????: [Pvfs2-users] The unexpected results of running MPI-IO on PVFS2

[Robert Latham]

On Tue, Nov 20, 2007 at 05:41:16PM -0800, xuechen zhang wrote:
> Then I tied to tune directories according to what are listed on the website,
> like this "setfattr -n 'usr.pvfs2.num_dfiles' -v '1' /mnt/pvfs2/dir_ss1",
> then I got error "No such file or directory". However, 'dir_ss1' does exist
> because it is created by 'pvfs2-mkdir'. This time, when I add the prefix
> 'pvfs2:' to the path, it still does not work. Please help me again.

Ah, OK.. if you are bypassing the kernel, try the 'pvfs2-xattr'
utility.   If the 'setfattr' way looks like this:

setfattr -n 'usr.pvfs2.num_dfiles' -v '1' /mnt/pvfs2/dir_ss1

the 'pvfs2-xattr' way looks like this:

pvfs2-xattr -s -k 'usr.pvfs2.num_dfiles' -v '1' /mnt/pvfs2/dir_ss1

By the way, the 'pvfs2:' prefix only works for ROMIO (MPI-IO)
applications.

==rob

-- 
Rob Latham
Mathematics and Computer Science Division    A215 0178 EA2D B059 8CDF
Argonne National Lab, IL USA                 B29D F333 664A 4280 315B