HP Cisco MDS 9020 Cisco MDS 9000 Family Storage Media Encryption Configuration - Page 27
In-Service Software Upgrade in Cisco SME
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Chapter 1 Product Overview About Cisco Storage Media Encryption Send documentation comments to [email protected] Figure 1-3 Cisco Storage Media Encryption: Single-Fabric Topology Application servers Email Server HR Server MDS switch running SAN-OS 3.2 Cisco MDS 9500 Series Cisco MDS 9200 Series MSM-18/4 module switch with SME enabled (cluster mode) Encryption Compression Email tape library Tape libraries HR tape library 183939 Note Tape devices should be connected to core switches such as an MDS 9500 Series switch or an MDS 9216 or MDS 9222i switch running Cisco SAN-OS Release 3.2(2c) or later, or Cisco NX-OS 4.x. Encryption and compression services are transparent to the hosts and storage devices. These services are available for devices in any virtual SANs (VSANs) in a physical fabric and can be used without rezoning. In-Service Software Upgrade in Cisco SME In-Service Software Upgrade (ISSU) is a comprehensive, transparent software upgrade capability that allows you to add new features and services without any disruption to the traffic. In a cluster, which has the MDS 9222i switch as nodes, if the nodes are not able to communicate, then the node having the lowest node identifier (node ID) remains in the cluster while the other node leaves the cluster. However, when an ISSU is performed on a node having the lowest node identifier, a complete loss of the cluster results since both the nodes leave the cluster. This undesirable situation is addressed in a two-node cluster as follows: • The upgrading node sends a message to the other node of the intent to leave the cluster. The upgrading node can either be a master node or a slave node. • The remaining node remains in the cluster and performs the role of the master node if it was a slave node. This node continues to remain in the cluster with the quorum intact. • After the ISSU is completed and the switches boots up, the upgraded node rejoins the cluster as a slave node. OL-18091-01, Cisco MDS NX-OS Release 4.x Cisco MDS 9000 Family Storage Media Encryption Configuration Guide 1-9