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Top Forums UNIX for Beginners Questions & Answers How to manage disk usage in Ubuntu? Post 303023774 by Azrael on Saturday 22nd of September 2018 02:07:40 AM
Old 09-22-2018
Let me attempt to answer these one at a time:

1. how to stop all process in case hdd capacity is almost full and create space for system files? Not sure if you truly mean "all processes" as that would shut down the whole system. Or how you would intend to create space. If you are wanting to allocate more space from somewhere or if you want to remove unneeded files.

2. if possible, to prevent filesystem to write anything into hdd when there is such a risk? There is already such a threshold called "reserved space". You can actually fill a disk to 100% and see 0MB available and yet there is there is some reserved space to keep the system online. This can be adjusted, but its pretty standard to have in every Linux distro.

3. if there is any script that can manage/control the disk usage and protect the system? It's possible, but again, not sure if you are wanting to allocate more space from another resource or get rid of unneeded content. The reserved space I just mentioned may suffice for this problem as well.

4. if possible to fix via recovery mode when disk usage is at 100%? Yes, but as I also mentioned, SSH should still work at 100% because of the reserved space.

Last edited by Neo; 09-22-2018 at 03:14 AM..
 

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acctsuspend(5)							File Formats Manual						    acctsuspend(5)

NAME
acctsuspend, acctresume - suspend and resume accounting when available disk space reaches threshold VALUES
Failsafe Default. Default acctsuspend: acctresume: Allowed values acctresume: acctsuspend: Recommended values acctsuspend: acctresume: (But more than acctsuspend) DESCRIPTION
The and tunables control when accounting stops and resumes due to disk space constraints. When free disk space on the file system being used by accounting reaches the suspension threshold, which is the percentage relative to the percentage of disk space available only to the superuser, accounting is suspended until such time as the free disk space reaches the resumption threshold, which is the percentage rela- tive to the percentage of disk space available only to the superuser. Note: Since the and values are specified relative to the percentage of disk space available only to the superuser, negative values of these parameters can make sense. For example, if the superuser has reserved 10 percent of the disk space on the file system at file system creation time, and acctsuspend is -5 and acctresume is 0, the suspension threshold will be 5 percent of the total disk space and the resumption threshold will be 10 percent of the total disk space. Who Is Expected to Change This Tunable? Anyone using accounting. Restrictions on Changing Changes to this tunable take effect at the next reboot. When Should the Value of This Tunable Be Raised? Increasing either variable should be considered when it is necessary to maintain a higher percentage of free space on the accounting filesystem. What Are the Side Effects of Raising the Value of This Tunable? The higher either value is, the less accounting data may be captured. The further the values are separated, the greater the amount of potentially lost accounting data. When Should the Value of This Tunable Be Lowered? If additional disk space is needed for accounting data, and it cannot be obtained by moving files off of the filesystem, then the value of should be lowered. What Are the Side Effects of Lowering the Value of This Tunable? Filesystem performance (writing accounting records) decreases as the filesystem fills up. In turn, this will decrease the overall perfor- mance of accounting processes. What Other Tunables Should Be Changed at the Same Time? When changing either of these tunables, both should be considered. WARNINGS
All HP-UX kernel tunable parameters are release specific. This parameter may be removed or have its meaning changed in future releases of HP-UX. Installation of optional kernel software, from HP or other vendors, may cause changes to tunable parameter values. After installation, some tunable parameters may no longer be at the default or recommended values. For information about the effects of installation on tun- able values, consult the documentation for the kernel software being installed. For information about optional kernel software that was factory installed on your system, see at AUTHOR
and were developed by HP. SEE ALSO
accton(1M). Tunable Kernel Parameters acctsuspend(5)
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