[gpfsug-discuss] Spectrum Scale (GPFS) FAQ - Maximum number of remote clusters accessing a given cluster

[Tomer Perry]

Hans-Joachim,

Since I'm the one that gave this answer...I'll work on adding it to the 
FAQ.

But, in general:
1. The maximum number of "outbound clusters" - meaning "how many clusters 
can a client join - is limited to 31 ( 32 including the local cluster)
2. The maximum number or "inbound cluster" - meaning "how many clusters 
can join my cluster) - is not really limited. Thus, since the smallest 
cluster possible is a single node cluster, it means that 16383 nodes can 
join my cluster ( 16384 - 1).


Regards,

Tomer Perry
Scalable I/O Development (Spectrum Scale)
email: tomp at il.ibm.com
1 Azrieli Center, Tel Aviv 67021, Israel
Global Tel:    +1 720 3422758
Israel Tel:      +972 3 9188625
Mobile:         +972 52 2554625




From:   Hans-Joachim Ehlers <service at metamodul.com>
To:     gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Date:   28/02/2017 10:44
Subject:        [gpfsug-discuss] Spectrum Scale (GPFS) FAQ - Maximum 
number of remote clusters accessing a given cluster
Sent by:        gpfsug-discuss-bounces at spectrumscale.org



First thx to all for the support on this list. It is highly appreciated.
My new question:
i have currently with IBM a discussion about the maximum number of remote 
clusters mounting GPFS from a local cluster.
The answer was that there is almost no limit to the amount of REMOTE 
clusters accessing a given cluster. From memory I thought there was a 
limit of 24 remote clusters and the total amount of node must not exceed 
16k nodes. The later is described in the GPFS FAQ but about the maximum 
number of remote cluster accessing a local cluster I could not find 
anything within the FAQ.
So is there a limit of remote clusters accessing a given GPFS cluster or 
could I really have almost 16k-n(*) remote clusters ( One node cluster ) 
as long as the max amount of nodes does not exceed the 16K ?
(*) n is the amount of local nodes.
Maybe this info should be added also to the FAQ ?

Info from the FAQ:
https://www.ibm.com/support/knowledgecenter/SSFKCN/com.ibm.cluster.gpfs.doc/gpfs_faqs/gpfsclustersfaq.pdf
Q5.4: What is the current limit on the number of nodes that may 
concurrently join a cluster?
A5.4: As of GPFS V3.4.0.18 and GPFS V3.5.0.5, the total number of nodes 
that may concurrently join a
cluster is limited to a maximum of 16384 nodes.

tia
Hajo
-- 
Unix Systems Engineer 
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