VMWare ESXI VM unknown inaccessible

短短幾個月，已經遇到此問題三次，VM機器無法讀取，因為存放的硬碟變成全新的硬碟

詭異的是，重新增加進來變成全新硬碟，是正常的！可是這麼一來，資料將全部遺失。

徵狀：VM無法讀取

問題：ESXI HOST硬碟讀取異常

▲出問題時，VM所在硬碟無法讀取

▲少了一顆硬碟，無論Reflash或是Rescan都無效

▲但是Add Storage正常，可以安裝這顆硬碟，問題是這樣做，資料會全部遺失

原廠技術文件說明
轉述如下：
狀況：
※Cannot connect ESX/ESXi to VirtualCenter / vCenter Server
※Cannot connect directly to the ESX/ESXi host from the VMware Infrastructure Client / vSphere Client
※You cannot stop or start a virtual machine
※A virtual machine is shown as running in vCenter Server when it is not
※vCenter Server shows the error:
Virtual machine creation may fail because agent is unable to retrieve VM creation options from the host

解決方法：
To restart the management agents on ESXi:
1.Connect to the console of your ESXi host.
2.Press F2 to customize the system.
3.Log in as root.
4.Use the Up/Down arrows to navigate to Restart Management Agents.
Note: In ESXi 4.1 and ESXi 5.0, this option is available under Troubleshooting Options.
5.Press Enter.
6.Press F11 to restart the services.
7.When the service has been restarted, press Enter.
8.Press Esc to log out of the system.

經過以上動作，VM以及所在硬碟已經成功回來
但是不知道還會不會又再次出現此問題

原文：http://ithelp.ithome.com.tw/question/10095958