[gpfsug-discuss] GPFS 3.5 to 4.1 Upgrade Question

[Steve Duersch]

You fit within the "short time".  The purpose of this remark is to make it
clear that this should not be a permanent stopping place.
Getting all nodes up to the same version is safer and allows for the use of
new features.


Steve Duersch
Spectrum Scale
845-433-7902
IBM Poughkeepsie, New York




gpfsug-discuss-bounces at spectrumscale.org wrote on 12/06/2016 02:25:18 AM:


>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 5 Dec 2016 16:31:55 -0500
> From: Aaron Knister <aaron.s.knister at nasa.gov>
> To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
> Subject: [gpfsug-discuss] GPFS 3.5 to 4.1 Upgrade Question
> Message-ID: <339e3bdb-b4cc-87af-a4a0-5b5b5a9f7269 at nasa.gov>
> Content-Type: text/plain; charset="utf-8"; format=flowed
>
> 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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