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Pros: Tremendous price / performance ratio.
Our company needed a low cost, but high performance Hadoop & Hbase cluster to run Cloudera's CDH4 on. We used these with Supermicro boards and Kingston RAM, in 1U Supermicro chassis. Such a great bang for your buck in this, especially with all those tasty threads. Great for MR jobs, and serving Hbase data to customers through our API.
Energy efficiency is great, we're using high quality power supplies, and low voltage RAM. Even at full tilt these things are sipping power compared to the older Xeon 5600 series.
Cons: Really, none for what you're getting.
Other Thoughts: I was so impressed that I bought one of these for my home desktop, along with a 680 graphics card. Jacked up the graphics settings in Fallout NV, Hitman Absolution, and Far Cry 3 to their highest at 1900x1200 on a 24" Dell IPS screen, a thing of beauty! I should hook my 54" tv up next.. hmmREAD FULL REVIEW
Pros: Fast. smartd / smartctl work nicely in linux for monitoring drive health on numerous systems.
Cons: Prior to RHEL / CentOS 6.3 drivers were a nightmare.
Other Thoughts: My previous review was harsh and well deserved. Drivers finally showed up as native in the 6.3 release, seamless now. I've got a bunch of these in VM hosts with 8/16 core opterons and WD raptor drives in raid 10. Very fast and consistent.READ FULL REVIEW
Pros: Low cost, snappy and reliable, excellent warranty
Cons: SATA 6Gb/s would be great
Other Thoughts: I've been running these in a proof-of-concept Hadoop cluster with Core i3 processors on 5 nodes. Mostly using Hbase to store a lot of telemetry data. Occasionally running some map reduce jobs.
They're not the most amazing but they have yet to fail in a running machine. I pulled a few out of a server and had 2 go bad when I tried to bring it back online in a new location. That's out of 25 or so drives, excellent.
We'll be switching to a 2.5" form factor drive to increase density in production, sorry to see these great drives go.