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Re: [K12OSN] Large File Size Questions


When i've had to deal with really large files
in the past, I pipe the output through the 'split' command
and it produces a bunch of smaller files that are more

  <some_command>  | split --bytes=2000m

that will produce a bunch of 2gb sized files called xaa, xab,
xac, ...

Then, when you want to send the file back out to be
restored, you can 'cat' the smaller files back out through
a pipe.

   cat xa* | <some_other_command>

Hope that helps,

Jim McQuillan
jam Ltsp org

On Tue, 26 Nov 2002, Scott Sherrill wrote:

> Hey -
> Problem -
> Creating a file > 2GB in Linux.
> I am trying to create a disk image of a mac hard drive that is larger 
> than 2GB.    I don't know if the problem stems from the file system, 
> or netatalk.  (I have a beta copy of disk copy that does allow 
> images > 2GB and I can use it to duplicate images to a local attached 
> drives).
> I am attempting to create the large file on YellowDog 2.3 with a 
> 2.4.19 kernel running netatalk  There is plenty of space on 
> the drive, and it's currently formatted ext2 with 4096 block size. 
> I've tried 1K blocks and 2K blocks, and ext3 as well.
> Here's the silly question -
> What would the syntax be to create a 2+ GB file using DD?  I want to 
> rule out the filesystem as the problem by creating a large file from 
> the command line, and I just can't get the syntax for DD right....
> Side question -
> Shouldn't I need to have at least 2K blocks in order to have files 
> larger than 2GB on ext2/3?
> Tougher question -
> I've scoured the docs in netatalk - does it have a file size limit 
> that's interfering with me?
> Why am I doing this? -
> I am hoping to duplicate the netboot system on Linux detailed at 
> http://mike.passwall.com/macnc/  but instead of running the OS off of 
> the netboot image, have the netboot image perform an automatic system 
> restore.  If a teacher is having trouble with their iMac (or iBook 
> etc), reboot, hold the N key down (to netboot) and the machine is 
> autorestored back to it's pristine state.
> Anyway, any suggestions or assistance would be greatly appreciated.
> Thanks -
> Scott


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