Hi Everyone,
In the GPFS documentation
(http://www.ibm.com/support/knowledgecenter/SSFKCN_4.1.0/com.ibm.cluster.gpfs.v4r1.gpfs300.doc/bl1ins_migratl.htm)
it has this to say about the duration of an upgrade from 3.5 to 4.1:
Rolling upgrades allow you to install new GPFS code one node at a time without
shutting down GPFS
on other nodes. However, you must upgrade all nodes within a short time. The
time dependency exists
because some GPFS 4.1 features become available on each node as soon as
the node is upgraded, while
other features will not become available until you upgrade all
participating nodes.
Does anyone have a feel for what "a short time" means? I'm looking to
upgrade from 3.5.0.31 to 4.1.1.10 in a rolling fashion but given the
size of our system it might take several weeks to complete. Seeing this
language concerns me that after some period of time something bad is
going to happen, but I don't know what that period of time is.
Also, if anyone has done a rolling 3.5 to 4.1 upgrade and has any
anecdotes they'd like to share, I would like to hear them.
Thanks!
-Aaron
--
Aaron Knister
NASA Center for Climate Simulation (Code 606.2)
Goddard Space Flight Center
(301) 286-2776
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