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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Member since:2005-07-08
Budget does come into play. Our history with SATA storage here has not been a good one. We bought storage from a vendor that after six months decided to get out of the SATA storage game and dropped support for the devices. We now have over a hundred 500 GB SATA drives that we pulled from the arrays and junked the rest.
We also have SATA solutions from other vendors (NetApp, HP) and the jury is still out. Power, AC, and space do come into consideration but some of the people I work with also expect a level of performance that SATA might not meet, plus factor in the idea of using SATA over SCSI and FC makes some uncomfortable.
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.
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.
Member since:
2006-01-19
If your budget (in money, power, and space) is truly unlimited, you're right. But what if you can choose, say, mirrored SATA or parity raid fibre given the constraints at hand? What if you can choose SATA that is half full, versus fibre at 80% ? What if you can afford more SATA spindles? I don't think it is that clear cut given the normal constraints.