Ok, Cheers for the advice. Will do.
On 21/07/2011 15:40, Stuart Purdie wrote:
> On 21 Jul 2011, at 15:22, Adam Davison wrote:
>> We're setting up our CREAM CE to interact with a central university run cluster, which uses SGE if that makes any difference.
>> We've been assigned some slightly random set of non-sequential UIDs for our pool accounts. Does anyone know if you need to use the same UIDs for the pool accounts on the CE or does it make no difference?
> It's a lot easier if they are the same; and are often reuired to be.
> The LRMS (a.k.a. batch system) has to move output data files from the worker node back to the CE. This is normally done via rcp/scp and host.equiv type mechanisms, which require the UID's to be the same on the worker nodes and the CE's.
> It is possible to set up a cluster to use other mechanisms; but most of them use the same UID matching. To avoid UID matching, you need a way to move files in an authenticated manner, and apply ACL's, other wise one users jobs could access/delete data belonging to another user. Given that POSIX does that, if you match UID's, it's the easy way.
> In short: I'd match them, even if it's a hassle.