Determining the space savings of virtual data optimizer (VDO) in RHEL 7.5 Beta

In the previous blog, we talked about the concepts behind virtual data optimizer (VDO) and how to configure it with Red Hat Enterprise Linux (RHEL) 7.5 Beta.  In the last step, we created a VDO volume.

In this blog we are going to experiment and observe real world savings on storage. For the experiment, I am not going to use any artificially generated workload but, rather, we’ll follow the simplest way by introducing some data on the disk and then multiplying the same data on the disk with a different name. This simple exercise can ensure that we are adding redundant data to disk to trigger deduplication.

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Understanding the concepts behind Virtual Data Optimizer (VDO) in RHEL 7.5 Beta

In the Red Hat Enterprise Linux 7.5 Beta, we introduced virtual data optimizer (VDO). VDO is a kernel module that can save disk space and reduce replication bandwidth. VDO sits on top of any block storage device and provides zero-block elimination, deduplication of redundant blocks, and data compression. These are the key phases of the data reduction process that allows VDO to reduce data footprint on storage. VDO applies these phases inline and on-the-fly.  Now, lets see what happens in each process (download the beta yourself and try):

Continue reading “Understanding the concepts behind Virtual Data Optimizer (VDO) in RHEL 7.5 Beta”