问题及解决方案：Win 2008 R2——由于管理员设置的策略，该磁盘处于脱机状态

解决方案步骤如下：

使用DISKPART.exe命令 解除策略

1.运行：cmd

2.输入：DISKPART.exe搜索

3.DISKPART> san

4.DISKPART> san policy=onlineall

5.DISKPART>list disk

6.DISKPART> select disk 1

7.DISKPART>attributes disk clear readonly

8.DISKPART>online disk





附解决方案英文描述：

open a command
prompt and type “diskpart.exe”.

You will now receive a diskpart-prompt:

Diskpart>

Now type “san”.
This will provide you with the current configured SAN policy:

SAN Policy : Offline Shared

In the diskpart-prompt, type “san policy=OnlineAll”.

This will result in the following message:

Diskpart successfully changed the SAN policy for the current operating system.

Now type “list disk”,
which will give this message:

Disk ### Status Size Free Dyn Gpt

Disk 0 Online 30 GB 0 B

Disk 1 Offline 50 GB 1024 KB

In my case, disk 1 was offline so I typed “select
disk 1” which provided:

Disk 1 is now the selected disk

Now type “attributes disk clear readonly”.

Disk attributes cleared successfully.

And to check if all the settings are now correct, type “attributes
disk”.

This will give an output something like:

Current Read-only State : No

Read-only : No

Boot Disk : No

Pagefile Disk : No

Hibernation File Disk : No

Crashdump Disk : No

Clustered Disk : No

After the last check has been successful, type “online
disk” to bring the disk online.