Go to advanced search

by rew
Fri Jul 05, 2019 9:14 am
Forum: Raspbian
Topic: 64-bit kernel (option?)
Replies: 6
Views: 396

Re: 64-bit kernel (option?)

Although "having speed" is also important for a big storage module, some applications can use storage with a speed between the old-fashioned "tape" and "modern, quick harddrive". The way I understand it is that "raspbian-management" has decided against moving raspbian to 64-bit. I respect that choic...
by rew
Thu Jul 04, 2019 2:57 pm
Forum: Raspbian
Topic: 64-bit kernel (option?)
Replies: 6
Views: 396

Re: 64-bit kernel (option?)

I have another pi, What are you suggesting I do with that? If I split my drives across two raspberries, the overhead of RAID5 (now 20%) will go up (40%). But the whole idea is to have a BIG space where I can store stuff I don't need often, but in one place so that I don't' have to move data between ...
by rew
Thu Jul 04, 2019 12:52 pm
Forum: Raspbian
Topic: 64-bit kernel (option?)
Replies: 6
Views: 396

64-bit kernel (option?)

To handle a bunch of "big-slow" storage I have decided that hte PI4 is "up to the job". At 200MB/sec disk IO and maybe 30-50 MB/sec for ethernet, it isn't even all that slow. For this I really need a 64-bit kernel: It seems 32-bit kernels do not play nice above 16T of storage. My main file-server he...
by rew
Wed Jul 03, 2019 7:25 pm
Forum: General discussion
Topic: Recommended filesystem for large partition?
Replies: 8
Views: 204

Re: Recommended filesystem for large partition?

Got the pi-3 up-and-running. XFS. Zfs didn't have kernel-support installed. The bottleneck in copying the data from the old location seems to be the 100mbps ethernet. The disks are plenty-fast at 20Mbyte per second compared to that.... I expect the pi-4 Ubuntu support will be available before the rs...
by rew
Wed Jul 03, 2019 6:39 pm
Forum: General discussion
Topic: Recommended filesystem for large partition?
Replies: 8
Views: 204

Re: Recommended filesystem for large partition?

I pulled a RPI-3 out of the closet. So now I'm going to have 32Tb of storage connected through a 30Mbyte/sec USB2 connection....

The foundation seems to have made a conscious choice not to go 64-bits. So I'm not expecting them to "fix" that soon. I would hope that Ubuntu will go pi-4 soon-ish?
by rew
Wed Jul 03, 2019 5:32 pm
Forum: General discussion
Topic: Recommended filesystem for large partition?
Replies: 8
Views: 204

Re: Recommended filesystem for large partition?

Yeah. It seems that md allows a unit this large, but everything else needs less than 16Tb. It took me a while to start to grok all the 16 Tibibybytes in the documentation. I bough 8TB drives, I have a 32TB Anway. Enough rant. I tried partitioning the drive with GPT into two halves. That dosn't work....
by rew
Wed Jul 03, 2019 4:59 pm
Forum: General discussion
Topic: Recommended filesystem for large partition?
Replies: 8
Views: 204

Recommended filesystem for large partition?

Hi, I've created a big raid5 disk on my new pi 4. anticlimax:/home/wolff# cat /proc/mdstat md0 : active raid5 sde1[5] sdd1[3] sdc1[2] sdb1[1] sda1[0] 31255572480 blocks super 1.2 level 5, 512k chunk, algorithm 2 [5/5] [UUUUU] [/code when I run: ] [code]mkfs.ext4 /dev/md4 it reports: Attempt to read ...
by rew
Tue May 07, 2019 3:41 pm
Forum: Compute Module
Topic: Two LAN9514 chips on one raspberry.
Replies: 5
Views: 595

Re: Two LAN9514 chips on one raspberry.

Yes. I need the lan ports and get the "hub" part for free. I could've maybe tried another USB-lan chip, but 1) this one works on the raspberry 2) I need at least one hub anyway. (I would've gotten by with a bare usb-ethernet chip and a LAN9512, but the complexity of two different chips is not worth ...
by rew
Sun May 05, 2019 12:23 pm
Forum: General discussion
Topic: Seeking suggestions on reusing an old tablet touch screen
Replies: 7
Views: 532

Re: Seeking suggestions on reusing an old tablet touch screen

There are very many different possible screen interface specifications. The chip on the raspberry pi can do a few of them and many screens will support one or two. The chances that those will match are slim. When a phone or tablet manufacturer designs a new phone-or-tablet, they will search the poss...
by rew
Sun May 05, 2019 12:16 pm
Forum: Compute Module
Topic: Two LAN9514 chips on one raspberry.
Replies: 5
Views: 595

Two LAN9514 chips on one raspberry.

I have a project where one Compute module (CM3) gets connected to two LAN9514 chips for Ethernet connectivity. It seems that the raspberry pi uses the last 3 bytes of its serial number for the MAC on the LAN chips. That's all nice if you have one of them, but I'd say it is not allowed when there are...
by rew
Fri Dec 28, 2018 5:18 pm
Forum: Graphics, sound and multimedia
Topic: Is Openscad ported to Raspbian Stretch?
Replies: 20
Views: 5531

Re: Is Openscad ported to Raspbian Stretch?

that I had was with finding the repository file 'libqscintilla2_qt4.so.13'. This was what his compiled copy of openscad was asking for. We found the file 'libqscintilla2_qt4.so.13.1.1', but as I said, that is not what the compiled openscad was asking for. Ah! But that one is easy if you know how th...
by rew
Wed Dec 19, 2018 2:10 pm
Forum: General discussion
Topic: pi one still supported?
Replies: 17
Views: 1105

Re: pi one still supported?

