I'm looking at SCSI xcopy version 2 lite, what Microsoft calls Offloaded Data Transfer (ODX). It facilitates "point in time" copies via ROD (representation of data) tokens. This is almost a perfect mechanism for backups on a live system (i.e. consistent, almost no down time). With the help of a file system log it seems to solve the storage side of what VMWare calls vMotion: the ability to move a VM from one server to another while it is operating. Nicolas Bellinger's Linux target subsystem is part of the way toward implementing ODX; it already implements the building block behind VMWare's VAAI in this area (i.e. SCSI xcopy version 1).
The redundant array of independent disks (RAID) is a remnant of the age of rotating disks. File systems should forget about it when looking to the future.
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