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 Raspberry Pi, Rm100 computer that beats iPhone4S

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spacelion
post Feb 17 2015, 03:21 PM

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QUOTE(Jon Ravenlocke @ Feb 13 2015, 12:12 PM)
Hello hello, I just bought a Raspberry Pi 2, thinking of learning to code. Any suggestions for a fun yet easy project for a total noob like me could start on? Thanks!
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dude, it's not an Arduino. it's a computer.
sarf2k4
post Feb 19 2015, 06:12 AM

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guys, i heard that raspi 2 has issues when it it got hit by camera flash, just watched a video and also read article about a week before, it will make ur raspi 2 frozen, i wonder if it will be affected by led flash and any other kind of flash or is it simply just a xenon flash type?

maybe shielding it with anything such as paper would protect it?
redlyfs
post Feb 19 2015, 01:54 PM

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If you read the reports then you know LED shouldn't effect it. It's not a big issue
sarf2k4
post Feb 20 2015, 07:33 AM

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but we r going to put it in a case also right, i guess that would protect it against xenon flash?

alucard89
post Feb 20 2015, 12:41 PM

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Just wanna ask, what's the best transfer speed you can get on raspberry nas? Particularly on rpi2

I've read some reviews that with RPI connected to gigabit Lan via USB to gigabit Lan adapter, you can get around 16Mbps
alucard89
post Feb 21 2015, 11:18 AM

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Alrite, just received the rpi2 today
I'd like to know how much space do I need to allocate for ext4 partition on the sdcard that's recommended?
Should it be 50% from the overall space? I'm using 32gb sdcard btw.
wcypierre
post Feb 21 2015, 12:20 PM

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QUOTE(alucard89 @ Feb 20 2015, 12:41 PM)
Just wanna ask, what's the best transfer speed you can get on raspberry nas? Particularly on rpi2

I've read some reviews that with RPI connected to gigabit Lan via USB to gigabit Lan adapter, you can get around 16Mbps
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I think you can go more than that with rpi2 as the review that you see was done with rpi model b. My rpi model B typically maxes out at around 8-9mBps with the built in 100 base T adapter(although, don't think too much because your sd card will be a bottleneck once you go over 100 mbps)

http://314256.blogspot.com/2014/05/raspber...t-ethernet.html

This post has been edited by wcypierre: Feb 21 2015, 12:27 PM
alucard89
post Feb 21 2015, 12:44 PM

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QUOTE(wcypierre @ Feb 21 2015, 12:20 PM)
I think you can go more than that with rpi2 as the review that you see was done with rpi model b. My rpi model B typically maxes out at around 8-9mBps with the built in 100 base T adapter(although, don't think too much because your sd card will be a bottleneck once you go over 100 mbps)

http://314256.blogspot.com/2014/05/raspber...t-ethernet.html
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Thanks for your input
Assuming I simply want to transfer a file to a hdd attached to rpi via samba/nfs share, would the sdcard still be a bottleneck?
Also, is that your blog?
I see the banana pi seems to have tremendous speed when transferring files over gigabit lan

http://314256.blogspot.com/2014/11/banana-...throughput.html
acbc
post Feb 21 2015, 12:46 PM

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I owned all 3 generations of Model B. My Pi2 Model B arrived this morning. Haven't found the time to power up.
wcypierre
post Feb 21 2015, 08:13 PM

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QUOTE(alucard89 @ Feb 21 2015, 12:44 PM)
Thanks for your input
Assuming I simply want to transfer a file to a hdd attached to rpi via samba/nfs share, would the sdcard still be a bottleneck?
Also, is that your blog?
I see the banana pi seems to have tremendous speed when transferring files over gigabit lan

http://314256.blogspot.com/2014/11/banana-...throughput.html
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Nope, it would be dependent on the speed of your hdd(which would be more than enough). Nope, it was just a blog that I found while googling.

Banana pi is faster because it uses a dedicated chip for the gigabit nic and usb 2.0. So there's no bus sharing resulting in loss of performance unlike all rpi generations where the usb 2.0 bus is shared by all usb devices and the internal nic. Not to mention that the banana pi has a powerful cpu compared to rpi(not particularly sure against rpi2 because I have not checked on that part).

p/s: to be honest, if you wanted to do file sharing via samba/nfs, may as well as get banana pi or banana pro instead sweat.gif
wcypierre
post Feb 21 2015, 08:14 PM

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QUOTE(acbc @ Feb 21 2015, 12:46 PM)
I owned all 3 generations of Model B. My Pi2 Model B arrived this morning. Haven't found the time to power up.
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what are you doing with them? brows.gif
acbc
post Feb 21 2015, 08:30 PM

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QUOTE(wcypierre @ Feb 21 2015, 08:14 PM)
what are you doing with them?  brows.gif
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No idea. The older Model B now as media player / server. B+ and 2 still in the box.
eric_tan
post Feb 21 2015, 10:31 PM

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QUOTE(cs2000 @ Feb 17 2015, 01:50 PM)
i solved mine by changing the micro USB cable. apparently it needs those thick original cables. the aftermarket thin ones doesnt power it up.
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I had very similar issues when I received my Pi B+ in July 2014.
Rule of Thumb: Use branded cables that came with your branded charger (phone/tablet). All pasar malam cables are only as good as 5V@0.5A.

You can read about my blog post about cables and charges here.


QUOTE(alucard89 @ Feb 20 2015, 12:41 PM)
Just wanna ask, what's the best transfer speed you can get on raspberry nas? Particularly on rpi2

I've read some reviews that with RPI connected to gigabit Lan via USB to gigabit Lan adapter, you can get around 16Mbps
*
I did a test on the Pi 2 vs Pi B+ when I received my unit. You can read about it here.

