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

[Buterbaugh, Kevin L]

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<mailto: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<http://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<mailto:Kevin.Buterbaugh at vanderbilt.edu> - (615)875-9633



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