Linked by Thom Holwerda on Fri 18th Sep 2009 13:40 UTC, submitted by Robert Escue
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 â€" 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[5]: Henry's article is years behind the times
by Robert Escue on Mon 21st Sep 2009 21:12
in reply to "RE[4]: Henry's article is years behind the times"
Member since:2005-07-08
Our problem is the Government wants to build a SAN, but they want to use existing components that are in production (a bad idea) and I really don't think it sank in that mixing components is a good idea (we have 1 GB, 2 GB and 4 GB FC arrays and libraries). Our stuff is direct attach at the moment, which works but is not flexible.
Unfortunately this is what happens when you build something piecemeal and buy the key pieces (the FC switches) last.
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Member since:
2006-01-19
That's pretty bad. I guess it's kind of in line with what I mean though: SATA is just one piece of the puzzle. If the rest of the stack is junk, it almost doesn't matter what the drive interface is. From your other posts I think you are saying the same thing. I just wouldn't blame SATA, rather junky arrays.
Most of the server rooms I have worked in are near or over capacity for power and AC, but new ideas are usually the hardest sell.
True. It's kind of funny that by that mentality anybody would accept anything but direct attach storage. I mean, just because the SAN controller has fibre ports on both sides doesn't mean there isn't a very complicated black box in the middle. Thinking of it as "fibre from host to spindle" is sort of meaningless when there is no direct path from host to physical disk.