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Comment Re:Long-term, not short-term (Score 5, Informative) 172

We've been using SSDs in our servers since late 2008, starting with Fusion-io ioDrives and Intel drives since then - X25-E and X25-M, then 320, 520 and 710, and now planning to deploy a stack of S3700 and S3500 drives. Our main cluster of 10 servers has 24 SSDs each, we have another 40 drives on a dedicated search server, and smaller numbers elsewhere.

What we've found:

* Read performance is consistently brilliant. There's simply no going back.
* Random write performance on the 710 series is not great (compared to the SLC-based X25-E or ioDrives), and sustained random write performance on the mainstream drives isn't great either, but a single drive can still outperform a RAID-10 array of 15k rpm disks. The S3700 looks much better, but we haven't deployed them yet.
* SSDs can and do die without warning. One moment 100% good, next moment completely non-functional. Always use RAID if you love your data. (1, 10, 5, or 6, depending on your application.)
* Unlike disks, RAID-5 or 50 works pretty well for database workloads.
* We have noted the leading edge of the bathtub curve (infant mortality), but so far, no trailing edge as older drives start to wear out. Once in place, they just keep humming along.
* That said, we do match drives to workloads - SLC or enterprise MLC for random write loads (InnoDB, MongoDB) and MLC for sequential write/random read loads (TokuDB, CouchDB, Cassandra).

Comment Re:Get over the upgrading (Score 1) 464

Two years after buying this machine, Apple will release a newer version. The newer version will be so much better (faster bus, etc), that the older one will be left in the dust and on ebay for $499.

Three year old Mac Pro: Up to 12 cores, 64GB RAM.

Not even released yet Mac Pro: Up to 12 cores, 64GB RAM.

So... No.

Comment Re:I like it! It is a brillant design. (Score 1) 464

People don't seem to realize that Thunderbolt is external PCIe, it is not USB or Firewire or SATA. 6 ports gives you 6 PCIe 4x slots at 20Gbs which places it between PCIe 3 and 4

One PCIe 3 x16 slot is 128GT/s using 128b/130b encoding (i.e. data transfer can use >98% of the theoretical bandwidth). So ~126Gbps.

Six Thunderbolt 2 connectors are 6 x 20GT/s using 8b/10b encoding (80% efficient), so 96Gbps.

Comment Re:What could possibly go wrong? (Score 1) 103

They didn't use the gas directly; they dissolved it in water, at a concentration of 1 part per billion (ppb). 5ppb concentration in air is detectable by smell; 10 ppm, i.e. 10,000ppb, is the safety limit for extended exposure set by OSHA. So the concentrations used in the experiment are quite safe. That said, in higher concentrations it is seriously nasty.

Comment Make Mine A Double! (Score 1) 102

So, 4 cores at 2.5-3.5GHz, 384 shaders, and dual-channel DDR3-1866 RAM at 35W.

If AMD were to double everything they'd have a really nice 70W desktop chip. Not sure what the die size is for Richland, so a doubled chip might not be cost-effective - though the PS4 APU has 8 cores and 1152 shaders, so it's at least possible.

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