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S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m Cisco MDS 9000 Family I/O Accelerator Configuration Guide Cisco MDS NX-OS Release 5.0(1a)
Unified Acceleration Service Topology Independent Transport Agnostic High Availability and Resiliency Improved Tape Acceleration Performance Load Balancing Example IOA Topology Terminology Clustering Hardware Requirements Software Requirements License Requirements Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
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Task Flow for Converting an Existing IOA Cluster to use IPFC interface 2-13 Configuration Example for Converting IOA Cluster to Use the IPFC interface 2-13 Verifying the IOA Cluster Configuration 2-14 Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
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Enabling Clustering Enabling the IOA Service Classifying the Switches to IOA Sites Configuring IOA Interfaces Displaying IOA Interface Status Configuring an IOA Cluster Displaying IOA Cluster Status Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
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Launching IOA Manager Configuring Sites Adding a New Site Removing a Site Viewing a Site Adding Switches to a Site Removing Switches from a Site Configuring Clusters Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
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Single-Fabric Topology Cluster Recovery Scenarios Deleting an Offline Switch from a Cisco IOA Cluster Deleting a Cisco IOA Cluster with One or More Offline Switches while the Master Switch is Online Deleting a Cisco IOA Cluster when All Switches Are Offline...
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Fabric Manager Release 4.2(1) and later. To check for additional information about this release and to determine if this release supports I/O Accelerator, refer to the Cisco MDS 9000 Family Release Notes and Cisco Fabric Manager Release Notes available at the following Cisco Systems website: http://www.cisco.com/en/US/products/ps5989/prod_release_notes_list.html...
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S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m Cisco MDS 9000 Family I/O Accelerator Configuration Guide...
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m Preface This preface describes the audience, organization, and conventions of the Cisco MDS 9000 Family I/O Accelerator Configuration Guide. The preface also provides information on how to obtain related documentation.
Means reader be careful. In this situation, you might do something that could result in equipment damage or loss of data. Related Documentation The documentation set for the Cisco MDS 9000 Family includes the following documents. To find a document online, use the Cisco MDS NX-OS Documentation Locator at: http://www.cisco.com/en/US/docs/storage/san_switches/mds9000/roadmaps/doclocater.htm...
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m Cisco MDS 9000 Family NX-OS Intelligent Storage Services Configuration Guide • Cisco MDS 9000 Family NX-OS High Availability and Redundancy Configuration Guide • Cisco MDS 9000 Family NX-OS Inter-VSAN Routing Configuration Guide •...
Obtaining Documentation and Submitting a Service Request For information on obtaining documentation, submitting a service request, and gathering additional information, see the monthly What’s New in Cisco Product Documentation, which also lists all new and revised Cisco technical documentation, at: http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html...
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S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m Cisco MDS 9000 Family I/O Accelerator Configuration Guide...
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m C H A P T E R Overview This chapter provides an overview of the Cisco I/O Accelerator feature and includes the following sections: About Cisco I/O Accelerator, page 1-1 •...
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m the write acceleration and tape acceleration services on the Cisco MDS MSM-18/4 module, SSN-16 module, and 9222i switch as a fabric service.
Terminology The following Cisco IOA-related terms are used in this book: • Fabric—A physical topology of switches interconnected by Fibre Channel or FCIP ISLs.
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IOA cluster is being used for remote replication and backup, you can have all the replication flows classified into the replication flow group and all the backup flows classified into the backup flow group. Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
MDS 9222i Switch, and the 16-Port Storage Services Node (SSN-16) module. Each MSM-18/4 Module and 9222i Switch has one service engine that can be configured for the Cisco IOA service. The SSN-16 module has four service engines that can be used for the IOA service.
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m License Requirements The Cisco MDS 9000 Family IOA package is licensed per service engine and is tied to the chassis. The number of licenses required is equal to the number of service engines on which the intelligent fabric application is used.
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You can use the show license host-id command to find out which serial number to lock the license against. Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
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S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m Cisco MDS 9000 Family I/O Accelerator Configuration Guide...
Enables the use of the SSH service. switch(config)# feature ssh updated For more information about the SSH service, refer to the Cisco MDS 9000 Family NX-OS Security Configuration Guide. Enabling CFS CFS must be enabled on the IOA switches as well as those switches of which the hosts and targets are directly connected to.
Step 2 Enables (default) CFS distribution on the switch. switch(config)# cfs distribute For more information about CFS, refer to the Cisco MDS 9000 Family NX-OS System Management Configuration Guide. IP Access Lists Cluster communication requires the use of the Management interface. IP ACL configurations must allow UDP and TCP traffic on ports 9333, 9334, 9335, and 9336.
