XtremIO – Redefining Snapshots

Itzikr's Blog

A guest post by Tamir Segal, Senior PM

Snapshots is a technology that enables creating copies of volumes. XtremIO has developed a snapshot embedment that provides the ability to create space efficient snapshots that are managed as standard volumes in the cluster and have the same performance capabilities and data services as production volumes. In this post I provide a general explanation on legacy snapshot implementation, and explain what makes an XtremIO snapshot different.

Some Background

Legacy implementation of snapshot was based on technology called Copy-On-First-Write. The idea of Copy-On-First-Write is that once a snapshot is created, a new storage pool is defined in the system; every write to the production volume triggers a data movement operation to the snapshot pool:

· A new write is received by the system on LBA X

· The system reads the original data on LBA X from the production volume

· The system…

View original post 2,316 more words

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