To answer both Mark and Tom
1) Both the 1k and 4k block experiment topped out at
54% of the file system full, so, yes, you do run out
of inodes sooner, but you have more "capacity" for
inodes with 4k blocks.
Additionally, chasing the inode chain from disk (not
cache) would be quicker with 4k blocks because there
would be 1/4 the number of i/o's.
2) No, you do not get more blocks with 1k blocksize
because of the heavy eckd overhead.
1k 4k
blocks 1,626,740 2,366,164
And fewer blocks are used to contain directory
information in the 4k case.
If you increase the number of inodes, you will still
get more small files on a 4k eckd image.
Tom is right in that, if some of your files are more
than 4k, then 4k rapidly becomes the choice, even if
you are not inihibited by eckd formatting. Even if
/etc, which are "small files", most of the files are
greater than 1k and and a goodly number are over 4k.
I don't see how 1k blocks are reasonable on 3390 ecked
devices under any circumstances.
=====
Jim Sibley
RHCT, Implementor of Linux on zSeries
"Computer are useless.They can only give answers." Pablo Picasso
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