Virtually Thin: Tuning XFS on Top of Device Mapper dm-thin

This proposal has been accepted as a session.


One Line Summary

Setting up a file system over a dm-thin device, although easy, can have poor performance if not done properly and can even cause data loss. This talk will walk through the dm-thin device configuration to be used by xfs filesystem to achieve good performance and avoid data loss.


The talk will show how to create a thin provisioned volume properly configured to be used by XFS filesystem and how to select a good data block size for the specific use case based on the physical device geometry.
It will also show the challenges involved in the process, like the possibility of data loss, usage of snapshots with large data block sizes, data fragmentation and journaling.


filesystem, xfs, dm-thin, thin provisioning


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