FC-Redirect configurations are deleted. FC-Redirect configurations can be deleted only by deleting all corresponding application configurations. The MDS switches not running Cisco NX-OS 3.3(1c) and later cannot be added to the fabric after the v2 mode is enabled. If the switches are added, all further FC-Redirect configuration changes will fail across the fabric.
SAN exceeds the scalability limit supported by IOA. As of MDS NX-OS Release 4.2(1), the number of switches supported in a fabric is 34. To learn more about CFS regions, refer to the Cisco MDS 9000 Family NX-OS System Management Configuration Guide.
Channel frames instead of using the management interface. Note Configuring IOA cluster with the IPFC interface is optional and is supported in Cisco MDS NX-OS Release 5.0(4c) or later. Support for GUI for configuring IOA cluster with the IPFC interface might be added in the future releases.
The first step in the process of configuring IOA cluster to use the IPFC interface is to create a VSAN interface and configure IPv4 addresses. To create an interface VSAN, perform this task: Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
The following example verifies the configuration of sw-231-19 using show interface command: sw-231-19# show interface vsan 1 vsan1 is up, line protocol is up WWPN is 10:00:00:05:30:01:9f:09, FCID is 0xc60000 Internet address is 10.1.1.2/24 Cisco MDS 9000 Family I/O Accelerator Configuration Guide 2-10 OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
Adding a Remote Node to the IOA Cluster The following example adds a remote node to IOA cluster: sw-231-14(config-ioa-cl)# node sw-231-19 ip-address 10.1.1.2 Cisco MDS 9000 Family I/O Accelerator Configuration Guide 2-11 OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
Node sw-231-19 is remote switch Node ID is 2 IP address is 10.1.1.2 Status is online Belongs to Site site1 Node is not master switch Cisco MDS 9000 Family I/O Accelerator Configuration Guide 2-12 OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
This change can be disruptive. Please ensure you have read the "IOA Cluster Recovery Procedure" in the configuration guide. -- Are you sure you want to continue? (y/n) [n] y Cisco MDS 9000 Family I/O Accelerator Configuration Guide 2-14 OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
This change can be disruptive. Please ensure you have read the "IOA Cluster Recovery Procedure" in the configuration guide. -- Are you sure you want to continue? (y/n) [n] y Cisco MDS 9000 Family I/O Accelerator Configuration Guide 2-15 OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
C H A P T E R Deployment Considerations This chapter describes the requirements and guidelines that are necessary to successfully deploy your Cisco I/O Accelerator SAN. Read this chapter before installing or configuring Cisco I/O Accelerator (IOA). This chapter includes the following sections: Supported Topologies, page 3-1 •...
Figure 3-2 illustrates the edge-core-edge topology where you are recommended to place the MSM-18/4 Module or SSN-16 Module at the core switches that interconnect the two sites. Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
MSM-18/4 Module or SSN-16 Module (IOA interfaces) in the core switches that interconnect the two sites. Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
IOA service. The ISLs between the core switches in the specific site has as much throughput as the WAN ISLs between the sites. Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
This topology provides segregation and scalability of the IOA service across multiple sites. In Site-4, a single switch participates in multiple IOA clusters. Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
VSAN before it reaches the target and vice-versa. IVR transit VSANs are used only for FC routing. IOA is not supported or deployed on transit VSANs. For more information, refer to the Cisco MDS 9000 Family NX-OS Inter-VSAN Routing Configuration Guide.
If the management port is connected to a Layer 2 switch, spanning-tree must be disabled on these ports. In a Cisco Catalyst 6000 Series switch, you can implement this by configuring the spanning-tree portfast command on these ports which will treat these ports as access or host ports.
You can provision only one intelligent application on a single service engine. In SSN-16 there are 4 service engines and each service engine can host a single intelligent application. • In Cisco NX-OS Release 4.2(1), only IOA and FCIP can run on the same SSN-16 as in the following example: –...
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Cisco MDS 9000 Family NX-OS Inter-VSAN Routing Configuration Guide. • If there are multiple Cisco IOA clusters in a region, a target can be part of the IOA configuration in only one cluster. To change the target to a different cluster, the configuration in the first cluster must be deleted before creating the configuration in the second cluster.
