A user runs the command “dd if=/dev/zero of=/dev/xvdfbs=1M” on a fresh blank EBS volume attached to a
Linux instance. Which of the below mentioned activities is the user performing with the command given above?

A.
Creating a file system on the EBS volume

B.
Mounting the device to the instance

C.
Pre warming the EBS volume

D.
Formatting the EBS volume

Explanation:
When the user creates a new EBS volume and is trying to access it for the first time it will encounter reduced
IOPS due to wiping or initiating of the block storage. To avoid this as well as achieve the best performance it is
required to pre warm the EBS volume. For a blank volume attached with a Linux OS, the “dd” command is
used to write to all the blocks on the device. In the command “dd if=/dev/zero of=/dev/xvdfbs=1M” the
parameter “if =import file” should be set to one of the Linux virtual devices, such as /dev/zero. The “of=output
file” parameter should be set to the drive that the user wishes to warm. The “bs” parameter sets the block size
of the write operation; for optimal performance, this should be set to 1 MB.