Difference between revisions of "Ploop/sparse"
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'''Sparse file''' is a file that contains blocks of zeroes that are not allocated on disk (see [[w:Sparse file]]). By design, ploop images can't contain such non-allocated blocks. | '''Sparse file''' is a file that contains blocks of zeroes that are not allocated on disk (see [[w:Sparse file]]). By design, ploop images can't contain such non-allocated blocks. | ||
| − | While ploop is never creating sparse image files, they can be accidentally made so when tools such as <code>rsync --sparse</code> or <code>cp --sparse=always</code are used to copy images. So, one should not use backup or copy tools that create sparse files out of non-sparse ones. | + | While ploop is never creating sparse image files, they can be accidentally made so when tools such as <code>rsync --sparse</code> or <code>cp --sparse=always</code> are used to copy images. So, one should not use backup or copy tools that create sparse files out of non-sparse ones. |
Since [[Download/ploop/1.10|ploop-1.10]], ploop images are checked for being sparse and are automatically fixed on mount, in case DiskDescriptor.xml is used. Otherwise, you can use <code>ploop check --repair-sparse</code> to check for and repair such images. | Since [[Download/ploop/1.10|ploop-1.10]], ploop images are checked for being sparse and are automatically fixed on mount, in case DiskDescriptor.xml is used. Otherwise, you can use <code>ploop check --repair-sparse</code> to check for and repair such images. | ||
Revision as of 12:42, 20 November 2013
Sparse file is a file that contains blocks of zeroes that are not allocated on disk (see w:Sparse file). By design, ploop images can't contain such non-allocated blocks.
While ploop is never creating sparse image files, they can be accidentally made so when tools such as rsync --sparse or cp --sparse=always are used to copy images. So, one should not use backup or copy tools that create sparse files out of non-sparse ones.
Since ploop-1.10, ploop images are checked for being sparse and are automatically fixed on mount, in case DiskDescriptor.xml is used. Otherwise, you can use ploop check --repair-sparse to check for and repair such images.
