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There is definitely a change in behavior between 4.2.3 and 5.0.x.
When verbs send is disabled, the behavior of nsdInlineWriteMax 5.0 works the same as 4.2.3. If data length is bigger than this configuration, data will be sent through getData RPC or RDMA, otherwise the data will be sent inline in RPC message
When verbs send is enabled, the nsdInlineWriteMax configuration is ignored, because we have another configuration that controls the verbs send length limit - verbsRecvBufferSize. If the NSD data length is bigger than (verbsRecvBuffeSize - 128), the data will be sent through RDMA, otherwise, the data will be sent inline by verbs send.
Can you please let me know if this addresses the issue?
Due to processing by IBM, this request was reassigned to have the following updated attributes:
Brand - Servers and Systems Software
Product family - IBM Spectrum Scale
Product - Spectrum Scale (formerly known as GPFS) - Public RFEs
Component - Product functionality
For recording keeping, the previous attributes were:
Brand - Servers and Systems Software
Product family - IBM Spectrum Scale
Product - Spectrum Scale (formerly known as GPFS) - Public RFEs
Component - V4 Product functionality