shrinking kernel reserve space
lists at avi.co
Thu Mar 15 14:46:52 UTC 2012
CJ Tres wrote:
> I've got a 3 TB drive dedicated to backup a data partition and
> therefore I don't need the 5% reserved for the kernel.
> I found a command several days ago to shrink that space to a certain
> percentage but cannot remember what it was and evidently can't figure
> what the appropriate search term is to find it again.
It's not merely for privileged processes - it's also the free space used
to defragment the data on the filesystem, for example.
What you're after is tune2fs, specifically its -m switch:
Set the percentage of the filesystem which may only be
allocated by privileged processes. Reserving some
number of filesystem blocks for use by privileged pro-
cesses is done to avoid filesystem fragmentation, and
to allow system daemons, such as syslogd(8), to continue
to function correctly after non-privileged pro- cesses
are prevented from writing to the filesystem. Normally,
the default percentage of reserved blocks is 5%.
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