[gpfsug-discuss] Adding ESS to existing Scale Cluster
RICHARD RUPP
richard.rupp at us.ibm.com
Sun Apr 7 16:26:14 BST 2019
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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