Difference between revisions of "Fallocate"

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{{lowercase}}
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<code>fallocate</code> preallocate or deallocate space to a [[file]], it is not supported in [[ZFS]]<ref>https://github.com/openzfs/zfs/issues/326</ref>, use <code>[[dd]]</code> instead of.
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* Man page: https://man7.org/linux/man-pages/man1/fallocate.1.html
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== Examples ==
 
  fallocate -l 1G NEW_filename
 
  fallocate -l 1G NEW_filename
 
  fallocate -l 24M NEW_filename
 
  fallocate -l 24M NEW_filename
 
  -l --length
 
  -l --length
  
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fallocate -l 1G NEW_filename
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fallocate: fallocate failed: [[No space left on device]]
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fallocate
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fallocate: no filename specified
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== Options ==
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<pre>
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fallocate -h
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Usage:
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fallocate [options] <filename>
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Preallocate space to, or deallocate space from a file.
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Options:
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-c, --collapse-range remove a range from the file
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-d, --dig-holes      detect zeroes and replace with holes
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-i, --insert-range  insert a hole at range, shifting existing data
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-l, --length <num>  length for range operations, in bytes
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-n, --keep-size      maintain the apparent size of the file
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-o, --offset <num>  offset for range operations, in bytes
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-p, --punch-hole    replace a range with a hole (implies -n)
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-z, --zero-range    zero and ensure allocation of a range
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-x, --posix          use posix_fallocate(3) instead of fallocate(2)
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-v, --verbose        verbose mode
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-h, --help          display this help
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-V, --version        display version
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For more details see fallocate(1).
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</pre>
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== Execution examples ==
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fallocate
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fallocate: no filename specified
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fallocate -v -l 10G NEW_10G_FILE
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(not output on success)
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== Related commands ==
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* <code>[[df]]</code>
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* <code>[[truncate]]</code>
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* <code>[[head]]</code>
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* <code>[[dd]] if=[[/dev/zero]] of=YOUR_BIG_FILE bs=1 count=0 seek=100G</code>
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* <code>[[head -c]] 1G </dev/urandom >myfile</code>
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* <code>[[mkswap]]</code>
  
 
== See also ==
 
== See also ==
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* {{fallocate}}
 
* {{files}}
 
* {{files}}
 
* {{swap}}
 
* {{swap}}
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* {{du}}
  
 
[[Category:Linux commands]]
 
[[Category:Linux commands]]

Latest revision as of 08:22, 18 February 2024

fallocate preallocate or deallocate space to a file, it is not supported in ZFS[1], use dd instead of.


Examples[edit]

fallocate -l 1G NEW_filename
fallocate -l 24M NEW_filename
-l --length



fallocate -l 1G NEW_filename
fallocate: fallocate failed: No space left on device

fallocate
fallocate: no filename specified

Options[edit]

fallocate -h

Usage:
 fallocate [options] <filename>

Preallocate space to, or deallocate space from a file.

Options:
 -c, --collapse-range remove a range from the file
 -d, --dig-holes      detect zeroes and replace with holes
 -i, --insert-range   insert a hole at range, shifting existing data
 -l, --length <num>   length for range operations, in bytes
 -n, --keep-size      maintain the apparent size of the file
 -o, --offset <num>   offset for range operations, in bytes
 -p, --punch-hole     replace a range with a hole (implies -n)
 -z, --zero-range     zero and ensure allocation of a range
 -x, --posix          use posix_fallocate(3) instead of fallocate(2)
 -v, --verbose        verbose mode

 -h, --help           display this help
 -V, --version        display version

For more details see fallocate(1).


Execution examples[edit]

fallocate
fallocate: no filename specified

fallocate -v -l 10G NEW_10G_FILE
(not output on success)

Related commands[edit]

See also[edit]

  • ↑ https://github.com/openzfs/zfs/issues/326
    • Retrieved from "https://www.wikieduonline.com/index.php?title=Fallocate&oldid=301247"

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