christoskaramanolis

Christos Karamanolis

Chief Architect and Principal Engineer, Storage and Availability

Biography

Christos is the Chief Architect and a Principal Engineer in the Storage and Availability Engineering Organization at VMware. He has over 20 years of research and development experience in the fields of distributed systems, fault tolerance, storage and storage management. He is the architect of Virtual SAN (VSAN), a new distributed storage system, and vSphere's policy-based storage management stack (S-PBM, VASA). Previously, he worked on the ESX storage stack (NFS client and vSCSI filters) and Disaster Recovery (vSphere Replication). Prior to joining VMware in 2005, Christos spent several years at HP Labs as a researcher working on new-generation storage products. He started his career as an Assistant Professor at Imperial College, while he also worked as an independent IT consultant. He has co-authored more than 20 research papers in peer-reviewed journals and conferences and has 24 granted patents. He holds a PhD in Distributed Computing from Imperial College, University of London, UK.

Posts by Christos Karamanolis

christoskaramanolis

2014 Prediction: The Democratization of Storage Management

December 17, 2013
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A year ago I predicted that 2013 will be the time when Software-Defined Storage (SDS) will take off, with credible products either being released for the first time or reaching a maturity level that can be taken seriously as an alternative to traditional storage. Hype aside, SDS does reflect a major shift in how storage is managed and consumed in the data center. See my 2013 predictions blog for a definition of SDS. Also, look for a forthcoming blog by my colleague Richard McDougall that discusses the disruption of converged storage infrastructure and the industry trends that are causing it. Indeed, a number of pioneers in the field, mostly products by startups, have begun gaining good traction with customers. Moreover, VMware released...

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christoskaramanolis

2013 predictions: The year of software-defined storage?

December 18, 2012
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2012 has been the year of “software-defined datacenter“. Another buzzword? Perhaps, but nevertheless it captures a tectonic shift happening in the IT industry. As a colleague, William Earl, commented in a blog post earlier this year, the increasing power of low-cost servers is making it possible to replace specialized hardware with general-purpose servers plus software. That’s software that abstracts, pools together, and manages the different resources in datacenters. Virtualization has been doing this for CPU and memory for ages. 2012 has been the year of “software-defined networking” (SDN) – the concept is gaining momentum beyond the few big players (such as Google and Facebook) that use SDN ( Openflow specifically) in their datacenters for years now. The popularization of SDN is driven...

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A Preview of Distributed Storage

September 7, 2012
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A Preview of Distributed Storage

VMware shared a technology preview of Distributed Storage at VMworld 2012 as part of our broader storage strategy . Steve Herrod described this technology as “virtual SAN” in his Day 1 keynote at VMworld. Distributed Storage (DS), currently under development by VMware engineers, is a distributed layer of software running natively as part of the ESX hypervisor. It aggregates the hosts’ local storage devices (SSD and HDD) and makes them appear as a single pool of storage shared across all hosts. In other words, we are doing with local storage what we have done in the past with CPU and memory – virtualize the physical resources of ESX hosts and turn them into pools that can be carved up and assigned...

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