As an aside, it's generally a good idea to use larger chunk sizes to make random data generation run faster. The Python example below can generate 4GB of random data in about 10s on my laptop: #!/usr/bin/env python3 import os CHUNK_SIZE = 2 ** 16 NUMBER = 0x100000000 # 2^32 copies without md5 detected error, file legnth 4294967296 #NUMBER = 0x400000000 # 4*2^32 copies are erroneous from md5sum, file legnth 17179869184 #NUMBER = 0x200000000 # 2*2^32 copies are erroneous from md5sum, file legnth 8589934592 #NUMBER = 0x100000001 # 2^32+1 copies without md5 detected error, file legnth 4294967297 #NUMBER = 0x180000000 # copies without md5 detected error, file legnth 6442450944 #NUMBER = 0x1FFFFFFFF def write_file(length, chunk_size): with open('bigfile', 'wb') as outfile: for _ in range(length // chunk_size): outfile.write(os.urandom(chunk_size)) def main(): write_file(NUMBER, CHUNK_SIZE) if __name__ == '__main__': main() On Thu, Apr 28, 2022 at 8:46 PM Kevin Stratton via WLUG <wlug@lists.wlug.org> wrote:
Thank you for reminding me about memtest86, I had a bad memory module. I am trying to RMA it now. It seems unlikely that the memory would go bad after about a year. Live and learn....
Ubuntu just updated to 22.04 with the kernel 5.15.0-27-genericOn 4/28/2022 1:56 PM, Chuck Anderson wrote:
What are the kernel version(s)? What filesystem?
I suggest:
- Try memtest86+
- Try a live Fedora 35 on a USB stick since all your other tests were relying on Ubuntu, even the Windows 10 which was a VM on Ubuntu. Fedora usually has much newer kernels, so if there is a Linux bug, it might be fixed already.
I have been chasing my tail trying to download a very large to my desktop. The bug is strange enough that it might be specific to hardware.
The issue is that I can not copy very large files accurately. The
On Thu, Apr 28, 2022 at 11:55:04AM -0400, Kevin Stratton via WLUG wrote: threshold value size of the file seems to be about 8589934592. Any file this size or larger seems to be uncopyable on my desktop.
I had downloaded a corrupted file of 71.9GB with Ubuntu 20.04, Ubuntu
22.04, Windows 10 virtua machine running under Ubuntu 20.04, Manjaro. All of theses OS;s were running on the same hardware.
I had no issues downloading the file from a raspberry pi with and
external hard drive.
I have included the C file I used to create the files which also has
some notes opn the results of the tests.
Any advice or help would be appreciated.
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