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PARDA the Plan?

by Cameron Haight  |  February 16, 2009  |  1 Comment

I just came across an interesting paper on a VMware project called PARDA.  The acronym stands for Proportional Allocation of Resources for Distributed Storage Access and represents an attempt to potentially deal with increasing virtualization I/O concerns using a "proportional-share resource scheduler that can provide service differentiation for I/O like VMware already provides for CPU and Memory."  Interesting charts that show that the target is to address latency and not necessarily bandwidth.  While many clients that I speak to suggest that they focus most on memory in terms of costs, they also cite that from a performance standpoint they often concentrate primarily on storage I/O so this could very interesting.  It does though seem to potentially create an interesting scenario for virtualization consumers, i.e.,., do I use a common VM-oriented I/O scheduler that is seemingly independent of the back-end storage, or do I use array-based service controlling mechanisms that may be independent of the underlying VM technology platform? 

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Cameron Haight
Research VP
10 years at Gartner
30 years IT industry

Cameron Haight is a research vice president in Gartner Research. His primary research focus is on the management of server virtualization and emerging cloud computing environments. Included in this effort is… Read Full Bio


Thoughts on PARDA the Plan?


  1. Irfan says:

    Hi Cameron:

    Thanks for providing coverage for the recently published research paper on PARDA (and for linking to my blog). I’m also writing a series of posts (http://virtualscoop.org/) explaining PARDA in easy to understand terms.

    Like you said, one interesting question is whether to use “a common VM-oriented I/O scheduler that is seemingly independent of the back-end storage, or do I use array-based service controlling mechanisms that may be independent of the underlying VM technology platform?” One advantage the PARDA approach might have is the ability to provide per-VM level proportional sharing.

    Irfan, VMware, Inc.
    http://virtualscoop.org/



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