A user is trying to pre-warm a blank EBS volume attached to a Linux instance. Which of the below mentioned
steps should be performed by the user?
A.
There is no need to pre-warm an EBS volume
B.
Contact AWS support to pre-warm
C.
Unmount the volume before pre-warming
D.
Format the device
Explanation:
When the user creates a new EBS volume or restores a volume from the snapshot, the back-end storage
blocks are immediately allocated to the user EBS. However, the first time when the user is trying to access a
block of the storage, it is recommended to either be wiped from the new volumes or instantiated from the
snapshot (for restored volumes. before the user can access the block. This preliminary action takes time and
can cause a 5 to 50 percent loss of IOPS for the volume when the block is accessed for the first time. To avoid
this it is required to pre warm the volume. Pre-warming an EBS volume on a Linux instance requires that the
user should unmount the blank device first and then write all the blocks on the device using a command, such
as “dd”.
Hi, although correct not to mount the volume before pre-warming.
This is an outdated question, pre-warming for NEW EBS volumes is not necessary any more, see: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-initialize.html
New EBS volumes receive their maximum performance the moment that they are available and do not require initialization (formerly known as pre-warming). For volumes that have been restored from snapshots, use the dd or fio utilities to read from all of the blocks on a volume. All existing data on the volume will be preserved.
Thanks,
Frank
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A blank volume. Pre warm not needed
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Yes, a blank volume. But if it is a volume that has been created from a snapshot, then pre-warming reduces I/O.
I agree with Frank, question is outdated. If A said “There is no need to pre-warm a ‘new’ EBS volume”, then it would have been correct.
Anyways, AWS use of language leaves a lot to be desired
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I vote for A
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A
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This is an outdated question.
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I vote for A too. Pre-warming not needed since it wasnt restored from snapshot
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