Windows systems

Complete the following steps to enable and configure multipathing for disk storage.

Procedure

Ensure that the Multipath I/O feature is installed. If needed, install additional vendor-specific multipath drivers. For IBM FlashSystem® devices, use the Microsoft Device Specific Module (MSDSM). For installation instructions, see the IBM FlashSystem documentation https://www.ibm.com/support/knowledgecenter/STHGUJ_8.3.1/com.ibm.storwize.v5000.831.doc/svc_w2kmpio_21oxvp.html
To verify that disks are visible to the operating system and are managed by multipath I/O, open a Microsoft Windows Power Shell command prompt and issue the following command:
```
mpclaim -e
```

Review the mpclaim output and ensure that the IBM storage is reported as under MPIO control.

"Target H/W Identifier   "   Bus Type     MPIO-ed      ALUA Support
-------------------------------------------------------------------------------
"IBM     2145            "   SAS          YES          Implicit Only

Additional details of attach disk devices can be obtained using the Windows wmic command.
```
wmic diskdrive get
```

To bring new disks online and clear the read-only attribute, run diskpart.exe with the following commands. Repeat for each of the disks:


diskpart
   select Disk 1
   online disk
   attribute disk clear readonly
   select Disk 2
   online disk       
   attribute disk clear readonly
   < ... >
   select Disk 49
   online disk
   attribute disk clear readonly   
   exit