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by sudhir_brahma
Wed Jul 04, 2018 5:36 am
Forum: Advanced users
Topic: Pi zero W: Heat tests. It looks like it is a rugged module afterall
Replies: 0
Views: 272

Pi zero W: Heat tests. It looks like it is a rugged module afterall

So I decided to test the Pi0-W at elevated temperatures and boy - did it surprise me with its ruggedness......!!! Setup: 1. Pi0-W, Rasbian Lite, Sysbench run with "sysbench --test=cpu --cpu-max-prime=200000 run"...put that in while1 loop in case it exists Why that test: CPU is pushed to between 90%-...
by sudhir_brahma
Wed Jun 13, 2018 12:14 pm
Forum: Advanced users
Topic: Need a sure shot tested way to corrupt the root filesystem
Replies: 9
Views: 1068

Re: Need a sure shot tested way to corrupt the root filesystem

Started copying large files (video) into various directories, including /etc; /var/logs; /home and pulling the plug when the green led is lit (IO to sd happening). It's not clear what you are trying to do. To me it appears you are trying to corrupt the FAT32 partition of the card by writing to thin...
by sudhir_brahma
Wed Jun 13, 2018 12:47 am
Forum: Advanced users
Topic: Need a sure shot tested way to corrupt the root filesystem
Replies: 9
Views: 1068

Re: Need a sure shot tested way to corrupt the root filesystem

You could try removing the journal from the filesystem. That might make corruption a bit easier: tune2fs -O ^has_journal /dev/mmcblk0p1 Thank you Justin. The mmcblk0p1 is the boot partition of type fat32, which is non journaling any way. Yes you are right earlier, when I did the tests without unmou...
by sudhir_brahma
Tue Jun 12, 2018 4:10 pm
Forum: Advanced users
Topic: Need a sure shot tested way to corrupt the root filesystem
Replies: 9
Views: 1068

Re: Need a sure shot tested way to corrupt the root filesystem

Start a long running process writing a file one byte at a time with a short delay between writes. Every 4K bytes fflush() the buffer. Thank you Sir. I have a folder in my Rpi3 that has 6 files each of 50 MB and I am copying all of them to /etc or to /var/logs or to /home While that is in progress, ...
by sudhir_brahma
Tue Jun 12, 2018 3:28 pm
Forum: Advanced users
Topic: Turning off power on a PI Zero W
Replies: 6
Views: 1520

Re: Turning off power on a PI Zero W

I have a reverse problem: I am trying to corrupt my Root file system, with a power plug pull, but it just would not- the system comes back just fine Details of my changes and other details here https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=215809 May be u can try those changes too (they ar...
by sudhir_brahma
Tue Jun 12, 2018 3:13 pm
Forum: Advanced users
Topic: Need a sure shot tested way to corrupt the root filesystem
Replies: 9
Views: 1068

Need a sure shot tested way to corrupt the root filesystem

Update on June 13, 2018: Thank you all for reviewing my post and yr suggestions. I think I have finally found that the FS is indeed silently corrupted: I found that today when trying to run the 'clear' command and it returned with a '-bash: clear: command not found'; then I tried 'apt-get update'. T...
by sudhir_brahma
Sun Mar 05, 2017 2:07 am
Forum: Advanced users
Topic: STICKY: HOWTO: Move the filesystem to a USB stick/Drive
Replies: 339
Views: 518961

Re: HOWTO: Move the filesystem to a USB stick/Drive [updated

I am unsure if partitioning of a flash drive - USB or micro SD into 2 partitions is the cause of unreliability we see in RPI in the first place. I would recommend having the preboot still on the microsd
by sudhir_brahma
Sat Mar 04, 2017 1:45 am
Forum: Advanced users
Topic: STICKY: HOWTO: Move the filesystem to a USB stick/Drive
Replies: 339
Views: 518961

Re: HOWTO: Move the filesystem to a USB stick/Drive [updated

I have noticed that a SD card reader (USB) works faster- its a USB2 card reader from SanDisk. I suppose since USB3 is backward compatible with USB2, atleast its speed will be 'good enough' or not be a bottleneck. I have ordered for a Quantum USB3 SD card reader to experiment. I must caution readers ...
by sudhir_brahma
Thu Mar 02, 2017 12:03 am
Forum: Advanced users
Topic: STICKY: HOWTO: Move the filesystem to a USB stick/Drive
Replies: 339
Views: 518961

