It defaults to 4k:
mmlsfs testbs8M -i
flag                value                    description
------------------- ------------------------
 -i                 4096                     Inode size in bytes

I think you can make as small as 512b.   Gpfs will store very small files
in the inode.

Typically you want your average file size to be your blocksize and your
filesystem has one blocksize and one inodesize.

On Thu, Sep 22, 2016 at 2:36 PM, Stef Coene <> wrote:

> Hi,
> Is it needed to specify a different blocksize for the system pool that
> holds the metadata?
> IBM recommends a 1 MB blocksize for the file system.
> But I wonder a smaller blocksize (256 KB or so) for metadata is a good
> idea or not...
> Stef
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