I would like to remind an issue regarding mdtest-hard benchmark. It
creates files in a single directory for at least five minutes. When
the metadata performance is more improved, the greater number of files
will be created. This will hit the limit of the number of files in a
Actually, the limit of Lustre file system is about 8M files although
it depends the length of the pathname. When the metadata performance
is better than 27K IOPS, it is not possible to execute the mdtest-hard
create benchmark for five minutes since the number of files is larger
This is a reason we cannot submit the Lustre result. I expect this
will be quite common when the metadata performance is more improved.
Osamu Tatebe, Ph.D.
Center for Computational Sciences, University of Tsukuba
1-1-1 Tennodai, Tsukuba, Ibaraki 3058577 Japan