Yes, I buy the Micro SD cards with adapter. So I now have plenty of adapters around to put the microSD into the original pi. The goal is to have my scanner connected and I had just hooked that up when the troubles started. Maybe the printer is outputting 12V on the VUSB? Nope. 0V. And the scanner is...
by rew
Tue Dec 18, 2018 6:12 pm
Forum: General discussion
Topic: pi one still supported?
Replies: 17
Views: 1105

pi one still supported?

Hi, Is the original PI still supported? I need a "linux computer with USB and ethernet" and even a PI one would be overkill. So I thought I'd use the old pi that is collecting dust somewhere for this application, but somewhere in the process it suddenly died. And I got another pi one from the pile a...
by rew
Mon Jun 18, 2018 2:53 pm
Forum: Troubleshooting
Topic: Hooking up official 7 inch display to CMIO with Compute module 3
Replies: 7
Views: 864

Re: Hooking up official 7 inch display to CMIO with Compute module 3

You've probably solved it by now (or not).... but...

You have the FPC on the display side upside-down. The blue stuff needs to go towards the PCB. The contacts are AWAY from the PCB.
by rew
Fri Jun 01, 2018 11:29 am
Forum: Compute Module
Topic: 13 seconds boot delay
Replies: 4
Views: 2478

Re: 13 seconds boot delay

I think this can be easily fixed in the firmware: https://github.com/raspberrypi/firmware/issues/1002
(My PCB is crowded enough as it is).
by rew
Fri Nov 18, 2016 4:43 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Serial port "noise".
Replies: 3
Views: 1323

Re: Serial port "noise".

Scotty101: Thanks! That's it!

I was starting to look for the "Send this string to uart" code in the kernel and compiling my own kernel, but just extracting the uncompressed kernel from the distributed kernel.img is easier.
by rew
Fri Nov 18, 2016 12:05 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Serial port "noise".
Replies: 3
Views: 1323

Serial port "noise".

I have "stuff" connected to my UART. It does funny things when it gets sent "random" data. I see "Uncompressing " at 115200baud, then "Linux..." at around 1800kbps and 0.31 seconds later "done...\r\n" (still at 1.8Mbaud). Is there a way to prevent this output? I have: dtoverlay=pi3-disable-bt in boo...
by rew
Sun Jul 10, 2016 2:10 pm
Forum: Troubleshooting
Topic: ttyAMA0 returns EOF.
Replies: 1
Views: 554

ttyAMA0 returns EOF.

I have a "smart meter" connected to my pi (zero). I want to log the data to a mysql database, but until then I want to log the raw output to a file... cat /dev/ttyAMA0 >> thelogfile.log that should do the trick. (besides setting the baud rate). I've configured my pi not to do serial console. There i...
by rew
Sat Mar 26, 2016 6:38 pm
Forum: General discussion
Topic: Interaction setting the font and changing the resolution?
Replies: 0
Views: 400

Interaction setting the font and changing the resolution?

A friend has a pi, that was used with a TV. i.e. a lot of pixels but you tend to sit a long distance away. So I increased the console fontsize. Now she bought a small display. When setting the display mode using "tvservice" , the screen always blanks, and never comes back. Could it be that changing ...
by rew
Sat Mar 26, 2016 6:33 pm
Forum: General discussion
Topic: How reliable is the Raspberry Pi 3
Replies: 19
Views: 9721

Re: How reliable is the Raspberry Pi 3

Using the compute module is IMHO only advised if you really need 'pi compatiblity and price is of no concern.
by rew
Tue Mar 01, 2016 2:10 pm
Forum: Beginners
Topic: PI 3 and Raspbian Wheezy
Replies: 48
Views: 42349

Re: PI 3 and Raspbian Wheezy

you may get away with sudo apt-get update && sudo apt-get dist-upgrade sudo rpi-update sudo reboot So far I can report that this does NOT work. I just get the rainbow square. The green led sends MORSE: - - - - . . . . (dash dash dash dash dot dot dot dot (pause) ) UPDATE: I thought I had upgraded t...
by rew
Tue Dec 15, 2015 5:57 pm
Forum: General discussion
Topic: Adding more RAM - presumably impossible?
Replies: 84
Views: 22533

Re: Adding more RAM - presumably impossible?

It's quite possible that SD cards can claim 40Mbyte per second or even more, but certain restrictions in the interface between the processor and the SD card mean that the pi cannot use the fastest communication method with modern SD cards. With a 32-bit bus and 900 M transfers per second, the DDR on...
by rew
Tue Dec 15, 2015 9:59 am
Forum: Raspbian
Topic: Calling a script when WIFI attaches.
Replies: 2
Views: 1188

Re: Calling a script when WIFI attaches.

Thanks Dougie. I thought: let's look in the source where that file (or a pointer to it) gets stored, but as far as I can tell, this command will attach to wpa-supplicant and then wait for the event to happen and execute the script whenever it happens. That would mean I'd have to put it in a startup ...
by rew
Mon Dec 14, 2015 11:35 am
Forum: Raspbian
Topic: Calling a script when WIFI attaches.
Replies: 2
Views: 1188

Calling a script when WIFI attaches.

Hi, I've mounted a "zero" on my bike. I want it to connect to my home- and work-wifi when I get there. That works. But I also want to trigger running a script to synchronize things: upload the measurements that it has taken over the trip. Everybody suggests that I use an "post-up" script. This works...
by rew
Mon Dec 14, 2015 11:27 am
Forum: Raspbian
Topic: Lite faster than Full version?
Replies: 4
Views: 2818

Re: Lite faster than Full version?

The main reason for "lite" is that it is meant as "non desktop" so there are less files to download and install. It is a good starting point for a server, the non-lite for when you want to use it as a workstation.

Go to advanced search