Good post by Chris M Evans (thank you)
News has emerged about a potential upgrade issue with the latest version of O/S code for the EMC XtremIO all-flash platform. As discussed in this blog post, the upgrade to XIOS 3.0 is not simply disruptive but is destructive. According to Chris Mellor’s post, the reason for the destructive nature of the upgrade is to change the on-disk de-duplication block size from 4K to 8K in order to ensure metadata can be managed efficiently.
Read on here