fallocate
fallocate preallocate or deallocate space to a file, it is not supported in ZFS[1], use dd instead of.
Examples
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
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
fallocate fallocate: no filename specified
fallocate -v -l 10G NEW_10G_FILE (not output on success)
Related commands
head -c 1G </dev/urandom >myfile
See also
- 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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