[gpfsug-discuss] Adding ESS to existing Scale Cluster

[RICHARD RUPP]

This has been publically documented in the Spectrum Scale FAQ Q13.17,
Q13.18 and Q13.19.

Regards,

Richard Rupp, Sales Specialist, Phone: 1-347-510-6746




From:	"Daniel Kidger" <daniel.kidger at uk.ibm.com>
To:	"gpfsug main discussion list"
            <gpfsug-discuss at spectrumscale.org>
Date:	04/06/2019 10:12 AM
Subject:	Re: [gpfsug-discuss] Adding ESS to existing Scale Cluster
Sent by:	gpfsug-discuss-bounces at spectrumscale.org



There is a non-technical issue you may need to consider.
IBM has set licensing rules about mixing in the same Spectrum Scale cluster
both ESS from IBM and 3rd party storage that is licensed under ESA/OEM
(Lenovo, DDN, Bull, Pixit et al.).

I am sure Carl Zetie or other IBMers who watch this list can explain the
exact restrictions.

Daniel

_________________________________________________________
Daniel Kidger
IBM Technical Sales Specialist
Spectrum Scale, Spectrum NAS and IBM Cloud Object Store

+44-(0)7818 522 266
daniel.kidger at uk.ibm.com
                                     
                                     
                                     




On 3 Apr 2019, at 19:47, Sanchez, Paul <Paul.Sanchez at deshaw.com> wrote:

            note though you can't have GNR based vdisks (ESS/DSS-G) in the
            same storage pool.

      At one time there was definitely a warning from IBM in the docs about
      not mixing big-endian and little-endian GNR in the same
      cluster/filesystem.   But at least since Nov 2017, IBM has published
      videos showing clusters containing both.  (In my opinion, they had to
      support this because they changed the endian-ness of the ESS from BE
      to LE.)

      I don't know about all ancillary components (e.g. GUI) but as for
      Scale itself, I can confirm that filesystems can contain NSDs which
      are provided by ESS(BE), ESS(LE), GSS, and DSS in all combinations,
      along with SAN storage based NSD servers.  We typically do rolling
      upgrades of GNR building blocks by adding blocks to an existing
      cluster, emptying and removing the existing blocks, upgrading those
      in isolation, then repeating with the next cluster.  As a result, we
      have had every combination in play at some point in time.  Care just
      needs to be taken with nodeclass naming and mmchconfig parameters.
      (We derive the correct params for each new building block from its
      final config after upgrading/testing it in isolation.)

      -Paul

      -----Original Message-----
      From: gpfsug-discuss-bounces at spectrumscale.org <
      gpfsug-discuss-bounces at spectrumscale.org> On Behalf Of Simon Thompson
      Sent: Wednesday, April 3, 2019 12:18 PM
      To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
      Subject: Re: [gpfsug-discuss] Adding ESS to existing Scale Cluster

      We have DSS-G (Lenovo equivalent) in the same cluster as other SAN/IB
      storage (IBM, DDN). But we don't have them in the same file-system.

      In theory as a different pool it should work, note though you can't
      have GNR based vdisks (ESS/DSS-G) in the same storage pool.

      And if you want to move to new block size or v5 variable sunblocks
      then you are going to have to have a new filesystem and copy data. So
      it depends what your endgame is really. We just did such a process
      and one of my colleagues is going to talk about it at the London user
      group in May.

      Simon
      ________________________________________
      From: gpfsug-discuss-bounces at spectrumscale.org [
      gpfsug-discuss-bounces at spectrumscale.org] on behalf of
      prasad.surampudi at theatsgroup.com [prasad.surampudi at theatsgroup.com]
      Sent: 03 April 2019 17:12
      To: gpfsug-discuss at spectrumscale.org
      Subject: [gpfsug-discuss] Adding ESS to existing Scale Cluster

      We are planning to add an ESS GL6 system to our existing Spectrum
      Scale cluster. Can the ESS nodes be added to existing scale cluster
      without changing existing cluster name? Or do we need to create a new
      scale cluster with ESS and import existing filesystems into the new
      ESS cluster?

      Prasad Surampudi
      Sr. Systems Engineer
      The ATS Group





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