[Lustre-discuss] Tar backup of MDT runs extremely slow, tar pauses on pointers to very large files

[Alex Kulyavtsev]

Is this the same issue as at "backup MDT question" (and follow up)
	http://lists.lustre.org/pipermail/lustre-discuss/2009-April/010151.html
due to sparse files on MDT?  Does tar take a lot of CPU?
Alex.

On May 30, 2012, at 5:02 PM, Andreas Dilger wrote:

>>> 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.

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