[lug] mke2fs

[Hugh Brown]

On Thu, 2002-11-21 at 23:10, Prafulla Harpanhalli wrote:
> depends on how we, as a sysadd, take it. in many cases
> df -h shows 100% disk utilization on the drive where /
> is mounted. but, some services, like xfs, run as root
> & needs some space on the partition.
> 
> there are many other similar intricacies involved, i
> mentioned just one. i had a similar problem which said
> "could'nt start x font server" & my x used to crash.
> it took a bit of time to make out the problem. so its
> better if we leave it the default value.
> 

Interesting point.  When mke2fs creates a partition for use, it doesn't
use all of the available blocks.  e.g.

Filesystem   1k-blocks    Used   Available Use% Mounted on
/dev/hdc1    76920416  39533536  35823920  52% /mnt/new

Usually people discover this by noticing that 1k-blocks - (Used +
Available) > 0

76920416 - (39533536 + 35823920) = 1562960 which is 1.5 gig.

If I accept the default, the Used + Available is 95% of the 1k-blocks
and I have 3gigs that root can still use to write to the partition when
non-root users are told the device is full.

This is moot since it is not going to be a / partition, but I'm not
aware of any root process that requires 3gig free in order to start
(e.g. xfs, and others).  Also, if my / is showing 100%, I have either
been careless to let if fill up gradually, or there is a runaway process
that has filled it up and probably filled up the entire partition not
just the user available portion.

Hugh






> HTH
> 
> --- "D. Stimits" <stimits at attbi.com> wrote:
> > Hugh Brown wrote:
> > 
> > > I have an 80 gig disk and cringe a little that
> > 3gig is being reserved
> > > for use by the super user.
> > >
> > > Is there a problem if instead of 5% I set it to
> > 2%?
> > >
> > > What's the downside, if any, of doing this?
> > >
> > > Hugh
> > >
> > >
> > I don't personally know of a downside for
> > that...doesn't mean there 
> > isn't one...but on a drive that large I suspect 2%
> > is enough.
> > 
> > D. Stimits, stimits AT attbi.com
> > 
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> 
> =====
> __Prafulla__
> 
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