Enabling quotas on an already existing file system

[A.Fadyushin at it-centre.ru]

Yes, it is possible to use quotacheck on the filesystem which is mounted
in read-write mode. However, you should be sure that nobody is
performing write operations on the filesystem during the quotacheck run.
If there were write operations during the quotacheck run then the
filesystem usage data gathered by quotacheck may be incorrect for the
files affected by the write operations. For example, the sizes of the
changed files may be counted incorrectly, or some files created during
quotacheck may not be counted toward the user/group quotas at all, etc.

Alexey Fadyushin
Brainbench MVP for Linux.
http://www.brainbench.com

> -----Original Message-----
> From: redhat-list-bounces at redhat.com [mailto:redhat-list-
> bounces at redhat.com] On Behalf Of John O'Loughlin
> Sent: Tuesday, June 27, 2006 6:37 PM
> To: General Red Hat Linux discussion list
> Subject: Re: Enabling quotas on an already existing file system
> 
> 
> Actually ignore this, the -m option tells it not to remount read only.
> 
> John
> 
> On Tue, 27 Jun 2006, John O'Loughlin wrote:
> 
> >
> > Beware that quotacheck remounts the file system read only, so you
don't
> want
> > to do this when you have any users logged on.
> >
> > John
> >
> > On Tue, 27 Jun 2006, Padiyath Sreekumaran wrote:
> >
> >>
> >>  Hello,
> >>   OS : RedHat release 4
> >>
> >>   I have the following situation. At present I have a file system
> >>   Which is mounted without quota option and users are using it.
> >>   (/etc/fstab content:
> >>   /dev/vg00/ftp_data /data xfs  defaults  1 2)
> >>
> >>    I want to implement userquota on this file system. I would like
to
> >> know the following:
> >>
> >> 1. Can I implement quota on this file system?
> >> 2. If I can, Can I do the following:
> >>
> >>    a. unmount /data
> >>    b. mount with following command:
> >>        /dev/vg00/ftp_data /data xfs  defaults,usrquota  1 2
> >>
> >>    c.  quotacheck -avum
> >>
> >>    d.  quotaon -a
> >>
> >>    d.  then I will define the quota with "edquota username /data"
> >>
> >>
> >>
> >>     I donot know whether I have missed anything. I cannot make any
> >>     test on this production system.
> >>
> >>     Regards
> >>      Kumar
> >>
> >>
> >> ------------------------------------------------------------------
> >> Padiyath Sreekumar       |   Tel: +41.56.310.3643
> >> Paul Scherrer Institut   |   email: kumar.padiyath at psi.ch
> >> AIT                      |   Office: WHGA/U132
> >> WHGA/U132                |   Fax: +41.56.310.3649
> >> CH-5232 Villigen PSI     |
> >> Switzerland              |
> >> -----------------------------------------------------------------
> >>
> >>
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