qcow2 sparse file

압축 다시 해봐야겠다...

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오오... 망할 -_- 진작에 찾아볼걸

$ tar -cvfS test_spar.tar 123123.qcow2 $ tar -S -cvf test_spar.tar 123123.qcow2  $ ll -rw-------. 1 root root   9665380352 Aug  8  2018 123123.qcow2 -rw-r--r--. 1 root root      1484800 Feb 14 18:10 test_spar.tar -rw-r--r--. 1 root root   9665382400 Feb 14 18:09 test.tar

To have tar attempt to recognize the holes in a file, use `--sparse' (`-S').

[링크 : https://www.gnu.org/software/tar/manual/html_node/sparse.html]

Advantages The advantage of sparse files is that storage is only allocated when actually needed: disk space is saved, and large files can be created even if there is insufficient free space on the file system. Disadvantages Disadvantages are that sparse files may become fragmented; file system free space reports may be misleading; filling up file systems containing sparse files can have unexpected effects; and copying a sparse file with a program that does not explicitly support them may copy the entire, uncompressed size of the file, including the sparse, mostly zero sections which are not on disk -- losing the benefits of the sparse property in the file.

[링크 : https://wiki.archlinux.org/index.php/sparse_file]

ls -s tells you the allocated size of the file, always a multiple of the allocation unit. ls -l tells the actual size. An easy way to test:

[링크 : https://askubuntu.com/questions/269480/why-does-ls-l-output-a-different-size-from-ls-s]

[링크 : https://www.lisenet.com/2014/so-what-is-the-size-of-that-file/]

$ man ls        --block-size=SIZE               scale sizes by SIZE before printing them; e.g., '--block-size=M'               prints sizes in units of 1,048,576 bytes; see SIZE format below

2019/02/12 - [프로그램 사용/kvm(virt-manager)] - qcow2 파일크기의 오류?