[gpfsug-discuss] quota on secondary groups for a user?

[Sven Oehme]

i can't contribute much to the usefulness of tracking primary or secondary
group. depending on who you ask you get a 50/50 answer why its great or
broken either way.
Jonathan explanation was correct, we only track/enforce primary groups , we
don't do anything with secondary groups in regards to quotas.
if there is 'doubt' of correct quotation of files on the disk in the
filesystem one could always run mmcheckquota, its i/o intensive but will
match quota usage of the in memory 'assumption' and update it from the
actual data thats stored on disk.

sven


On Wed, Aug 3, 2016 at 12:18 PM, Buterbaugh, Kevin L <
Kevin.Buterbaugh at vanderbilt.edu> wrote:

> JAB,
>
> Our scratch filesystem uses user and group quotas.  It started out as a
> traditional scratch filesystem but then we decided (for better or worse) to
> allow groups to purchase quota on it (and we don’t purge it, as many sites
> do).
>
> We have many users in multiple groups, so if this is not working right
> it’s a potential issue for us.  But you’re right, I’m a nobody…
>
> Kevin
>
> On Aug 3, 2016, at 2:13 PM, Jonathan Buzzard <jonathan at buzzard.me.uk>
> wrote:
>
> On 03/08/16 19:34, Buterbaugh, Kevin L wrote:
>
> Hi Jaime / Sven,
>
> If Jaime’s interpretation is correct about user1 continuing to be able
> to write to “group2” files even though that group is at their hard
> limit, then that’s a bug that needs fixing.  I haven’t tested that
> myself, and we’re in a downtime right now so I’m a tad bit busy, but if
> I need to I’ll test it on our test cluster later this week.
>
>
> Even if Jamie's interpretation is wrong it shows the other massive failure
> of group quotas under Unix and why they are not fit for purpose in the real
> world.
>
> So bufh here can deliberately or accidentally do a denial of service on
> other users and tracking down the offending user is a right pain in the
> backside.
>
> The point of being able to change group ownership on a file is to indicate
> the massive weakness of the whole group quota system, and why in my
> experience nobody actually uses it, and "project" quota options have been
> implemented in many "enterprise" Unix file systems.
>
> JAB.
>
> --
> Jonathan A. Buzzard                 Email: jonathan (at) buzzard.me.uk
> Fife, United Kingdom.
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>
> —
> Kevin Buterbaugh - Senior System Administrator
> Vanderbilt University - Advanced Computing Center for Research and
> Education
> Kevin.Buterbaugh at vanderbilt.edu - (615)875-9633
>
>
>
>
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