A user runs the command `dd if=/dev/xvdf of=/dev/null bs=1M` on an EBS volume created from a snapshot and attached to a Linux instance. Which of the below mentioned activities is the user performing with the step given above?
A.
Pre warming the EBS volume
B.
Initiating the device to mount on the EBS volume
The command dd if=/dev/xvdf of=/dev/null bs=1M is being used to read data from the EBS volume (specified as /dev/xvdf) and write it to the null device (/dev/null). This effectively reads data from the EBS volume, which is a way to access the data and pre-warm the volume.
Pre-warming an EBS volume involves reading all the data from the volume to ensure that it's loaded into the underlying storage blocks. This can improve the performance of the EBS volume, as it reduces the likelihood of experiencing initial latency when accessing the data for the first time.
B - https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-initialize.html
sudo dd if=/dev/xvdf of=/dev/null bs=1M is used to initialise your ebs volumes.
It's B. https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-initialize.html
[dd] The if (input file) parameter should be set to the drive you wish to initialize. The of (output file) parameter should be set to the Linux null virtual device, /dev/null. The bs parameter sets the block size of the read operation; for optimal performance, this should be set to 1 MB.
A. Pre warming the EBS volume.
Initializing and Pre-warming mean the same thing. However, answer B says initiating (not the same meaning as initializing) and the definition is off, too. "Empty EBS volumes receive their maximum performance the moment that they are created and do not require initialization (formerly known as pre-warming)." https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-initialize.html
Answer is B
The command "dd if=/dev/xvdf of=/dev/null bs=1M" is used for initializing Amazon EBS Volumes.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-initialize.html
The command used for pre warming the EBS volume is "dd if=/dev/zero of=/dev/xvdf bs=1M" as seen previously in the question 249.
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