Re: HOWTO: Move the filesystem to a USB stick/Drive [updated

I had a similar issue. Traced it to a slow USB drive. Changed it to a faster one now all ok.
by sudhir_brahma
Wed Dec 28, 2016 1:29 pm
Forum: Graphics, sound and multimedia
Topic: ffmpeg too slow
Replies: 4
Views: 2446

Re: ffmpeg too slow

Thank you jamesh & 6by 9. 1. May be what I see by way of ffmpeg performance is as expected? This is assuming I am doing it all in software (no hw acceleration). I reduced the sampling rate for generating the output and got a further improvement of about 5 seconds. I used the "-r" option. The new com...
by sudhir_brahma
Fri Dec 23, 2016 5:07 pm
Forum: Beginners
Topic: VNC login failure. Access is denied
Replies: 1
Views: 10724

Re: VNC login failure. Access is denied

U need to add the user id jschaller to the vncserver on raspberry pi: 1. First time log in as user pi 2. Go to the screen display connected to the Pi and click on the VNC server icon that appears on top 3. Click on more --> options 4. click on users and permission and the click on the Add button 5. ...
by sudhir_brahma
Sun Dec 18, 2016 1:49 pm
Forum: Graphics, sound and multimedia
Topic: ffmpeg too slow
Replies: 4
Views: 2446

ffmpeg too slow

I have a Pi2-B. I need to down-convert multiple files of 1080p H264 video for 20 secs to VGA and high422 profile. The conversion time using ffmpeg is over 45 secs ie twice the capture time!!! Details: I have chunks of H.264 video files, 15 to 20 secs duration each, made from Raspivid, using a standa...
by sudhir_brahma
Sun Nov 27, 2016 1:11 pm
Forum: Raspbian
Topic: Jessie_lite: Autologin issues
Replies: 2
Views: 793

Re: Jessie_lite: Autologin issues

If the programs don't need the GUI then build systemd service files for them. It's easiest. https://www.raspberrypi.org/forums/viewtopic.php?p=921354#p921354 Thank you Sir! It worked! I made some changes to the service: It was running it thrice earlier. Now with this change it is just fine! [Unit] ...
by sudhir_brahma
Sun Nov 27, 2016 4:21 am
Forum: Raspbian
Topic: Jessie_lite: Autologin issues
Replies: 2
Views: 793

Jessie_lite: Autologin issues

. Objective: I need to run some bash scripts at startup Tried the following with Jessie Lite http://stackoverflow.com/questions/33753985/raspberry-pi-auto-login-without-etc-inittab (even did the changes the changes mentioned by Steve- see below the most voted answer by Tom Mekken) Also tried this: h...
by sudhir_brahma
Sat Nov 26, 2016 1:56 pm
Forum: Raspbian
Topic: Unable to download Jessie or Jessie lite
Replies: 4
Views: 980

Re: Unable to download Jessie or Jessie lite

Thank you all for yr suggestions. I traced it to an issue , most likely with my broadband connection. This is something I will need to take it up with my ISP. Thank you once again
by sudhir_brahma
Sat Nov 26, 2016 8:54 am
Forum: Raspbian
Topic: Unable to download Jessie or Jessie lite
Replies: 4
Views: 980

Re: Unable to download Jessie or Jessie lite

Thanks Buja. The official link u mention, eventually take u there - I tried them all.
See http://downloads.raspberrypi.org/raspbian_lite/images/

or for the full one
http://downloads.raspberrypi.org/raspbian/images/
by sudhir_brahma
Sat Nov 26, 2016 12:34 am
Forum: Raspbian
Topic: Unable to download Jessie or Jessie lite
Replies: 4
Views: 980

