[Lustre-discuss] Tar backup of MDT runs extremely slow, tar pauses on pointers to very large files
aik at fnal.gov
Wed May 30 15:50:28 PDT 2012
Is this the same issue as at "backup MDT question" (and follow up)
due to sparse files on MDT? Does tar take a lot of CPU?
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
>>> and at a consistent pace. When tar encounters a pointer/inode
>>> belonging to a very large file (100GB+) the tar process stalls on
>>> 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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