Linked by Thom Holwerda on Fri 18th Sep 2009 13:40 UTC, submitted by Robert Escue
Hardware, Embedded Systems This is an article which discusses the increase in storage capacity while performance and hard error rates have not improved significantly in years, and what this means for protecting data in large storage systems. "The concept of parity-based RAID (levels 3, 5 and 6) is now pretty old in technological terms, and the technology's limitations will become pretty clear in the not-too-distant future " and are probably obvious to some users already. In my opinion, RAID-6 is a reliability Band Aid for RAID-5, and going from one parity drive to two is simply delaying the inevitable."
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RE: Costs left out
by Robert Escue on Fri 18th Sep 2009 15:33 UTC in reply to "Costs left out"
Robert Escue
Member since:
2005-07-08

That only works if you have relatively small amounts of data that is not modified frequently. If you have a large operation with frequently changing data the potential for failure increases significantly.

I am not a fan of cheap storage because what most people think they are getting in savings they end up paying for in terms of management, performance and reliability. I don't care for SATA storage because I am not convinced that it will work reliably in the long run as opposed to SAS or Fibre Channel.

While the possibility of a massive failure for most cases is slight, it depends entirely on how the solution is deployed and what mechanisms are in place to protect the data. Having redundant storage to prevent data loss can get real expensive.

Edited 2009-09-18 15:33 UTC

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