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List:       toasters
Subject:    Re: quota limits
From:       Chris Thompson <cet1 () cus ! cam ! ac ! uk>
Date:       2001-02-28 16:13:10
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tmac@netapp.com (Tim McCarthy) writes
> 
> Something like this should do:
> 
> /etc/quotas
> /vol/vol0/qtree2g     tree                    2G
> #Establish a 2G limit for your special qtree
> 
> user1                 user@/vol/vol0/qtree2g  2G
> user2                 user@/vol/vol0/qtree2g  2G
> user3                 user@/vol/vol0/qtree2g  2G
> user4                 user@/vol/vol0/qtree2g  2G
> *                     user@/vol/vol0/qtree2g  0M
> #Give your special users a 2G limit inside the special qtree
> #Give everyone else no limit in the special qtree
> 
> *                     user                    200M
> #Give all users a 200MB limit on the rest of the volume

No, that won't apply to "the rest of the volume", but to the whole
of it. For files owned by user1 inside /qtree2g, *each* of the 
following quotas will apply:

   1. the 2G tree quota for /qtree2g
   2. the 2G quota for user1 inside /qtree2g
   3. the 200M quota for user1 on the whole volume /vol/vol0

and of course (3) will always bite before (2).

For this reason (among others) it's desirable to put everything inside
qtrees whenever possible. I try to arrange that only /etc is not in a 
qtree on my volumes. Thus if the 200 MB limit was meant to apply only 
to "home directories", and they had all been put inside a qtree /home, 
then 

  *                     user@/home              200M

would provide a control that was independent of those on /qtree2g.

Of course, if the original poster has allocated his home directories
outside any qtree, it may be a substantial chore for him to get them 
all reallocated inside a qtree, as a lot of data movement could be 
involved. 

If one could have quotas that applied only to "qtree 0" (in the sense 
of the na_qtree man page) then that would solve his problem, but AFAIK
this is not currently possible in ONTAP.

> #And hey, just for kicks:
> *                     tree@/vol/vol0/         *
                                                ^ should be "-" ?
> #a default tree quota for vol0. If you add more
> #qtrees, simply add it to this quotas file
> #and do a quota resize

That's certainly what I have done since that facility became available
(5.3.4 or thereabouts).

BTW, I've been assuming that /vol/vol0 is the root volume above. In which,
case the entries in /etc/quotas do not have to mention it explicitly after
the "@"s, as it is the default.

Chris Thompson               University of Cambridge Computing Service,
Email: cet1@ucs.cam.ac.uk    New Museums Site, Cambridge CB2 3QG,
Phone: +44 1223 334715       United Kingdom.

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