Configure multi-node simultaneous transfers

The Transfer CFT session management in a multi-node architecture differs from a standalone implementation. This section describes parameters you can use to customize a multi-node environment, and offers some recommendations.

Note The diag 916 and 418 errors relate to these settings. See DIAGI: Diagnostic codes .

Global settings

The MAXCNX and MAXTRANS parameters control the Transfer CFT maximum number of simultaneous connections and authorized parallel transfers respectively. It is important to remember that the MAXCNX and MAXTRANS values in a multi-node architecture apply to each node. This means that if there are 3 nodes, multiply the MAXCNX value by 3 to have the actual value for that Transfer CFT.

If you have limited resources, set the MAXTRANS to a low value. If resources are not limited, a rule of thumb might be to set MAXTRANS to the sum of all partner CNXINOUT values (maximum value of 1000).

See also Configuring simultaneous transfers.

Session parameters

Use the CNXIN, CNXOUT and CNXINOUT parameters in CFTTCP to define the number of sessions.

Multi-node to stand alone

For a multi-node Transfer CFT exchanging with a standalone Transfer CFT, use the following table to determine settings.

Multi-node Stand alone
CNXOUT = (remote partner’s CNXIN) / number of nodes CNXIN = (remote partner’s CNXOUT) x number of nodes on the remote site
CNXIN = (remote partner’s CNXOUT) CNXOUT = (remote partner’s CNXIN)
CNXINOUT <= CNXIN+CNXOUT CNXINOUT <= CNXIN+CNXOUT

Multi-node to multi-node

The following multi-node to multi-node Transfer CFT recommendations are for a heavily loaded configuration, in order to avoid lagging performance (and reduce 916 and 418 errors in the production logs).

Multi-node Multi-node
CNXOUT = (remote partner’s CNXIN) / number of nodes on the remote site CNXIN = (remote partner’s CNXOUT) x number of nodes on the remote site
CNXIN = (remote partner’s CNXOUT) x number of nodes on the remote site CNXOUT = (remote partner’s CNXIN) / number of nodes on the remote site
CNXINOUT = CNXIN+CNXOUT CNXINOUT = CNXIN+CNXOUT

Related topics

About multi-node architecture

Related Links