Skip to main content

Storage Virtualization: Multi-part series at IBM

Barry Whyte, has been writing a decent looking series on storage virtualziation:

The whole concept of virtualizing your storage network is a disruptive one. It doesn't matter which approach
you choose, it radically changes not only the way your storage administrator thinks about his job, but also the very fundamentals of how and where things are done. Once you have an abstraction device sitting in the middle of the SAN between your hosts and your storage, or even your storage and storage, the rules have changed.

I'm sure most readers are aware of the three main approaches in use today, for more detailed explanations, google is great. However while all these approaches provide in essence the same basic 'Cornerstones of Virtualization' there are some interesting side affects with some or all approaches.


  • Network Based - Appliance

    The device is a SAN appliance that sits in the data-path and all I/O flows through the device. The device is both target and initiator. It is the target of I/O requests from the host perspective and the initiator of I/O requests
    from the storage perspective. The redirection is performed by issuing new I/O requests to the storage.

  • Switch Based - Split-path

    The device is usually an intelligent switch that intercepts I/O requests on the fabric and redirects the frames to the correct stroage location. The actual I/O requests are themselves redirected.

  • Controller Based

    The device is a storage controller that provides an internal switch for external storage attachment. Here the storage controller intercepts and redirects I/O requests to the external storage as it would for internal storage. (I'm not sure if USP actually re-generates new I/O requests or simply forwards to original I/O - maybe someone can enlighten me)



Check out part1, part2, part3 and part4.

Comments

Popular posts from this blog

DeepLearningTrucker Part 1

Avastu Blog is migrating to IdeationCloud.com; 1st Jan 2009 live

YOU DON'T HAVE TO DO ANYTHING. WITHIN 2 SECONDS YOU WILL BE REDIRECTED TO THE NEW HOME OF AVASTU BLOG. PLEASE DO UPDATE AVASTU BLOG'S URL to : http://www.ideationcloud.com on your website.

I will send out emails personally to those who are using my link(s) on their sites.

Thanks much for your co-operation and hope you enjoy the new site and its cool new features :-)




Not like the site is unlive or something..on the contrary, its beginning to get a lot of attention already. Well most of the work is done, you don't have to worry about anything though:

What won't change

Links/Referrals: I will be redirecting the links (all links which you may have cross-posted) to IdeationCloud.com - so you don't have to do anything in all your posts and links. Although, I would urge however that you do change the permalinks, especially on your blogs etc yourselfThis blog is not going away anywhere but within a few months, I will consider discontinuing its usage. I won't obviously do …

Redhot Future Of IT Part I :Marketing yourself as IT professional

I had promised about the "RedHot IT Future Series" and so we discuss here how you should market yourself EFFECTIVELY as an IT professional in this new (and dangerous) web age! Web is the place where you're a hero today and villain tomorrow. While there are lots of professionals who are active on the web, not all are enjoying a good reputation as they got "personal" with others and got into a cockfight. The passive IT professional has nothing to lose but nothing to gain at all!

I know "marketing" might seem as a greasy term but the idea is to have the truth about you out there. You know you're a good person and your family knows that you're really smart person but the rest of the world doesn't!

So the question is how do I market myself on the web as a true "nouveau IT professional". A guy who companies will be tempted to pick up the phone as say "Hey, we wanna talk with you. Can you fly over to Palo Alto (or Guatemala or Johan…