Hi Greig,
That is the main reason from my point of view. Currently at UCL-HEP, LCG
shares a partition with non-grid users. I am quite happy to move away
from this to have a dedicated LCG partition, but having to have a
separate partition for each VO is going to mean a lot of shuffling data
around, causing inconvenience for local non-grid users as well as taking
up scarce system administrator time. We will have to pick a size for our
ATLAS partition and then stick with it for the foreseeable future,
whereas with quotas we could be a bit more flexible and increase the
available space later if required.
The requirement for a separate partition for each VO also means we have
to choose between (a) setting up and maintaining extra dedicated pool
nodes for smaller VOs and (b) withdrawing support for those VOs. As
UCL-HEP is a small site compared to the main UCL-CENTRAL facility, this
might have a comparatively small effect on LCG as a whole. However, it
would be unfortunate if smaller sites were driven out of LCG by the
increasing hardware and administration required.
The extra flexibility provided by quotas seems to me to be a very strong
reason for supporting them. It would make administration a lot easier
and thus allow us to offer a better service.
Cheers,
Ben
Greig A Cowan wrote:
> Hi everyone,
>
> Can people respond with some examples of why they would like VO quotas in
> dCache or DPM? One reason is that it would allow us to let VO's share disk
> pools/filesystem but prevent them from using up all the space. This would
> mean that we could easily report the used and available space aswell.
>
> Can people think of other advantages?
>
> Cheers,
> Greig
>
--
Dr Ben Waugh Tel. +44 (0)20 7679 7223
Dept of Physics and Astronomy Internal: 37223
University College London
London WC1E 6BT
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