Re: Per-User QUOTA's vs blocksize

From: Stacey Roberts (stacey_at_vickiandstacey.com)
Date: 03/10/04

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    Date: Wed, 10 Mar 2004 18:53:17 +0000
To: Scott Mitchell <scott+freebsd@fishballoon.org>

    Hello,

    ----- Original Message -----
    From: "Scott Mitchell <scott+freebsd@fishballoon.org>"
    To: To Matthew Seaman
    Date: Wed, 10 Mar, 2004 09:56 GMT
    Subject: Re: Per-User QUOTA's vs blocksize

    > On Tue, Mar 09, 2004 at 02:05:54PM +0000, Matthew Seaman wrote:
    > > On Mon, Mar 08, 2004 at 06:48:51PM +0000, Stacey Roberts wrote:
    > >
    > > > "You may limit allocations based on disk space (block quotas)"
    > > >
    > > > What exactly is the size of a block?
    > >
    > > As the quota system uses the term, a block is 512b -- this unit is
    > > also called a sector in some situations, but it's basically the same
    > > thing. It reflects the size of the underlying sector structures
    > > within the filesystem.
    >
    > True, but the term is used inappropriately by the quota tools and their
    > documentation - these appear to work exclusively in KB units for their
    > (ahem) 'block' quotas, at least on recent versions on FreeBSD.
    >
    > See, for example, rev. 1.18 of edquota.c and the associated PR:
    > http://www.freebsd.org/cgi/cvsweb.cgi/src/usr.sbin/edquota/edquota.c?rev=1.18&content-type=text/x-cvsweb-markup
    > http://www.freebsd.org/cgi/query-pr.cgi?pr=41936

    This is crazy.., there's not one iota on attempting to clarify this in the online HandBook.
    >
    > There's a lot of explicit [some number of bytes]/1024 calculations in the
    > various quota tools.
    >
    > I have empirical evidence of this too - I set up 'block' quotas for my
    > users many moons ago, assuming 512 byte blocks. I was then quite surprised
    > to run out of disk space last weekend, with du(1) showing several users
    > massively over quota, but repquota(8) saying all was well. Halving all the
    > quota settings keeps everything in agreement.
    >
    > The documentation is certainly misleading on this point. I'll file a PR,
    > unless anyone cares to beat me to it...

    I'll submit a PR now..,

    Thanks for this.

    Regards,

    Stacey

    >
    > Scott
    >
    > --
    > ===========================================================================
    > Scott Mitchell | PGP Key ID | "Eagles may soar, but weasels
    > Cambridge, England | 0x54B171B9 | don't get sucked into jet engines"
    > scott at fishballoon.org | 0xAA775B8B | -- Anon
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    -- 
Stacey Roberts
B. Sc (HONS) Computer Science
Web: www.vickiandstacey.com

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