On 01/11/11 14:43, Ewan MacMahon wrote:
>> -----Original Message-----
>> From: Emyr James [mailto:[log in to unmask]]
>> Sent: 01 November 2011 14:39
>>
>> On 01/11/11 14:30, Ewan MacMahon wrote:
>>> The common approach is to have per-node home directories on each
>>> worker node's local disk, so they're effectively scratch space. There
>>> are other approaches available depending on what storage you have
>>> where.
>> We have about 400GB local scratch space on each node. Will this be enough
>> ?
>
> Strictly speaking I believe the ATLAS specification is to 50Gb
> per job slot, but they rarely seem to actually use anywhere near
> that much. So probably yes. How many job slots are in each node?
That requirement is based on staging data to the worker node. As Sussex
is using StoRM, they won't need to do that, so the requirement will be
much less. Exactly how much less, I've never managed to establish.
QMUL has 500Gig drives on our dual x5650 machines - so a similar amount
of swap space and we haven't had problems due to this, so I'd advise
local scratch.
Chris
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