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March 11, 2010

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Dan Megehee

Does it REALLY change everything?

You point out that the three historic constraints of distribution across large geographic distances are still limited by the speed of light and cost. You also point out that caching has historically been used to effectively "speed" slow devices. And, you point that maintaining a consistent cache across global distances is far from trivial - without introduction of limiting mechanisms that in the past have caused them to be far less effective.

I think you understate the dependence on new algorithms we find ourselves. Traditional approaches all (that I'm aware of anyway) seem to assume that messages messages hit the cache in the order they were sent. With increased distances between nodes, this becomes less likely to be true. Your example of vast transaction based systems points to this. It's likely that sooner or later a transaction will hit the distributed system "out of order" without some sort of synchronization mechanism, and adding the sync using technology and approaches I'm aware of would tend to show a transactional system to much for most high transaction column situations.

Yes, it's not expensive to create large high speed caches. But, we're still limited by the speed of light in syncing access to the various cache components. I'd like to see some discussion on approaches to mitigate this issue.

Chuck Hollis

Hi Dan

Good thoughts.

Guaranteeing order-of-delivery is a well understood issue for enterprise storage types -- it arises from DR and consistency discussions -- including complex and interrelated applications that must be recoverable at a distance, and at multiple sites (think SRDF).

And, to hear more, we'll actually have to show you the product :-)

-- Chuck

Steve

Chuck, great piece. You know you could use Camtasia, record this with the slides. Benefits:
1) Less typing
2) More interesting multi-media for your audience
3) Be more 3parfarley like :)

Again, thoughtful piece.

Chuck Hollis

Thanks for the suggestion, but -- no.

My audience seems to prefer plain, old-fashioned and boring text. My blog posts are written in Notepad. Works for me!

-- Chuck

LAUS_eng

Chuck-

Perhaps you should start a weekly podcast series and I can upload to my iPod... I can listen to your material on my way to work...
Thoughts?

-Dave

Chuck Hollis

Hi LAUS_eng

Several people tell me that they use the Odiogo functionality on this site to download MP3s -- would that do?

-- Chuck

marc farley

Can't wait to hear the second hand reports from EMC World and the months of clarifications to follow. Its a very ambitious goal, but EMC is the one company that appears ready to become the modern version of 1960 IBM - despite what Larry Ellison thinks.

Martin G

Chuck, check out Sublime Text if you are still using Notepad...It's a great text editor...

Chuck Hollis

Thanks, Martin, I've downloaded it and am using it now. I like it already ...

-- Chuck

The comments to this entry are closed.

Chuck Hollis


  • Chuck Hollis
    Chief Strategist, VMware SAS BU
    @chuckhollis

    Chuck has recently joined VMware in a new role, and is quite enthused!

    Previously, he was with EMC for 18 years, most of them great.

    He enjoys speaking to customer and industry audiences about a variety of technology topics, and -- of course -- enjoys blogging.

    Chuck lives in Holliston, MA with his wife, three kids and four dogs when he's not travelling. In his spare time, Chuck is working on his second career as an aging rock musician.

    Warning: do not buy him a drink when there is a piano nearby.
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