[gpfsug-discuss] Spectrum Scale Sizing Questions -> Typical size of descOnly NSD & Network latency/throughput requirements quorum-only node

[Sanchez, Paul]

Per  https://www.ibm.com/support/knowledgecenter/STXKQY_5.0.4/com.ibm.spectrum.scale.v5r04.doc/bl1ins_nsdfail.htm and confirmed by several instances in a live environment...

> This disk would exist solely to contain a replica of the file system descriptor (that is, it would not contain any file system metadata or data). This disk should be at least 128MB in size.

From: gpfsug-discuss-bounces at spectrumscale.org <gpfsug-discuss-bounces at spectrumscale.org> On Behalf Of Christoph Krafft
Sent: Friday, March 13, 2020 11:00
To: gpfsug-discuss at spectrumscale.org
Subject: [gpfsug-discuss] Spectrum Scale Sizing Questions -> Typical size of descOnly NSD & Network latency/throughput requirements quorum-only node


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Dear Spectrum Scale User Group,

can somebody please share with me answers to the following setup / architectural questions:

- What size is typically required for a descOnly NSD, that will only hold a copy of a filesystem descriptor area?

- Having a 2-node "core-cluster" and a quorum node at a third site with locally attached descOnly NSDs to that q-node.
What are the network latency / bandwidth requirements for traffic flowing between core-cluster-nodes and the q-node?
(from my understanding the traffic contains primarily mmfsd communication - including FS descOnly updates - but no data/metadata I/O)

Thank you in advance for answers - have a nice weekend.

Mit freundlichen Grüßen / Sincerely

Christoph Krafft

Client Technical Specialist - Power Systems, IBM Systems
Certified IT Specialist @ The Open Group

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