Large File Support for RedHat Linux 8.0 Kernal 2.4.18-14

Joe Griffin joe.griffin at mscsoftware.com
Fri Jun 13 17:25:43 EDT 2003


My RedHat 8.0 system writes files larger than 8 Gb.

everest <106> cat bigwrite.f
      program bigwrite
      integer buf(1024)
      do i=1,1024
       buf(i)=i
      enddo
      open( unit=21, access='direct', form='unformatted',
     1     status='unknown', recl=4096, err=700 )
      irec=1
c      do i=1,524288
c      do i=1,2*524288
      do i=1,4*524288
         irec=i
c      write(6,*) 'writing, irec =', irec
         write(21, rec=irec, err=800) buf
      enddo
      write(6,*) 'write done, irec =', irec
      close( unit=21 )
      stop
 700  continue
      write(6,*) 'open err'
      stop
 800  continue
      write(6,*) 'write err, irec=', irec
      close( unit=21 )
      end

everest <107> ifc bigwrite.f
   program BIGWRITE

26 Lines Compiled


everest <108> a.out
 write done, irec =     2097152


everest <109> ls -ltr fort.21
-rw-r--r--    1 jjg      develop  8589934592 Jun 13 14:27 fort.21

My file system is ext2.

Regards,
Joe Griffin


Steve Elliot wrote:

>Our RedHat 8.0 doesn't seem to support Large file
>system out of the box. We have a testing program
>running on an ext3 file system, with both
>_LARGEFILE_SOURCE and _FILE_OFFSET_BITS=64 defined,
>the lseek() function failed when the file pointer goes
>beyound 2G. What's the steps to turn the large file
>support on? and how do I know it is on?
>
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