ITEM: D5266L

Large file full of nulls is decreased with backup by name and restore.

Question:

Problem with the backup routine/command:

If he has a file that has been created with a series of nulls, when he
restores it, it will eliminate the nulls.

The 'ls' of the file look ok but the du will not show the allocated.

The backup by name will back up only the data from a file.  If the
file is full of nulls then that is lost.  What will happen in the
inode structure is that the inodes will continue to be allocated, but
they will not have pointers to data blocks.  Thus the 'ls' will show a
file of large size, but the 'du' will show a file of small size.
Options are to use backup by inode, tar or cpio.




Support Line: Large file full of nulls is decreased with backup by name and restore. ITEM: D5266L

Dated: September 1993 Category: N/A

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