[gpfsug-discuss] afmHashVersion

[Venkateswara R Puvvada]

afmHashVersion=5 does not cause any performance degradation, this hash 
version allows assigning a gateway for the fileset using mmchfileset 
command.  This option is not required for AFM home cluster(assuming that 
home is not a cache for other home). It is needed only at the AFM cache 
cluster  and at client cluster if it remote mounts the AFM cache cluster. 
For changing afmHashVersion=5, all the nodes in the  AFM cache and client 
cluster have to be upgraded to the minimum 5.0.2 level. This option cannot 
be set dynamically using -i/-I option, all the nodes in the both AFM cache 
and client clusters have to be shutdown to set this option. It is 
recommended to use 5.0.4-3 or later. 

https://www.ibm.com/support/knowledgecenter/STXKQY_5.0.2/com.ibm.spectrum.scale.v5r02.doc/bl1adm_mmchconfig.htm

~Venkat (vpuvvada at in.ibm.com)



From:   leslie elliott <leslie.james.elliott at gmail.com>
To:     gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Date:   04/04/2020 11:30 AM
Subject:        [EXTERNAL] [gpfsug-discuss] afmHashVersion
Sent by:        gpfsug-discuss-bounces at spectrumscale.org




I was wondering if there was any more information on the different values 
for 
afmHashVersion 

the default value is 2 but if we want to assign an afmGateway to  
a fileset we need a value of 5 

is there likely to be any performance degradation because of this change 

do the home cluster and the cache cluster both have to be set to 5 for 
the 
fileset allocation to gateways

just trying to find a little more information before we try this on a 
production 
system with a large number of afm independent filesets 

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