Assigning and initializing flash devices
You need to assign a flash device on the host exclusively to Flash Accel before you can cache VMs on the host. You also need to format, or initialize, the device for caching.
Before you begin 
The flash device must be IBM-qualified, and it must have been installed according to the instructions that came with the device.
About this task 
After you assign the flash device to the host, you cannot manage the device using the vSphere Client. The device no longer appears in the Configuration > Storage Adapters details page.
Steps 
1.
From the Host Inventory page of the FAMC, click the wrench icon for the host on which you want to assign the flash device and select Flash Device > Assign.
The Select flash device dialog opens.
2.
3.
The Initialize flash device dialog opens.
4.
Note: Initializing the device performs a low-level format, deleting all data on the device.
Initialization can take several minutes, depending on the size of the device.
Result 
The flash device is listed in the Cache Device ID field for the host. The size of the device is listed in the Cache Size field.