91–100 of 112 posts
A2 needs support in the Linux kernel. It's not there, yet. https://github.com/ThomasKaiser/Knowledge/blob/master/articl... "A2 promises even better performance with 4000/2000 read/write IOPS minimum but there's a problem since as outlined by the SD Association A2 cards show "much higher performance than A1 performance by using functions of Command Queuing and Cache". Cache and Command Queuing require host (driver) su…
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So is there any kind of device able to use A2 cards at the rated performance yet? I can't get anything better on my Mac with multiple readers (USB 3.0 and 3.1), and I'm guessing if I tried on the reader in my 1 year old Dell XPS, I'd get the same. What good is a performance designation (A2) if no device in the real world supports it?
I don't know. It's a bit of a bummer. I imagine Android would benefit the most (and phones also don't suffer from sudden power outages, which is the biggest risk with enabling this), so someone may try looking if mmc core in androind kernel has patches to support this.
Phone batteries die, and the battery remaining percentages are only an estimate so writing code to react to that condition can be fickle.
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That is just not true. I have burned through many a RPi SD card in 3-6 months, while phone batteries last 2 years at minimum.
What cards are you using? I have three RPis in abusive conditions, and they haven't had a single SD card issue. Two RPi 3b's running as a car entertainment system, with no form of battery backup/safe shutdown. They are on the ignition power, and once the car turns off, they hard shut down. These have been in place for nearly 2 years with the same Samsung Evo 16GB cards. The other is attached to a digital signage with…
The failed ones were all running media servers with actual media storage on external drives, but indexing done on the SD card.
I ended up aggressively moving write loads to external storage and most of my RPis are running with read-only mounted SD cards these days.
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Also how ISP speed is measured ;)
Advertised, not measured. And it's not like that everywhere, the UK has started what I hope develops into a trend: https://www.bt.com/broadband/deals/
What you'll actually get is determined by factors entirely out of their control. Whether that's an install engineer using a reel of Cat5e because that's what was in the truck even though the work order said crappy Category 3 phone cable would do, or even the neighbours are all using the most expensive package and that causes electrical interference that reduces everybody's bandwidth.
You can measure your actual characteristics, and the ISP will offer to do a half decent estimate of that, that's useful to at least decide which service to buy but the average is essentially worthless.
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Also how ISP speed is measured ;)
Advertised, not measured. And it's not like that everywhere, the UK has started what I hope develops into a trend: https://www.bt.com/broadband/deals/
If the UK had deployed fit-for-purpose tech like Fibre-To-The-Home (FTTH), there would be much less need for the UK's advertising regulations. (Obviously speeds are never guaranteed on residential connections, but advertised fibre speeds are a much more accurate predictor of internet experience than DSL or cable.)
"But", you might say, "that BT page is advertising 'Superfast Fibre'!". Well, yes, in the UK it is legal for telcos to lie to their customers. When they say fibre, they mean Fibre-To-The-Cabinet - and VDSL the rest of the way. Would anyone call their 3G mobile service "Superfast Fibre" because the tower is fibre-fed? No. For whatever reason, though, this is totally okay in the UK.
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> What good is a performance designation (A2) if no device in the real world supports it? this is often the case for new hardware specs/protocols.. see also: any SATA/SCSI rev N+1, TCQ/NCQ, UASP, PCI n+1, etc.
But in all those cases (I have used most of them), there was _some_ way a consumer could acquire hardware (and drivers) to use the tech. It might've been expensive, but I could go out and buy an SATA card, or SCSI 2, or whatever. With A2, so far I have not seen any way any consumer (or anyone, really) could achieve 2000/4000 IOPS. That would be like selling a SATA 2400 drive for 2x the cost of an SATA 600 drive... bu…
Spec/code is open. I'm just sort of surprised noone tried it yet.
How about lifespan? I fail to understand why SD card have such a short lifespan, and it's the sole reason I won't acquire an RPi. It seems that the only think that is lacking on RPi is flash memory storage. Most smartphones have a lot of it, and it seems that 1GB of storage would be enough for the RPi and would not necessarily be so expensive.
FWIW, only noname and Sandisk cards have given up the ghost on me. Samsung Pro & Evo cards have been doing just fine. Other than that, you just need to worry about getting proper power. Just use the official power supplies, and you're fine. Also eMMC chips are no magic. There are crappy ones and good ones. Guess which ones you're going to get for little money?
My most recent additions are a Samsung Evo card and a Samsung Endurance. I am curious to see which dies first.
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That is just not true. I have burned through many a RPi SD card in 3-6 months, while phone batteries last 2 years at minimum.
What cards are you using? I have three RPis in abusive conditions, and they haven't had a single SD card issue. Two RPi 3b's running as a car entertainment system, with no form of battery backup/safe shutdown. They are on the ignition power, and once the car turns off, they hard shut down. These have been in place for nearly 2 years with the same Samsung Evo 16GB cards. The other is attached to a digital signage with…
The cards that die quickest for me are either written excessively like a GoPro or Pi based data loggers written constantly. The GoPros are just burning out the cards but the data loggers corrupt the disk images during unexpected power loss.
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Advertised, not measured. And it's not like that everywhere, the UK has started what I hope develops into a trend: https://www.bt.com/broadband/deals/
The UK has to do that because the fastest widely-deployed internet connections available are VDSL2. DSL connections in general are relatively unreliable, and speeds vary wildly depending on a variety of factors, most importantly the length of the cable between you and your cabinet/exchange. Australian folks may chime in here with tales of their DSL connections dropping out during heavy rain, when their telephone junc…