Difference between revisions of "Fallocate"
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↑ https://github.com/openzfs/zfs/issues/326
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| + | {{lowercase}} | ||
| + | <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. | ||
| + | * Man page: https://man7.org/linux/man-pages/man1/fallocate.1.html | ||
| − | |||
| − | + | == Examples == | |
| + | fallocate -l 1G NEW_filename | ||
| + | fallocate -l 24M NEW_filename | ||
| + | -l --length | ||
fallocate -l 1G NEW_filename | fallocate -l 1G NEW_filename | ||
| − | fallocate | + | fallocate: fallocate failed: [[No space left on device]] |
| − | + | ||
| + | fallocate | ||
| + | fallocate: no filename specified | ||
== Options == | == Options == | ||
| Line 37: | Line 44: | ||
| − | == | + | == Execution examples == |
fallocate | fallocate | ||
| Line 44: | Line 51: | ||
fallocate -v -l 10G NEW_10G_FILE | fallocate -v -l 10G NEW_10G_FILE | ||
(not output on success) | (not output on success) | ||
| − | |||
== Related commands == | == Related commands == | ||
* <code>[[df]]</code> | * <code>[[df]]</code> | ||
* <code>[[truncate]]</code> | * <code>[[truncate]]</code> | ||
| + | * <code>[[head]]</code> | ||
| + | * <code>[[dd]] if=[[/dev/zero]] of=YOUR_BIG_FILE bs=1 count=0 seek=100G</code> | ||
| + | * <code>[[head -c]] 1G </dev/urandom >myfile</code> | ||
| + | * <code>[[mkswap]]</code> | ||
== See also == | == See also == | ||
| + | * {{fallocate}} | ||
* {{files}} | * {{files}} | ||
* {{swap}} | * {{swap}} | ||
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]
dftruncateheaddd if=/dev/zero of=YOUR_BIG_FILE bs=1 count=0 seek=100Ghead -c 1G </dev/urandom >myfilemkswap
See also[edit]
- fallocate, mkfile
- file, File system, directory,
touch,mkdir,ls,lntruncate,fallocate,split,stat, inode, File descriptor, superblock, block size (blockdev),fuser,lsof,scrub,chattr, ulimit (nofiles),cp,mv,file (command),mkfifo,chmod - Swap,
swapon,swapoff,mkswap,swaplabel,free,sar -r,sar -S,sar -W,vmstat,vm.swappiness,/proc/swaps,/etc/fstab, Add a swap disk,systemd.swap du, du -hs, Disk space usage,df,ls,tree,find,docker system df,journalctl --disk-usage, No space left on device, ENOSPC,sar -F,growpart,resize2fs, ncdu, duf, dua-cli
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