Emulex,
>just remember cheap drives = unreliable.
>
>There is a reason there are RE3/RE4 WD, Enterprise hitachi sata, >Seagate NS/ES, Constellation.
>
>even those fail way more often than normal sas drives. you get >what you pay for and huge amounts of unreliable storage is
>worth $0.00.
In my experience (I'd say a medium-sized sample set), the "nearline enterprise" SATA/SAS drives are not more reliable than the desktop SATA drives after you've weeded out DOAs and infant deaths. The main actual difference I see between the desktop drives and the nearline drives is that the latter are supposed to be 100% tested at the factory, while the former's testing is only on a small sampled portion of the production run. I always, ALWAYS put drives through a decent workload of diagnostics before putting them into production, and that weeds a decent number of DOA/infant deaths out. Considering that I always test anyway, the DOA+infant death rate on nearlines does not justify the delta cost in my opinion. I just buy more of the desktop drives and expect to throw some away, and come out ahead vs. paying for the "nearline" version. Note that WD at least is now crippling the firmware in the desktop drives when it comes to RAID-useful features, just to segment more. Way to lose my business back to Seagate, WD
Real, ground up SAS drives do appear to be a tier better in reliability, and they sure are in IOPS kind of performance.