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README: slightly update the section about split /usr 

It's fine if /usr is actually on a separate fs. What matters is that it
is mounted early enough. Say so.
This commit is contained in:
Lennart Poettering 2017-11-17 11:39:48 +01:00
parent 01c8938e54
commit 9e93f6f092
1 changed files with 10 additions and 10 deletions
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@ -283,16 +283,16 @@ SYSV INIT.D SCRIPTS:
needs to look like, and provide an implementation at the marked places.
WARNINGS:
systemd will warn you during boot if /usr is on a different
file system than /. While in systemd itself very little will
break if /usr is on a separate partition, many of its
dependencies very likely will break sooner or later in one
form or another. For example, udev rules tend to refer to
binaries in /usr, binaries that link to libraries in /usr or
binaries that refer to data files in /usr. Since these
breakages are not always directly visible, systemd will warn
about this, since this kind of file system setup is not really
supported anymore by the basic set of Linux OS components.
systemd will warn during early boot if /usr is not already mounted at
this point (that means: either located on the same file system as / or
already mounted in the initrd). While in systemd itself very little
will break if /usr is on a separate, late-mounted partition, many of
its dependencies very likely will break sooner or later in one form or
another. For example, udev rules tend to refer to binaries in /usr,
binaries that link to libraries in /usr or binaries that refer to data
files in /usr. Since these breakages are not always directly visible,
systemd will warn about this, since this kind of file system setup is
not really supported anymore by the basic set of Linux OS components.
systemd requires that the /run mount point exists. systemd also
requires that /var/run is a symlink to /run.