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configured cluster name. If the names do not match, no node IP addresses are returned in the

response.

If Scsp-Proxy-Cluster is not present, the request uses the configured cluster name and the list of

node IP addresses reflects the currently known node IPs for that cluster.

In either case, the response metadata includes a response header with the same name containing

the cluster name used by the Proxy.

1.1.1.2. Response Headers

The following table discusses response headers:

Response

Scsp-Proxy-Cluster

Scsp-Proxy-Nodes

Scsp-Proxy-Agent

Castor-System-

TotalGBAvailable, Castor-

System-TotalGBCapacity

For example, the following response indicates there are 10 nodes in the cluster:

Scsp-Proxy-Nodes: count=10

If the response indicates zero nodes in the cluster, it is accompanied by a reason, as follows:

Scsp-Proxy-Nodes: count=0, reason=no-nodes

The following table discusses reason codes.

Reason for empty node list

no-nodes

bad-subnet

bad-cluster

Description

Cluster name (for example, if the cluster is configured on

a CSN, it is the value of scsp.clusterName in /etc/

caringo/scspproxy/scspproxy.cfg).

ASCII string count of the number of node IP addresses

returned in the body of the response. If this count is zero,

an additional reason is supplied to explain why there were

no nodes returned. More information about the zero-node

response is discussed following the table.

Proxy and its software version.

Obtained by polling any available node on the local

cluster. These headers are provided to maintain

consistency with current Proxy and DX Storage

responses.

Meaning

The Proxy reports no nodes when, for example, the cluster is

off-line or is being rebooted.

The request was made from a subnet from which the node IP

addresses are not routable.

The Proxy determines whether or not a request originated from

the same private subnet as its cluster and responds only if the

request did originate in that subnet. The Proxy does this to help

prevent malicious discovery about the cluster and because

private IP addresses are not routable anyway.

The cluster name supplied in the Scsp-Proxy-Cluster

header did not match the currently configured cluster.

Version 1.2

December 2010