ICAP servers

The number of ICAP servers that are required to support an Isilon cluster depends on how virus scanning is configured, the amount of data a cluster processes, and the processing power of the ICAP servers.

If you intend to scan files exclusively through antivirus scan policies, it is recommended that you have a minimum of two ICAP servers per cluster. If you intend to scan files on access, it is recommended that you have at least one ICAP server for each node in the cluster.

If you configure more than one ICAP server for a cluster, it is important to ensure that the processing power of each ICAP server is relatively equal. OneFS distributes files to the ICAP servers on a rotating basis, regardless of the processing power of the ICAP servers. If one server is significantly more powerful than another, OneFS does not send more files to the more powerful server.

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When files are sent from the cluster to an ICAP server, they are sent across the network in cleartext. Make sure that the path from the cluster to the ICAP server is on a trusted network.