Dell Unity：由于 eVE 故障，SP 滚动重新启动

在 /var/lib/docker/devicemapper/metadata 中错误地创建了一个名为“ls”的无效文件。

SP 进入滚动重新启动，并在 /EMC/C4Core/log/start_c4.log（或 /mnt/ssdroot/EMC/C4Core/log/start_c4.log，如果 SP 处于服务模式，则显示 eVE 错误）：

Mon Aug  7 21:51:41 UTC 2017 CF: iwd: fully started in 0 seconds
Mon Aug  7 21:54:05 UTC 2017 CF: HA: eVE: Error: job cf.eVE stopped
Mon Aug  7 21:54:05 UTC 2017 CF: HA: eVE: stopping
Mon Aug  7 21:54:06 UTC 2017 CF: HA: eVE: Error: failed to stop eVE
Mon Aug  7 21:54:11 UTC 2017 c4_shutdown.sh: called with "-f"

根据 SP 上的 /EMC/CEM/log/eVE/eVE_startup.log，Docker 未运行：

Mon Aug  7 21:49:05 2017 /EMC/Platform/bin/eVE.pl: Cannot proceed. Docker service is not running
Mon Aug  7 21:49:05 2017 /EMC/Platform/bin/eVE.pl: Cannot proceed. Docker service is not running
Mon Aug  7 21:49:06 2017 /EMC/Platform/bin/eVE.pl: Cannot proceed. Docker service is not running

根据 /var/log/messages 的数据，Docker 服务失败，因为它无法加载设备文件“ls”：

2017-08-07T21:41:09+00:00 self docker[18109]: time="2017-08-07T21:41:09.996387324Z" level=error msg="[graphdriver] prior storage driver \"devicemapper\" failed: devmapper: Failed to load device files:Error looking up device ls:Unknown device ls"
2017-08-07T21:41:09+00:00 self docker[18109]: time="2017-08-07T21:41:09.996422502Z" level=fatal msg="Error starting daemon: error initializing graphdriver: devmapper: Failed to load device files:Error looking up device ls:Unknown device ls"
2017-08-07T21:41:10+00:00 self systemd[1]: docker.service: main process exited, code=exited, status=1/FAILURE

1. 删除 /var/lib/docker/devicemapper/metadata 中有问题的文件：

   rm -f /var/lib/docker/devicemapper/metadata/ls

2. 清除启动救援计数器：

   svc_rescue_state -c

3. 重新启动 SP。

   svc_shutdown -r