09-19-2018
How to manage disk usage in Ubuntu?
Hello,
I have been running under ubuntu 14.04 trusty and 18.04 bionic.
What I wonder is about:
* how to stop all process in case hdd capacity is almost full and create space for system files
* if possible, to prevent filesystem to write anything into hdd when there is such a risk
* if there is any script that can manage/control the disk usage and protect the system.
* if possible to fix via recovery mode when disk usage is at 100%
Many thanks
Boris
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LEARN ABOUT HPUX
prealloc
prealloc(1) General Commands Manual prealloc(1)
NAME
prealloc - preallocate disk storage
SYNOPSIS
name size
DESCRIPTION
preallocates at least size bytes of disk space for an ordinary file name, creating the file if name does not already exist. The space is
allocated in an implementation-dependent fashion for fast sequential reads and writes of the file.
fails and no disk space is allocated if name already exists and is not an ordinary file of zero length, if insufficient space is left on
disk, or if size exceeds the maximum file size or the file size limit of the process (see ulimit(2)). The file is zero-filled.
DIAGNOSTICS
returns one of the following values upon completion:
0 Successful completion.
1 name already exists and is not an ordinary file of zero length.
2 There is insufficient room on the disk.
3 size exceeds file size limits.
EXAMPLES
The following example preallocates 50000 bytes for the file
WARNINGS
Allocation of file space is highly dependent on current disk usage. A successful return does not indicate how fragmented the file actually
might be if the disk is approaching its capacity.
AUTHOR
was developed by HP.
SEE ALSO
prealloc(2), ulimit(2).
prealloc(1)