由于断电， MetroCluster SAN 主机 IO 超时

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适用场景

ONTAP MetroCluster
Hyper-V

问题描述

在站点断电期间， UPS 电池完全放电，从而导致 [1] 使用 SAN SVM 的延伸型双节点 MetroCluster 发生灾难恢复自动切换（ AUSO ）
尽管切换在 SLA 范围内，但 Hyper-V 主机遇到 IO 超时（超过 120 秒）
CIFS 共享访问中断

pmcsas_admin_0: sas.port.down:debug]: SAS port "0b" went down.
 pmcsas_admin_0: sas.port.down:debug]: SAS port "2a" went down.
 pmcsas_asyncd_2: sas.adapter.online:info]: SAS adapter 2a is now online.
 pmcsas_asyncd_0: sas.adapter.online:info]: SAS adapter 0b is now online.
 fmmbx_instanceWorker: fmmb.instStat.change:info]: normal mailbox instance on DR Partner side.
 stackmon_thread: stackmon.workqueue.emptied:debug]: One or more shelves have been reconciled successfully.
 monitor: monitor.globalStatus.ok:notice]: The system's global status is normal.
 DR_heartbeat_thread: mcc.config.auso.stDisabled:error]: The state of Automatic Unplanned Switchover capability has been disabled.
 DR_heartbeat_thread: cf.fmns.readSparecore:debug]: UID of the partners sparecore disk that is being read from the partner's mailbox is 0

DR_heartbeat_thread: mcc.auso.triggered:notice]: The node has triggered an Automatic Unplanned Switchover of the DR partner. Reason: DR partner Hearbeat Lost. If Automatic Unplanned Switchover was triggered because of heartbeat loss, any ongoing dump on the partner may be aborted