Maximum size of a file with JFS & AIX?

[stephnane]

Hi.

What's the maximum file size with AIX (and JFS)?
How can we change this value ?


tks.

Steph

 

[mrn]

Which version of AIX?

-
| Mike Nixon
| Unix Admin
-------------

 

[stephnane]

AIX 5.2

 

[mrn]

The maximum supported file size is 16 TB for 64-bit kernel and 1 TB for 32-bit kernel.


See

http://www-106.ibm.com/developerworks/eserver/articles/dutta_AIX5L.html

For full m.o.

-
| Mike Nixon
| Unix Admin
-------------

 

[mrn]

Sorry missed 2nd bit

see /etc/security/limits to set file/mem limits

see man limits



-
| Mike Nixon
| Unix Admin
-------------

 

[sbix]

It depends on which kind of JFS you are using.
With JFS2 you can theoretically allocate a file of 4 PetaByte

 

[mrn]

I'd like to see what was in a file 4Pb big, could you vi it I wonder?

-
| Mike Nixon
| Unix Admin
-------------

 

[sbix]

Well ... if you have more than 4 PB in /var ... and a lot of patience

 

[RodKnowlton]

mrn,

In AIX 4.3.3, vi is limited to 1,048,560 lines of {LINE_MAX} characters, or just shy of 2GB.

No, I haven't tried.

Rod Knowlton
IBM Certified Advanced Technical Expert pSeries and AIX 5L

 

[mrn]

I know, I was joking.......

Mike

"A foolproof method for sculpting an elephant: first, get a huge block of marble, then you chip away everything that doesn't look like an elephant."

 

[RodKnowlton]

I knew you were joking, Mike, but it still planted the seed.

Sometimes I've just gotta know.

Then I've gotta share.

Rod (I'm not compulsive at all) Knowlton

 

[mrn]

In that case whats the limit in 5.2?

Mike

"A foolproof method for sculpting an elephant: first, get a huge block of marble, then you chip away everything that doesn't look like an elephant."

 

[RodKnowlton]

Not having access to a 5L system right now, I don't need to know.

If you've got a 5.2 box and want to know, look in /usr/include/sys/limits.h to see what LINE_MAX is.

Since LINE_MAX is set to _POSIX2_LINE_MAX, which is 2048, in 4.3.3, I wouldn't be suprised if the limit remains the same in 5.2.


Rod Knowlton
IBM Certified Advanced Technical Expert pSeries and AIX 5L

 

[mrn]

#define _POSIX2_LINE_MAX 2048 /* max len of utility input line */
#define LINE_MAX _POSIX2_LINE_MAX

Mike

"A foolproof method for sculpting an elephant: first, get a huge block of marble, then you chip away everything that doesn't look like an elephant."