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Top Forums UNIX for Advanced & Expert Users Why is editing a file by renaming the new one safer? Post 303042579 by MadeInGermany on Monday 30th of December 2019 11:04:48 AM
Old 12-30-2019
They mean: copying a file, especially a big file, is done in steps. If there is a power loss in between, the status of the file is unknown: can be empty or partially copied.
In contrast, renaming/moving a file is "atomic": after a power loss it's either 100% the new file or 100% the old file.

But with a copy speed of >100 Mbyte per second and "journaling" it is a bit paranoid to assume a power loss within these microseconds, IMHO.
So that's why I prefer to keep the inode intact (including attributes and link count), and simply assume that power will last for the next microseconds.
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SYSTEMD-SLEEP.CONF(5)						systemd-sleep.conf					     SYSTEMD-SLEEP.CONF(5)

NAME
systemd-sleep.conf - Suspend and hibernation configuration file SYNOPSIS
/etc/systemd/sleep.conf DESCRIPTION
systemd supports three general power-saving modes: suspend a low-power state where execution of the OS is paused, and complete power loss might result in lost data, and which is fast to enter and exit. This corresponds to suspend, standby, or freeze states as understood by the kernel. hibernate a low-power state where execution of the OS is paused, and complete power loss does not result in lost data, and which might be slow to enter and exit. This corresponds to the hibernation as understood by the kernel. hybrid-sleep a low-power state where execution of the OS is paused, which might be slow to enter, and on complete power loss does not result in lost data but might be slower to exit in that case. This mode is called suspend-to-both by the kernel. Settings in this file determine what strings will be written to /sys/power/disk and /sys/power/state by systemd-sleep(8) when systemd(1) attempts to suspend or hibernate the machine. OPTIONS
The following options can be configured in the "[Sleep]" section of /etc/systemd/sleep.conf: SuspendMode=, HibernateMode=, HybridSleepMode= The string to be written to /sys/power/disk by, respectively, systemd-suspend.service(8), systemd-hibernate.service(8), or systemd- hybrid-sleep.service(8). More than one value can be specified by seperating multiple values with commas. They will be tried in turn, until one is written without error. If neither suceeds, the operation will be aborted. SuspendState=, HibernateState=, HybridSleepState= The string to be written to /sys/power/state by, respectively, systemd-suspend.service(8), systemd-hibernate.service(8), or systemd- hybrid-sleep.service(8). More than one value can be specified by seperating multiple values with commas. They will be tried in turn, until one is written without error. If neither suceeds, the operation will be aborted. EXAMPLE
: FREEZE Example: to exploit the "freeze" mode added in Linux 3.9, one can use systemctl suspend with [Sleep] SuspendState=freeze SEE ALSO
systemd-sleep(8), systemd-suspend.service(8), systemd-hibernate.service(8), systemd-hybrid-sleep.service(8), systemd(1), systemd.directives(7) systemd 208 SYSTEMD-SLEEP.CONF(5)
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