更新双节点 MetroCluster 配置

可在双节点 MetroCluster 配置中对 ONTAP 进行无中断升级以及在某些情况下进行无中断降级。此方法包括以下几个步骤：启动协商切换，更新故障站点上的集群，启动切换，然后对另一个站点上的集群重复该过程。

1. 将权限级别设置为高级，在提示是否继续时输入 y：set -privilege advanced
   随后将显示高级提示符（*>）。
2. 在要升级的集群上，安装新的 ONTAP 软件映像作为默认映像：system node image update -package package_location -setdefault true -replace-package true

   示例

   cluster_B::*> system node image update -package http://www.example.com/NewImage.tgz -setdefault true -replace-package true
   
3. 验证是否已将目标软件映像设置为默认映像：system node image show

   示例

   以下示例显示已将 NewImage 设置为默认映像：

   cluster_B::*> system node image show
                       Is      Is                           Install
   Node     Image      Default Current Version              Date
   -------- -------    ------- ------- -------------------- -------------------
   node_B_1
            OldImage  false   true    X.X.X                MM/DD/YYYY TIME
            NewImage  true    false   Y.Y.Y                MM/DD/YYYY TIME
   2 entries were displayed.
   
4. 如果未将目标软件映像设置为默认映像，则更改此设置：system image modify {-node * -iscurrent false} -isdefault true
5. 验证所有集群 SVM 是否处于某种运行状况状态：metrocluster vserver show
6. 在未更新的集群上，启动协商切换：metrocluster switchover

   此操作可能需要数分钟。可使用 metrocluster operation show 命令验证是否已完成切换。

   示例

   以下示例在远程集群（cluster_A）上执行协商切换。这会导致本地集群（cluster_B）暂停，以便可对其进行更新。

   cluster_A::> metrocluster switchover
    
   Warning: negotiated switchover is about to start. It will stop all the data
            Vservers on cluster "cluster_B" and
            automatically re-start them on cluster
            "cluster_A". It will finally gracefully shutdown
            cluster "cluster_B".
   Do you want to continue? {y|n}: y
   
7. 验证所有集群 SVM 是否处于某种运行状况状态：metrocluster vserver show
8. 在幸存集群上对数据聚合进行再同步：metrocluster heal -phase aggregates
   将 MetroCluster IP 配置升级到 ONTAP 9.5 或更高版本后，聚合将在再同步并返回镜像状态之前的短时间内处于降级状态。

   示例

   cluster_A::> metrocluster heal -phase aggregates
   [Job 130] Job succeeded: Heal Aggregates is successful.
   
9. 验证是否已成功完成修复操作：metrocluster operation show

   示例

   cluster_A::> metrocluster operation show
   Operation: heal-aggregates
   State: successful
   Start Time: MM/DD/YYYY TIME
   End Time: MM/DD/YYYY TIME
   Errors: -
   
10. 在幸存集群上对根聚合进行再同步：metrocluster heal -phase root-aggregates

    示例

    cluster_A::> metrocluster heal -phase root-aggregates
    [Job 131] Job succeeded: Heal Root Aggregates is successful.
    
11. 验证是否已成功完成修复操作：metrocluster operation show

    示例

    cluster_A::> metrocluster operation show
    Operation: heal-root-aggregates
    State: successful
    Start Time: MM/DD/YYYY TIME
    End Time: MM/DD/YYYY TIME
    Errors: -
    
12. 在暂停的集群上，从装入程序提示符处引导节点：boot_ontap
13. 等待引导过程完成，然后验证所有集群 SVM 是否处于某种运行状况状态：metrocluster vserver show
14. 从幸存集群上执行切换：metrocluster switchback
15. 验证是否已成功完成切换：metrocluster operation show

    示例

    cluster_A::> metrocluster operation show
    Operation: switchback
    State: successful
    Start Time: MM/DD/YYYY TIME
    End Time: MM/DD/YYYY TIME
    Errors: -
    
16. 验证所有集群 SVM 是否处于某种运行状况状态：metrocluster vserver show
17. 对另一个集群重复所有先前的步骤。
18. 验证 MetroCluster 配置是否正常：
    1. 检查配置：metrocluster check run

       示例

       cluster_A::> metrocluster check run
       Last Checked On: MM/DD/YYYY TIME
       Component           Result
       ------------------- ---------
       nodes               ok
       lifs                ok
       config-replication  ok
       aggregates          ok
       4 entries were displayed.
       
       Command completed. Use the "metrocluster check show -instance"
       command or sub-commands in "metrocluster check" directory for
       detailed results.
       To check if the nodes are ready to do a switchover or switchback
       operation, run "metrocluster switchover -simulate" or "metrocluster
       switchback -simulate", respectively.
       
    2. 如果要查看更多详细结果，请使用 metrocluster check run 命令：metrocluster check aggregate show metrocluster check config-replication show metrocluster check lif show metrocluster check node show
    3. 将权限级别设置为高级：set -privilege advanced
    4. 模拟切换操作：metrocluster switchover -simulate
    5. 查看切换模拟的结果：metrocluster operation show

       示例

       cluster_A::*> metrocluster operation show
           Operation: switchover
               State: successful
          Start time: MM/DD/YYYY TIME
            End time: MM/DD/YYYY TIME
              Errors: -  
       
    6. 恢复为管理员权限级别：set -privilege admin
    7. 对另一个集群重复执行上述子步骤。