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Individual file size limit on HP-UX


 
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Operating Systems HP-UX Individual file size limit on HP-UX
# 1  
Old 07-31-2011
Individual file size limit on HP-UX

I got a question on ulimit on HP-UX. I have a log file that gets more than 2 GB and the application crashes because it can not write to log. I browsed through the forum and found one very similar post on ulimit but that was not concluded. Did some analysis and below is some output.
Code:
[/home/user1]>getconf KERNEL_BITS
64
[/home/user1]>ulimit -a
time(seconds)        unlimited
file(blocks)         unlimited
data(kbytes)         2097152
stack(kbytes)        161792
memory(kbytes)       unlimited
coredump(blocks)     4194303
[/home/user1]>uname -s
HP-UX
[/home/user1]>uname -r
B.11.11
[/home/user1]>ulimit -f
unlimited

What is controlling the file size here ? I thought file size is unlimited here. Is there any way to increase the individual max file size limit to some higher value say 8 GB?

Thanks.
# 2  
Old 07-31-2011
What version of HP-UX are you using?
# 3  
Old 07-31-2011
HP-UX 11i v1
Thanks.
# 4  
Old 08-01-2011
I belive you can compile your C program with this option to open files greater then 2GB
Code:
-D_FILE_OFFSET_BITS=64

You will require ANSI C compiler.
Unfortunatly i cannot test this since i don't have v1 avalible, but same works on v2
Code:
[tst]>cat test.c ## Some code i found online...
#include <stdio.h>
#include <fcntl.h>
int main(int argc, char **argv){
      char *fname;
      int fd, hasread;
      if(argc > 1){
        fname = argv[1];
        fprintf(stdout, "Filename is %s\n", fname);
      }
      fd = open(fname, O_RDONLY);
      if(fd == -1 ){
        perror("Could not open file");
        return 1;
      }
      fprintf(stdout, "File %s was open successfully\n", fname);
      close(fd);
      return 0;
    }
[tst]>du -sk largefile
2099624 largefile
[tst]>cc test.c
[tst]>./a.out largefile
Filename is largefile
Could not open file: Value too large to be stored in data type
[tst]>rm a.out
[tst]>cc -D_FILE_OFFSET_BITS=64 test.c
[tst]>./a.out largefile
Filename is largefile
File largefile was open successfully

Hope that helps.
Regards.

Last edited by Peasant; 08-01-2011 at 12:02 PM.. Reason: Left machine hostname :)
# 5  
Old 08-01-2011
Thanks for your quick response. I wanted to have a limit configured at OS level. It is not any specific C code in the application that writes to log but there are many Java, C++, reports that run to generate the log file. One question -
is the ulimit setting as shown in my first message correct to allow more than 2 GB file size ? I see file(blocks)=unlimited but data (kbytes) is about 2 GB.
# 6  
Old 08-01-2011
I believe that would be data(kbytes) 2097152
Kernel parameter would be maxdsiz/maxdsiz64

The ulimit value is represented in KB, while maxdsiz is in B.

Regards
Peasant.
# 7  
Old 08-02-2011
What filesystem are you using and what commands were used to create the filesystem? Is "largefiles" (i.e. >2Gb) enabled on the filesystem and mentioned in /etc/fstab? See for example "man fsadm_vxfs" (depends on what filesystem you have). Even if the filesystem allows files >2Gb it does not mean that the application has code which can create files larger than 2Gb.
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