On 1/8/09, Bill Sommerfeld <sommerf...@sun.com> wrote:
>
>
> On Tue, 2009-01-06 at 22:18 -0700, Neil Perrin wrote:
> > I vaguely remember a time when UFS had limits to prevent
> > ordinary users from consuming past a certain limit, allowing
> > only the super-user to use it. Not that I'm advocating that
> > approach for ZFS.
man page of newfs, on Solaris 8 (5.8), gives the option:
-m free
The minimum percentage of free space to maintain
in the file system (between 1% and 99%,
inclusively). This space is off-limits to normal
users. Once the file system is filled to this
threshold, only the super-user can continue
writing to the file system. This parameter can
be subsequently changed using the tunefs(1M)
command.
The default is ((64 Mbytes/partition size) *
100), rounded down to the nearest integer and
limited between 1% and 10%, inclusively.
We always kept it to 1 % but were very glad to have it when, for any reason,
the users had nothing left... I should add that we were running most of the
time above 90 % (it is just thermodynamic, gas occupy all available space!)
and could not see any real slowdown between 40 % and 99 % full (ufs+logging
on sparc Solaris 8).
Paul
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