'in the day' we ran programs using chron regularly to check things
like file system full, etc, and sometimes take action if things were
overly full.

/tmp and /var are pretty normal to fill up, but if / fills, you get
into deeper pookie.  That is why there is a reserve limit that allows
root to have some space even if everything is full to over full.

I have had problems with /home filling too.

But we don't seem to run chron tasks like we used to.  I guess the
world is 'safer and kinder' ... but then we find it is not on
occasion.

...

>From my memory of UNIX history, using lots of separate file systems
was to help things back when 100M disk drives were 'big', and a 2G
drive (if you could afford one) was HUGE.  Also backups were done
often on a 'device' or at least partition level, and normally to tape
or CD, not to more drives (it was done, but the cost of drive space
was high and not sufficiently reliable).  Remember the 'dump levels'
in the fstab?  They were used to control backups 'in the day'.  Most
backup systems ignore those flags anymore, but they are still used for
fsck counts, etc.

I just purchased a couple of 2T drives, and a 4T drive, making some of
the old logic fall apart.  The new level of systems that are built
with this type of storage in mind seem to be used assuming that
'filling up' is not an issue anymore.  For many people, that is
correct. But they still need to be backed up (either to more 'big
data' drives or online, or my old-school favorite ... to tape.  But
LTO drives are pretty expensive, and most others are to small to be
serious devices in todays 'big data' systems. $1500+/drive but you can
put 1.5T on a $35 tape (or 3T compressed by hardware, but not all data
can compress well).  Even fairly large backup systems use 3 to 6
drives and small libraries that hold 50 or so tapes and a door to
allow ejecting or loading 10 at a time.)


Enough pontificating for now.

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