由于一个或多个密钥服务器不可用、删除NVE卷失败

• 删除NVE卷失败、并显示以下错误：

Cluster::> volume delete -vserver SVM1 -volume APP_01

Error: command failed: One or more key servers are unavailable for Vserver "SVM1". Use the "security key-manager
    external show-status -vserver SVM1" command to check the status of the key servers. Verify that the network
    configuration is correct.

• 外部密钥管理服务器无响应：

Cluster::> security key-manager external show-status -vserver SVM1

Node  Vserver  Key Server                   Status
----  -------  -------------------------------------------  ---------------
Cluster1-01
    SVM1
        172.XX.XXX.122:5696              not-responding
        172.XX.XXX.123:5696              not-responding
Cluster1-02
    SVM1
        172.XX.XXX.122:5696              not-responding
        172.XX.XXX.123:5696              not-responding
4 entries were displayed.