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Comment SanDisk sells a 512TB 3U shelf... (Score 2) 217 217

SanDisk's Infiniflash is 512TB in a 3U chassis that is SAS-connected. You can front this with something like DataCore's SANsymphony to turn it into a NAS/SAN appliance.

The pricing looks to be around $1/GB, which is a ton cheaper than building a SAN of that capacity, plus it's much smaller in power/space/cooling.

Comment Re:Use purple-facebook (Score 1) 63 63

Aah, managed to download this plugin and get it working. It connects to a different server than chat.facebook.com as well.

I've noticed in the comments that some folks can still use xmpp with chat.facebook.com, but whatever local server that DNS is pointing me at is no longer accepting connections.

Thanks.

Submission + - Facebook Finally Ends XMPP Support For 3rd Party Chat.

AcquaCow writes: Facebook has been pushing their Messenger app to all devices, requiring it for chatting with friends and family. It was announced last year that they would be ending their chat API and that the service would end on April 30, 2015. April passed, so did May, but the serviced remained functional. Finally, as of July 7th, 2015 it has not been possible to connect to chat.facebook.com. This doesn't seem to be an outage at this point...Looks like we have to wait for 3rd party messenger apps to adopt support for Facebook's Platform API v2 to allow new connectivity.

Comment Charge trap vs floating gate NAND... (Score 4, Interesting) 184 184

Newer 3D NAND is using a charge trap design which basically solves the electron leakage issue found with the older floating gate NAND...

Also, the move to the newer 3D NAND brings us back up to 40nm processes vs the 10nm gates we are currently working with, allowing for much better reliability.

Disclaimer: I've been selling enterprise flash storage for the last 6 years.

Comment Re:that can't be true (Score 1) 162 162

You can't read game files faster because the process that reads the game file is single threaded vs multi-threaded... so it can only read as fast as a single thread can read.

A fully saturated CPU has enough lanes to do about 26-28GB/sec, but a single I/O thread might only be able to do 100-200MB/sec.

There was never any reason in the OS before today to make that any faster because the spinning disks that fed data to the CPUs couldn't do more than 100MB/sec.

Now that we have all this great flash, code needs to be re-written to be able to use other idle CPU time to spin up more threads and read the data faster.

Comment Re:ISTR hearing something about that... (Score 1) 162 162

It's worth remembering that 98k IOPS will be at a very small block size and will rapidly drop as you increase block size to 4K-1MB as the larger transfer size will directly equate to less I/O.

The real problem is that apps are not written for multi-threaded I/O which is what you really need in order to take advantage of the throughput provided by PCI-e flash.

Comment Re:It all depends on the workload... (Score 1) 162 162

Booting from RAID is more supported, and the support is baked into nearly every BIOS out there... booting PCI-e over NVMe or UEFI is brand new and very few things support it and all the code is new.

Booting through a raid card that has it's own BIOS is nothing like booting off of a native PCI-e device.

Comment Re:It all depends on the workload... (Score 1) 162 162

Booting from pci-e uses either a UEFI driver or NVMe today, two technologies that are kinda in their infancy.

The code is not yet fully optimized/etc and you may see reduced speeds at least until you can get into an OS layer and load up a more feature-full driver.

Comment Re:"old sata drives"? (Score 1) 162 162

The PCI-e native SSDs are indeed faster, the problem is, the code reading data off of them (your application/os) isn't written to take advantage of the increased speeds. Single threaded reads cap out at the read speed of a single thread, and that isn't that fast. This is especially true if they are 4K reads vs 1M reads, as you aren't going to saturate anything until you get up into larger read sizes.

To really take advantage of the bandwidth SSDs enable, you need to be running multiple parallel apps running multiple reads, or you need an app that can do multi-threaded reads.

Comment Re:SSDs (Score 2) 162 162

This is because you get stuck leaving the CPU to handle all the context switching between virtual block storage in DRAM and memory. The CPU has to copy data out of block and into memory before it can actually use it, so by making a ram disk you end up giving the CPU 2-4x the amount of work to do for what should be a DMA read/write, which would normally be offloaded.

Also, your reads from your game are going to be single-threaded, and a single read/write thread is going to be pretty slow.

Comment Re:We don't need density! We need longer life! (Score 1) 42 42

There's no reason to use SLC these days really... Once you start writing in large density with intent on retaining data for some period of time, you'll be striping that data across 10-100 SSDs... The combined wear-life even with cheaper MLC drives still puts you up over 100 years for most products.

It's pretty easy to take the Drive Writes Per Day (DWPD) or PetaBytes Written (PBW) for the drives and add them all up... most any install will 10+ drives will outlast any standard 5 year hardware refresh cycle.

Disclaimer: I work for a large flash company and have been selling this stuff for the last 5 years.

-- Dave

Comment Technically, it will deliver less air... (Score 1) 287 287

You don't want to just cut fuel with the same air intake... then you just run lean and ruin the motor with detonation.

The car simply closes the butterfly valve, cutting air, and thus cutting fuel as a result of less metered air in the plenum.

-- Dave

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