When were your WD20EADS HDDs manufactured?
Also, look at the newegg reviews: http://www.newegg.com/Product/Product.aspx?Item=N82E16822136344
Almost all of them are saying "highly unreliable", which just echos what I was saying earlier.
Also, those drives are desktop-class and do not feature TLER, so really, you are running a huge risk pushing those things in a hardware RAID array.
I'm glad its worked so long for you and hope it continues to do so.
But damn, you are running a huge risk.
Go with the Constellation drives, they are true nearline-class drives and are far more reliable in, and are designed for, hardware RAID.
I just ordered two Constellation ES HDDs for myself about 30 minutes ago for my server.
The Red drives, while they do have RAFF-like functionality and TLER, they are still just a desktop-class drive and do not have the robustness or full features like that of nearline-class drives.
Remember, high-performance /= reliability.
My WD20EADS do have TLER enabled, some of the later builds could not enable this. The failure rate of these drives does worry me though.
It is a costs vs reliability/warranty issue for me choosing between Reds and proper enterprise drives (SAS ones arent much more so if I did go proper nearline enterprise I would go for SAS). I've only got 4 bays left and although I have a spare chassis I would need to buy a SAS expander and a few other bits to use it as an expander chassis. Maybe I can hang on for 4TB SAS, event at £400 each they might be worth it.
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