On Mon, Jan 30, 2012 at 06:34:52PM -0200, Kelbel Junior wrote: > How you prefer to pre allocate space? > xfs I/O or by 'dd' to do it? > > What other information you would like to better understand and manage > to solve this problem? Do you expect to fill most of the file with data? In that case preallocating the file before starting I/O is the best way to do it. >From the shell you can do it using the xfs_io 'resvsp' command, and from C code using the fallocate system call, or if it's not present the xfs RESVSP ioctl, as documented by the xfsctl manpage when you have the xfsprogs development libraries installed. If you actually want to keep the file sparse it's much harder. You could try larger I/O sized, or trying using the xfs extent size hint which is set using the XFS_IOC_FSSETXATTR ioctl, again documented in the xfsctl man page. _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
