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Diffstat (limited to 'qemu-img.texi')
| -rw-r--r-- | qemu-img.texi | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/qemu-img.texi b/qemu-img.texi index cc4668e64f..d64d05edda 100644 --- a/qemu-img.texi +++ b/qemu-img.texi @@ -419,6 +419,15 @@ Linux or NTFS on Windows), then only the written sectors will reserve space. Use @code{qemu-img info} to know the real size used by the image or @code{ls -ls} on Unix/Linux. +Supported options: +@table @code +@item preallocation +Preallocation mode (allowed values: @code{off}, @code{falloc}, @code{full}). +@code{falloc} mode preallocates space for image by calling posix_fallocate(). +@code{full} mode preallocates space for image by writing zeros to underlying +storage. +@end table + @item qcow2 QEMU image format, the most versatile format. Use it to have smaller images (useful if your filesystem does not supports holes, for example |