I have to admit, setting up space tokens is a pain and we would prefer
if VOs *didn't* insist on spacetokens for our site.
Now if they really have their heart set on one we'll make one, but
they might get more storage space if they use the "group space" rather
than insisting on having their own space.
t2k is special as the amount of space they use at IC is substantial
and doesn't really come under the 'small VO' remit.
Cheers,
Daniela
On 26 January 2012 09:36, Sam Skipsey <[log in to unmask]> wrote:
>
>
> On 25 January 2012 22:42, Christopher J. Walker <[log in to unmask]>
> wrote:
>>
>> At the storage group this morning, t2k.org was discussed. The discussion
>> about t2k.org and space tokens has been rumbling on and seems to have fallen
>> between various cracks.
>>
>> I proposed (and people seemed to agree) that the storage group has more
>> expertise than T2k.org - so we should give them some advice on what they -
>> and see if that fits for them.
>>
>> The problem is that T2K.org wants to store significant quantities of data
>> at sites - and this has filled the non space token space at various sites.
>> These recommendations will apply to other similar VOs (eg snoplus).
>> Different recommendations may apply to smaller VOs wanting to store
>> transient job outputs.
>>
>>
>>
>> The consensus seemed to be:
>>
>> 1) T2k.org (and other similar VOs) should use space tokens at UK grid
>> sites in order to allow sites and the VO to manage the space available to
>> the VO.
>>
>> Note, some concern was expressed about the ability of non UK sites to
>> implement this. We need to work out what the concern is, and whether it is
>> actually a problem.
>
>
> I am a little confused by how implementation of spacetokens could be a
> blocking issue; all three commonly used storage elements provide spacetokens
> (although I believe dCache does them in a slightly less agile way than DPM
> and StoRM).
>
>>
>>
>> Note2: Multiple space tokens were not discussed in the meeting - and
>> different SRM implementations differ, but ATLAS uses spacetokens to prevent
>> normal users from deleting data that isn't theirs (which could happen by
>> accident rather than design).
>>
>> 2) Sites should set up a spacetoken for t2k.org
>>
>> 3) How do we move data into these space tokens? A DPM tool has been on the
>> cards for some time, but hasn't yet been written. Unless it appears in a
>> couple of weeks, t2k should just get on with it - deleting the data and
>> copying it in again won't take huge amounts of time - the quantities are
>> relatively small compared to the LHC VOs. Quite frankly we should just get
>> on with this.
>>
>
> Yes. (With the caveat that, if the beta tool that Matt got sent seems to
> work okay before t2k start moving stuff, we could easily switch back to
> using it.)
>
>>
>> Thoughts?
>>
>> Chris
>
>
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