Honestly, for that price of a Pi 2 + SD Card + Case + Good PSU (at least RM200 ~ 250), you might as well buy a purpose made NAS.

I am currently using the D-Link DNS-327L, which is about RM400 (I think), and on GB Lan, I can get about 50~60MB writes and 40~50MB reads.
Sorry no blog post, but use it on the daily basis to move files between PC & NAS

But the Pi as Media Centre, Media Storage device & Torrent machine is great at that price point!
alucard89
post Feb 22 2015, 01:05 PM

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QUOTE(wcypierre @ Feb 21 2015, 08:13 PM)
Nope, it would be dependent on the speed of your hdd(which would be more than enough). Nope, it was just a blog that I found while googling.

Banana pi is faster because it uses a dedicated chip for the gigabit nic and usb 2.0. So there's no bus sharing resulting in loss of performance unlike all rpi generations where the usb 2.0 bus is shared by all usb devices and the internal nic. Not to mention that the banana pi has a powerful cpu compared to rpi(not particularly sure against rpi2 because I have not checked on that part).

p/s: to be honest, if you wanted to do file sharing via samba/nfs, may as well as get banana pi or banana pro instead  sweat.gif
*
Banana pi is definitely quite interesting, from what I read so far, it's not that great for media player but suits well for other purposes
I'm just quite unsure about the development for banana pi and I don't see too many people using it here
But with the sata port, I wonder if it supports sata ports multiplier to attach more hdds.

Btw, just tried openelec on RPi2, and the performance is really great so far, no buffering when watching movies or crashes.
Everything is smooth when running on heavy skin like Aeon NOX, I actually bought IR receiver with remote for the rpi but the hdmi cec feature seems sufficient since I'm able to use the tv remote to control Kodi UI. I notice there's only shutdown option once the timer is up, no sleep option.
Is it better to just leave the RPI2 online all the time?
wcypierre
post Feb 22 2015, 01:21 PM

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QUOTE(alucard89 @ Feb 22 2015, 01:05 PM)
Banana pi is definitely quite interesting, from what I read so far, it's not that great for media player but suits well for other purposes
I'm just quite unsure about the development for banana pi and I don't see too many people using it here
But with the sata port, I wonder if it supports sata ports multiplier to attach more hdds.

Btw, just tried openelec on RPi2, and the performance is really great so far, no buffering when watching movies or crashes.
Everything is smooth when running on heavy skin like Aeon NOX, I actually bought  IR receiver with remote for the rpi but the hdmi cec feature seems sufficient since I'm able to use the tv remote to control Kodi UI. I notice there's only shutdown option once the timer is up, no sleep option.
Is it better to just leave the RPI2 online all the time?
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you don't really need bleeding edge updates though, although device support is important(like to support the IR receiver that you're using).

just leave it on. I have 3 rpi + 1 desktop running 24/7 at my room sweat.gif shakehead.gif shakehead.gif shakehead.gif
alucard89
post Feb 22 2015, 01:32 PM

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QUOTE(eric_tan @ Feb 21 2015, 10:31 PM)
I had very similar issues when I received my Pi B+ in July 2014.
Rule of Thumb: Use branded cables that came with your branded charger (phone/tablet). All pasar malam cables are only as good as 5V@0.5A.

You can read about my blog post about cables and charges here.
I did a test on the Pi 2 vs Pi B+ when I received my unit. You can read about it here.

Honestly, for that price of a Pi 2 + SD Card + Case + Good PSU (at least RM200 ~ 250), you might as well buy a purpose made NAS.

I am currently using the D-Link DNS-327L, which is about RM400 (I think), and on GB Lan, I can get about 50~60MB writes and 40~50MB reads.
Sorry no blog post, but use it on the daily basis to move files between PC & NAS

But the Pi as Media Centre, Media Storage device & Torrent machine is great at that price point!
*
Thanks for speed test, I guess you just won't get much speed even on GB lan with RPI,
I wonder if they'll include gigabit lan for the next rPI

I guess the reason I never bothered to use commercial nas it because they always require the HDD to be formatted in ext4 partition when most of my hdds are in NTFS and already filled with bunch of stuff that I'm just too lazy to backup elsewhere sweat.gif

Btw, for file extraction particularly with rar files, how long will it take to extract huge files with rpi2? Say around 1gb files
alucard89
post Feb 22 2015, 01:34 PM

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QUOTE(wcypierre @ Feb 22 2015, 01:21 PM)
you don't really need bleeding edge updates though, although device support is important(like to support the IR receiver that you're using).

just leave it on. I have 3 rpi + 1 desktop running 24/7 at my room  sweat.gif  shakehead.gif  shakehead.gif  shakehead.gif
*
Got no overheating problem with RPI? Or do you place it near a fan or something
I saw some casing that provides heatsink as well
wcypierre
post Feb 22 2015, 01:36 PM

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QUOTE(alucard89 @ Feb 22 2015, 01:32 PM)
I wonder if they'll include gigabit lan for the next rPI
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it depends on their next soc actually, because processor, ram, usb is built into the soc so we will just have to wait until the prices of more powerful soc becomes more affordable
wcypierre
post Feb 22 2015, 01:39 PM

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QUOTE(alucard89 @ Feb 22 2015, 01:34 PM)
Got no overheating problem with RPI? Or do you place it near a fan or something
I saw some casing that provides heatsink as well
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I do place heatsink on one of my rpi which does the torrent downloading. The others are just for media streaming. I'm planning to build a diy cooling system for my rpis and desktop but I guess it will have to wait after cny
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post Feb 22 2015, 08:49 PM

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FYI, Thundermatch Lowyat has the RPI 2 going for RM159. Purely as a matter of convenience and instant gratification.

I didn't buy one though, thinking of getting Odroid C1 for Android.

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