[gpfsug-discuss] GPFS 3.5 to 4.1 Upgrade Question

Aaron Knister aaron.s.knister at nasa.gov
Mon Dec 5 21:31:55 GMT 2016


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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