dm-vdo is a device mapper target that provides block level deduplication, compression, and thin provisioning. It can be difficult to predict how much storage can be saved with dm-vdo because deduplication and compression are very data dependent. Now there is an open source vdoestimator tool that can be used to scan a filesystem or block device for duplicate and compressible blocks using the same indexing and compression technology used by dm-vdo. While there are general guidelines for provisioning a dm-vdo volume for some common workloads, the vdoestimator may help to get a better estimate for specific data.
This session will demonstrate how to use the vdoestimator tool and interpret the results with some examples. A brief overview of how dm-vdo and the vdoestimator work will help to clarify how best to do that.
