Re: stat(), st_size and st_allocsize

[jpcarr@xxxxxxxxxxxx]

Scott said;
>The one that baffles me is st_blksize.  OS/400 documentation says "the
>size of a block of the file" or "the block size of the file".   but, if
>that's the case, how can a file have 16k allocated and a block size of
>32k?!

>The documentation for FreeBSD claims that this field is "the optimal block
>size for I/O."   Which implies to me that it's actually the number of
>bytes read in each disk transfer from the filesystem to the operating
>system.   This makes more sense to me, but that doesn't seem to be saying
>what OS/400 is saying...  so I really don't know.>



I believe the 32k is the optimum/default blocked read size for all 400 Data
Base I/O.
The system will read 32k chunks of a DB2 file that it is doing a Full Data
Base Scan on.

HTH

John Carr