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Comment by _wmd | Hacker News Reader

Probably a combination of lack of need until recently (125MB/sec is more than fine to saturate a classic disk), parts cost and power consumption.

I can't think of anything except connecting to a _fast_ SAN that would require a 10GBE port in a laptop. Maybe something specialized for a network engineer, but even then it's probably easier to buy dedicated equipment for line rate port monitoring

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The use case is high-def video editing, which people could do on laptops, and there are thunderbolt connections at that speed.

I found this:

http://www.fastestssd.com/featured/ssd-rankings-the-fastest-...

Pushing 3000MB/s, which is 3GB/s which should be times 8 for gigabits, I think it should be viable now, no?

Even a cheap $100-$200 SSD can do over 2Gbytes/sec these days: 256060514304 bytes (256 GB) copied, 95.4762 s, 2.7 GB/s

The M.2 interface has finally shrugged off the SATA bottleneck for commodity hardware. It's common on new motherboards, new laptops, and I recently read there's similar circuitry in the new iphone 6s.

> I can't think of anything except connecting to a _fast_ SAN that would require a 10GBE port in a laptop.

An off-the-shelf consumer raid-5 nas would require more than a gigabit port (so a 10 gig port would be needed).

A very cheap RAID5 setup with 4 spinning disks and a filesystem like ZFS or btrfs should get you about 3-500 MB/s, so 10 GbE is good for that setup on nodes.

The only way you're getting 3-500MB/s on a 4-disk ZFS RAID5/raidz is with very, very fast SSDs and a very, very fast CPU. Not exactly "very cheap". (The compute and I/O overhead for raidz is significant.)

Yep, i have some wd red 3tb drives in a raidz6 pool.

At best I can get 60m/s out of it. Each drive can do about 100m/s sequential but that is rare.

Putting an ssd on for caching read/writes though really changes the calculus of this.

This is... not my experience at all. I have a RAIDZ2 comprised of 6 4TB Seagate drives (the 5900RPM variety) and it can do about 600MBps read/write with moderate CPU usage on an Intel i3. A mirrored zpool of two Samsung 850 EVO SSDs can do nearly 1GBps read/write. That's not a particularly expensive setup.

600MB/s write over 6 drives in RAID-Z2 is very good on an i3.

zfs maybe not, but btrfs does it.

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