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More on Virtual Tape

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Last week I talked about virtual tape solutions. On Monday HDS released the news that they’re reselling Diligent’s VTL solution. From memory, when I last saw this about 12 months ago, it was a software only solution for emulating tape, sure enough that’s still the same. Probably the more useful thing though is ProtecTIER, which scans all incoming data and proactively compresses the incoming stream by de-duplicating the data. The algorithm relies on a cache map of previously scanned data held in memory on the product’s server, with a claimed supported capacity of 1PB raw, or 25PB at the alleged 25:1 compression ratio.

As Hu Yoshida referenced the release on his blog, I asked the question on compression. 25:1 is a claimed average from customer experience, some customers have seen even greater savings.

So, my questions; what is performance like? What happens if the ProtecTIER server goes titsup (technical expression)? I seem to remember from my previous presentation on the product that the data was stored in a self referential form, allowing the archive index to be easily recreated.

If the compression ratio is true and performance is not compromised, then this could truly be a superb product for bringing disk based backup into the mainstream. Forget the VTL solution; just do straight disk based backups using something like Netbackup disk storage groups and relish in the benefits!!!

About Chris M Evans

Chris M Evans has worked in the technology industry since 1987, starting as a systems programmer on the IBM mainframe platform, while retaining an interest in storage. After working abroad, he co-founded an Internet-based music distribution company during the .com era, returning to consultancy in the new millennium. In 2009 Chris co-founded Langton Blue Ltd (www.langtonblue.com), a boutique consultancy firm focused on delivering business benefit through efficient technology deployments. Chris writes a popular blog at http://blog.architecting.it, attends many conferences and invitation-only events and can be found providing regular industry contributions through Twitter (@chrismevans) and other social media outlets.
  • Prem

    Sorry but this is out of topic..

    What is the RSS address of your blog.?? I have trouble adding you in rsspopper or rssreader.

  • Jeremiah Owyang

    Prem,

    All blogspot (blogger) accounts have this address for the RSS Feed. Add ‘atom.xml’ to the end of the URL:

    http://storagearchitect.blogspot.com/atom.xml

    Chris,

    I reccomend using feedburner, it makes life easier for folks to subscribe, and you get analytics on activity –basic features are free. Many bloggers add a small ‘chicklet’ image that can help users to quickly subscribe.

    We use that over on the HDS blogs.

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