On Tue, 12 Feb 2008, Kit Westneat wrote:
> What the group upcall does is get all the secondary groups for the client
> user. There isn't enough room in the LNET message to send them all, so the MDS
> has to look it up in the /etc/groups. If you don't care about secondary groups
> at all, there is no harm in clearing the group_upcall param.
>
> In theory, there also shouldn't be any harm in having different passwd and
> group files on the MDS and OSSes than on the clients. It's highly important,
> however, that all the clients have the same passwd and groups files. Otherwise
> the clients could interpret the same UID as different users, and people could
> go mucking around in each others files.
ok, thanks for clarifying this
/Per
--
Per Lundqvist
National Supercomputer Centre
Linköping University, Sweden
http://www.nsc.liu.se
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