Unable to download Jessie or Jessie lite

Both these links: For Lite http://ftp.jaist.ac.jp/pub/raspberrypi/raspbian_lite/images/raspbian_lite-2016-09-28/2016-09-23-raspbian-jessie-lite.zip For Jessie (full): http://ftp.jaist.ac.jp/pub/raspberrypi/raspbian/images/raspbian-2016-09-28/2016-09-23-raspbian-jessie.zip Just timeout. Most of the m...
by sudhir_brahma
Mon Oct 03, 2016 1:01 pm
Forum: Advanced users
Topic: STICKY: HOWTO: Move the filesystem to a USB stick/Drive
Replies: 339
Views: 518961

Re: HOWTO: Move the filesystem to a USB stick/Drive

Very useful! Pl keep this link active.
by sudhir_brahma
Thu Sep 29, 2016 1:14 pm
Forum: Camera board
Topic: New 8MP Camera - Q&A thread
Replies: 450
Views: 192175

Re: New 8MP Camera - Q&A thread

OK- looks like I was able to fix the issue: I used the spanner mentioned above and adjusted the lens - now things are sharp
Many thanks to racer993
by sudhir_brahma
Thu Sep 29, 2016 12:52 pm
Forum: Camera board
Topic: New 8MP Camera - Q&A thread
Replies: 450
Views: 192175

Re: New 8MP Camera - Q&A thread

I am facing a similar problem too with the 8 MPixel camera. Everything seems to be blurred- both near and far objects. I am running raspistill and saving the file. Using Pi3 Jessie Is this a manufacturing defect (like u say- lens positioning)? How does one go about fixing it? I bought this from RS c...
by sudhir_brahma
Sat Sep 24, 2016 1:01 pm
Forum: Troubleshooting
Topic: apt-get install bc not working on pi3 Jessy
Replies: 4
Views: 5306

Re: apt-get install bc not working on pi3 Jessy

ShiftPlusOne wrote:bc installs fine. If you're having issues, it's a symptom of a larger problem.
ShiftplusOne: are u saying that 'apt-get install bc' just works fine for you with a fresh Jessie installation on raspberry pi 3? regards Sudhir
by sudhir_brahma
Sat Sep 24, 2016 5:29 am
Forum: Troubleshooting
Topic: apt-get install bc not working on pi3 Jessy
Replies: 4
Views: 5306

Re: apt-get install bc not working on pi3 Jessy

Ok I tried the following and it works : 1. Download the bc package from https://packages.debian.org/jessie/armhf/bc/download . The deb file is http://ftp.us.debian.org/debian/pool/main/b/bc/bc_1.06.95-9_armhf.deb 2. I moved that .deb file to /var/cache/apt/archives/bc_1.06.95-9_armhf.deb 3. Then ran...
by sudhir_brahma
Sat Sep 24, 2016 4:30 am
Forum: Troubleshooting
Topic: apt-get install bc not working on pi3 Jessy
Replies: 4
Views: 5306

apt-get install bc not working on pi3 Jessy

I did the 'apt-get update' a several times successfully (no errors), did the package upgrade ( ' apt-get upgrade'). In both cases I was logged in as root. Then I did a 'apt-get install bc' to get floating point capability in (I use bash scripts) . This returned just nothing! Blank output on the next...
by sudhir_brahma
Wed Jun 24, 2015 5:16 am
Forum: Advanced users
Topic: STICKY: HOWTO: Move the filesystem to a USB stick/Drive
Replies: 339
Views: 518961

Re: HOWTO: Move the filesystem to a USB stick/Drive

Thanks DougieLawson and rpdom. Ran the reboot tests overnight, 674 times. No issues seen. Mounted the /boot partition and it goes belly up. The green light turns on (no ssh so can not see what is going on). Most likely a long fsck. Turned it off (pulled the plug and put it back) and the same unit wi...
by sudhir_brahma
Tue Jun 23, 2015 5:47 pm
Forum: Advanced users
Topic: STICKY: HOWTO: Move the filesystem to a USB stick/Drive
Replies: 339
Views: 518961

Re: HOWTO: Move the filesystem to a USB stick/Drive

I just discovered that windows natively does not allow more than 1 partition on a removable drives, like a USB/sd etc. Could that be for good reason ie that corruption is seen in such attempts. Is that the reason for our issue as well ie that /boot and /root partitions when created on the same sd ca...

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