MongoDB on EC2: XFS or EXT4 preferred? Inconsistence in mongo docs?

[Matthieu Rigal]

Hi all,

When following this chapter: https://docs.mongodb.com/ecosystem/platforms/amazon-ec2/#manually-deploy-mongodb-on-ec2 we are encouraged to deploy mongo on EC@ using EXT4 filesystem.

But on the following page https://docs.mongodb.com/manual/administration/production-checklist/#operations-checklist it is strongly recommended to use XFS (what we did until now)

XFS is not installed by default, but can be easily added with yum, as specified here: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ssd-instance-store.html

Now the question, is still XFS the recommended file systems for all Mongo (especially WiredTiger) deployments? If yes should the docs for EC2 be adjusted?

Best,

Matthieu

[Stephen Steneker]

Hi Matthieu,

Thanks for pointing this out .. there is indeed a discrepancy in the EC2 deployment examples which should be updated to match the production notes. I've raised https://jira.mongodb.org/browse/DOCS-8028 for this.

As per the production notes, our strong recommendation is to use XFS for WiredTiger deployments as EXT4's journalling may result in periodic stalls (see: SERVER-18314).

Regards,

Stephen