SCAN1.lsnr
      1        ONLINE  ONLINE       db193                    STABLE
ora.asm(ora.asmgroup)
      1        ONLINE  ONLINE       db193                    Started,STABLE
      2        ONLINE  ONLINE       db195                    Started,STABLE
      3        OFFLINE OFFLINE                               STABLE
      4        OFFLINE OFFLINE                               STABLE
ora.asmnet1.asmnetwork(ora.asmgroup)
      1        ONLINE  ONLINE       db193                    STABLE
      2        ONLINE  ONLINE       db195                    STABLE
      3        ONLINE  OFFLINE                               STABLE
      4        ONLINE  OFFLINE                               STABLE
ora.cvu
      1        ONLINE  ONLINE       db193                    STABLE
ora.db193.vip
      1        ONLINE  ONLINE       db193                    STABLE
ora.db195.vip
      1        ONLINE  ONLINE       db195                    STABLE
ora.jydb.cmdb1.svc
      2        ONLINE  ONLINE       db193                    STABLE
ora.jydb.db
      1        ONLINE  ONLINE       db193                    Open,HOME=/u01/app/o
                                                             racle/product/19.3.0
                                                             /db_1,STABLE
      2        ONLINE  ONLINE       db195                    Open,HOME=/u01/app/o
                                                             racle/product/19.3.0
                                                             /db_1,STABLE
ora.qosmserver
      1        ONLINE  ONLINE       db193                    STABLE
ora.scan1.vip
      1        ONLINE  ONLINE       db193                    STABLE
--------------------------------------------------------------------------------

如果看起来很不习惯，也可以修改 srvctl modify asm -count 2 或者 srvctl modify asm -count ALL

代码语言：javascript
复制
[grid@db193 ~]$ srvctl modify asm -count ALL
[grid@db193 ~]$ crsctl stat res -t
--------------------------------------------------------------------------------
Name           Target  State        Server                   State details       
--------------------------------------------------------------------------------
Local Resources
--------------------------------------------------------------------------------
ora.LISTENER.lsnr
               ONLINE  ONLINE       db193                    STABLE
               ONLINE  ONLINE       db195                    STABLE
ora.chad
               ONLINE  ONLINE       db193                    STABLE
               ONLINE  ONLINE       db195                    STABLE
ora.net1.network
               ONLINE  ONLINE       db193                    STABLE
               ONLINE  ONLINE       db195                    STABLE
ora.ons
               ONLINE  ONLINE       db193                    STABLE
               ONLINE  ONLINE       db195                    STABLE
--------------------------------------------------------------------------------
Cluster Resources
--------------------------------------------------------------------------------
ora.ASMNET1LSNR_ASM.lsnr(ora.asmgroup)
      1        ONLINE  ONLINE       db193                    STABLE
      2        ONLINE  ONLINE       db195                    STABLE
ora.CRS.dg(ora.asmgroup)
      1        ONLINE  ONLINE       db193                    STABLE
      2        ONLINE  ONLINE       db195                    STABLE
ora.DATA.dg(ora.asmgroup)
      1        ONLINE  ONLINE       db193                    STABLE
      2        ONLINE  ONLINE       db195                    STABLE
ora.LISTENER_SCAN1.lsnr
      1        ONLINE  ONLINE       db193                    STABLE
ora.asm(ora.asmgroup)
      1        ONLINE  ONLINE       db193                    Started,STABLE
      2        ONLINE  ONLINE       db195                    Started,STABLE
ora.asmnet1.asmnetwork(ora.asmgroup)
      1        ONLINE  ONLINE       db193                    STABLE
      2        ONLINE  ONLINE       db195                    STABLE
ora.cvu
      1        ONLINE  ONLINE       db193                    STABLE
ora.db193.vip
      1        ONLINE  ONLINE       db193                    STABLE
ora.db195.vip
      1        ONLINE  ONLINE       db195                    STABLE
ora.jydb.cmdb1.svc
      2        ONLINE  ONLINE       db193                    STABLE
ora.jydb.db
      1        ONLINE  ONLINE       db193                    Open,HOME=/u01/app/o
                                                             racle/product/19.3.0
                                                             /db_1,STABLE
      2        ONLINE  ONLINE       db195                    Open,HOME=/u01/app/o
                                                             racle/product/19.3.0
                                                             /db_1,STABLE
ora.qosmserver
      1        ONLINE  ONLINE       db193                    STABLE
ora.scan1.vip
      1        ONLINE  ONLINE       db193                    STABLE
--------------------------------------------------------------------------------
[grid@db193 ~]$

这样看起来就像11g RAC集群那样很简洁了。 此时查询配置，确认当前ASM配置实例数量为ALL（当然如果你之前修改时指定2那这里也会显示是2）：

代码语言：javascript
复制
[grid@db193 ~]$ srvctl config asm
ASM home: <CRS home>
Password file: +CRS/orapwASM
Backup of Password file: +CRS/orapwASM_backup
ASM listener: LISTENER
ASM instance count: ALL
Cluster ASM listener: ASMNET1LSNR_ASM
[grid@db193 ~]$ asmcmd showclustermode
ASM cluster : Flex mode enabled - Direct Storage Access
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