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EFS Infrequent Access

Just like in S3, you can have to up to 92% in savings if you use Infrequent Access or IA with AWS EFS (Elastic File Storage). You can create a lifecycle policy to move data from standard storage to infrequent access. Files that are not being used after x number of days are then moved to Infrequent Access. The downside is, the data in IA do not count towards gaining burst credits. You will need to keep a certain amount of standard storage to prevent depleting your burst credits.

aws efs put-lifecycle-configuration \
--file-system-id fs-xxxxxxxx \
--lifecycle-policies TransitionToIA=AFTER_30_DAYS \
--region us-east-1

AWS CloudWatch EFS Burst Credits

Here’s how to get the EFS Burst Credits from CloudWatch via AWS CLI.

aws cloudwatch get-metric-statistics \
--namespace "AWS/EFS" \
--metric-name BurstCreditBalance \
--dimensions "Name=FileSystemId,Value=fs-xxxxxxx" \
--start-time 2019-12-31T00:00:00Z \
--end-time 2019-12-31T01:00:00Z \
--statistics Average \
--period 3600 \
--profile default

Notice the start time, end time, period and statistics. Here’s the CLI doc.

AWS EFS /etc/fstab

To automatically mount a EFS volume after each reboot, you’ll need to add the following format to /etc/fstab.

You can use the DNS name given by AWS.

fs-12345678:/ /mnt/efs efs defaults,_netdev 0 0

Or the IP address.

10.0.0.22:/ /mnt/efs efs defaults,_netdev 0 0

Mount all with fake and verbose.

mount -fav