Want to read Slashdot from your mobile device? Point it at m.slashdot.org and keep reading!

 


Forgot your password?
Close
typodupeerror

Comment Re:A couple of those-NVRAM is to speed up writes (Score 1) 359

The NVRAM cache on a RAID controller is meant to speed up random writes to a spinning disk. The speed up for most spinning disks is more than 20 times because seek speed hasn't significantly increased in 30 years. Yes, NVRAM doesn't help much for a SSD. I don't know what you mean by "your card". Most RAID controllers are available PCIe cards and run at full bus speed. PCIe x16 version 6 is 128GB/sec. You could make a software raid system that uses a NVMe M2 card as a write back cache but I'm not aware of software RAID that does this but it may be out there.

Comment Re:A couple of those-NVRAM is to speed up writes (Score 1) 359

You may be missing the purpose of NVRAM(Non-volatile or battery-backed-up ram) on a RAID card. The idea is during a write, the controller cannot correctly acknowledge the write until the data is committed to durable device like disk. This vastly slows down writing to disk. With NVRAM, as soon as the data is copied to NVRAM, you may acknowledge the write. Software raid cannot do this unless it has access to NVRAM. When power is restored, the writes still in NVRAM are committed to disk. This is critical for high-speed databases to maintain consistency.

Submission + - Electron Rocket Flies Again (space.com)

Submitted by XXongo
XXongo writes: Sometimes it seems that all the space news focuses on Space-X, but another private rocket company, Rocket Lab, is also making history with their bargain-basement space launcher, the Electron. The Electron booster just completed its seventh launch, this time carrying a satellite to the highest orbit yet, 1000 km. The launch carried the Astro Digital "Corvus" satellite. At 5.7 million dollars per launch, the company is the first of many space start-ups competing for the small-satellite launch business, a market too small to be of interest to the major launch companies like Space-X and United Launch Alliance.

To lower costs further, Rocket Lab has announced its intention to make their booster reusable-- with plans to capture Electron’s first stage in mid-air by helicopter.

Comment Impossible to regulate (Score 3, Insightful) 55

It amazes me that people believe that AI(Machine Learning) can be regulated. There is no hard to purchase component like plutonium for an atomic bomb. The code to do machine vision is available everywhere. It doesn't take special hardware, yes, a good GPU can speed up the training phase but strictly speaking, it's not necessary. Please let me know how someone intends to regulate such a thing.

Slashdot Top Deals

Assembly language experience is [important] for the maturity and understanding of how computers work that it provides. -- D. Gries

Close