[gpfsug-discuss] A net new cluster

[Christopher Black]

I suggest option A.
We are facing a similar transition and are going with a new cluster and then 4.x cluster to 5.x cluster migration of existing data. An extra wrinkle for us is we are going to join some of the old hardware to the new cluster once it is free of serving current data.
Main reasoning of the new cluster for us is to be able to make a fully V19+ filesystem with sub-block allocation.
Our understanding from talking to IBM is that there is no way to upgrade a pool to be SBA-compatible, nor is it advisable to try to create a new pool or filesystem in same cluster and then migrate (partially because migrating between filesystems within a cluster with afm would require going through nfs stack afaik).
Option B would be much less work and work fine if you are not concerned with things like sub-block allocation that can’t be gained easily with an in-place upgrade.

Best,
Chris

From: <gpfsug-discuss-bounces at spectrumscale.org> on behalf of Mark Bush <Mark.Bush at siriuscom.com>
Reply-To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Date: Friday, March 29, 2019 at 12:11 PM
To: "gpfsug-discuss at spectrumscale.org" <gpfsug-discuss at spectrumscale.org>
Subject: [gpfsug-discuss] A net new cluster

So I have an ESS today and it’s nearing end of life (just our own timeline/depreciation etc) and I will be purchasing a new ESS.  I’m working through the logistics of this.  Here is my thinking so far:
This is just a big Data Lake and not an HPC environment

Option A
Purchase new ESS and set it up as a new cluster
Remote mount old cluster and copy data (rsync or AFM)

Option B
Purchase new ESS and set it up to join the old cluster same filesystems
Evacuate old NSDs and expel Old nodes

Option C
Purchase new ESS and set it up as a new cluster
Point all new data to new cluster and age out old cluster over time (leverage TCT or Archive)


Any/All feedback welcome

Mark

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