[ ... ] > The tar backup of the MDT is taking a very long time. So far it has > backed up 1.6GB of the 5.0GB used in nine hours. In watching the tar > process pointers to small or average size files are backed up quickly > and at a consistent pace. When tar encounters a pointer/inode > belonging to a very large file (100GB+) the tar process stalls on that > file for a very long time, as if it were trying to archive the real > filesize amount of data rather than the pointer/inode.
If you have stripes on, a 100GiB file will have 100,000 1MiB stripes, and each requires a chunk of metadata. The descriptor for that file will have this potentially a very large number of extents, scattered around the MDT block device, depending on how slowly the file grew etc. _______________________________________________ Lustre-discuss mailing list Lustre-discuss@lists.lustre.org http://lists.lustre.org/mailman/listinfo/lustre-discuss
