Why?? NFS cached permissions groups etc

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An hour of my life disapeared and my beautiful uptime was rebooted and it was
fixed by reading
http://serverfault.com/questions/98900/is-a-reboot-required-to-refresh-permissio
ns-after-adding-a-user-to-a-new-group

#/home is mounted from a NFS export
[jpyeron@node000 ~]$ cat /tmp/jobs/foo.txt ~jobs/test.txt ~jobs/userstest.txt
afasdasd

cat: /home/jobs/test.txt: Permission denied
Sun May  5 03:20:36 EDT 2013


#### why does this fix the issue?
[jpyeron@node000 ~]$ newgrp jobs




[jpyeron@node000 ~]$ cat /tmp/jobs/foo.txt ~jobs/test.txt ~jobs/userstest.txt
afasdasd

Sun May  5 02:27:17 EDT 2013
Sun May  5 03:20:36 EDT 2013
[jpyeron@node000 ~]$




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- Jason Pyeron                      PD Inc. http://www.pdinc.us -
- Principal Consultant              10 West 24th Street #100    -
- +1 (443) 269-1555 x333            Baltimore, Maryland 21218   -
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This message is copyright PD Inc, subject to license 20080407P00.


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