IOA interface failures. If the number of switches in the SAN exceeds the scalability limit, consider using CFS regions as described in “Using FC-Redirect with CFS Regions” section on page 2-4. Cisco MDS 9000 Family I/O Accelerator Configuration Guide 3-10 OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
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Configuring an IOA Cluster, page 4-5 • IOA Flow Setup Wizard, page 4-11 • Creating Multiple IOA Clusters on a Single Switch, page 4-14 Additional Configurations, page 4-15 • Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
IOA clusters that the switch participates in. To complete the configuration for the reference topology, classify rtp-sw2 into RTP site. Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
IOA Cluster is tape_vault Cluster ID is 0x213a000dec3ee782 Cluster status is online Is between sites SJC and RTP Total Nodes are 2 Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
Step 2 Enters the cluster configuration submode and adds the local sjc-sw2(config)# ioa cluster tape_vault switch where this command is executed into the IOA cluster. sjc-sw2(config-ioa-cl)# Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
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Node is the master switch Node 172.23.144.98 is remote switch Node ID is 2 Status is online Belongs to Site RTP Node is not master switch Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
10:0:0:0:0:0:0:1 This example shows how to display N ports configuration: sjc-sw2# show ioa cluster tape_vault nports ------------------------------------------------------------------------------- P-WWN Site Vsan ------------------------------------------------------------------------------- 10:00:00:00:00:00:00:01 11:00:00:00:00:00:00:01 10:00:00:00:00:00:00:02 11:00:00:00:00:00:00:02 Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
Classify the switches in the candidate switch list into appropriate sites. Step 2 Cisco MDS 9000 Family I/O Accelerator Configuration Guide 4-11 OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
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Host: 10:00:00:00:00:00:03:00 VSAN: 100 Target: 11:00:00:00:00:00:02:00 VSAN:100 Host: 10:00:00:00:00:00:03:00 VSAN: 100 Target: 11:00:00:00:00:00:03:00 VSAN:100 Host: 10:00:00:00:00:00:04:00 VSAN: 100 Target: 11:00:00:00:00:00:04:00 VSAN:100 Do you want to configure these flows? (yes/no) [yes] yes Cisco MDS 9000 Family I/O Accelerator Configuration Guide 4-12 OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
Adds the remote node to the cluster and enters the node configuration mode. sjc-sw2(config-ioa-cl-node)# Adds the IOA interface to the cluster. interface ioa2/3 Cisco MDS 9000 Family I/O Accelerator Configuration Guide 4-14 OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
Shuts down the cluster. This command must be used to sjc-sw2(config-ioa-cl)# shut recover a cluster when it is partitioned. The change can be disruptive. For more information, see “Cluster Recovery Scenarios, page B-5. Cisco MDS 9000 Family I/O Accelerator Configuration Guide 4-15 OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
3-8. Caution The following are advanced tunable parameters, and you must consult the Cisco Services and Support team before tuning these parameters. To set the the following advanced tunable parameters based on your deployment requirements, perform this task:...
Change the node-description (IP address) and node IP-address of a cluster. • Change node-description(DNS name) of a cluster. • Change the node-description from IP address to DNS name and vice versa. Cisco MDS 9000 Family I/O Accelerator Configuration Guide 4-17 OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
Add switch2 Node with New Description and the IP Address, page 4-20 • Add IOA Interfaces on switch2, page 4-20 • Verify the Node Description and IP Address and Flows, page 4-20 • Cisco MDS 9000 Family I/O Accelerator Configuration Guide 4-18 OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
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192.125.231.14 sw-231-19(config-ioa-cl)# sh ioa cluster c1 node sum ------------------------------------------------------------------------------- Switch Site Status Master Node ID ------------------------------------------------------------------------------- 192.125.231.19(L) unknown (cluster is offline) sw-231-19(config-ioa-cl)# Cisco MDS 9000 Family I/O Accelerator Configuration Guide 4-19 OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
Verify the Node Description and IP Address and Flows Use the following show commands to confirm the functioning of the cluster with the new IP address: Cisco MDS 9000 Family I/O Accelerator Configuration Guide 4-20 OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
You can click Stop to cancel the action. However, stopping the action may not roll back the transactions that were executed. Figure 5-1 shows the IOA Manager interface. Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
I/O Accelerator Toolbar Icon Description Applies the changes. Refreshes the window. Adds a cluster or interface. Deletes an existing entry. Displays a real-time chart of the selected switch. Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
To create a new site using IOA Manager, follow these steps: Step 1 Select Sites in the navigation pane. You see the IOA Manager window as shown in Figure 5-3. Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
To remove a site using IOA Manager, follow these steps: In the navigation pane, click the name of the site you want to delete. Step 1 Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
To view a site using IOA Manager, follow these steps: Step 1 In the navigation pane, click Sites. You see the IOA Manager window as shown in Figure 5-8. Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
You see the site details as shown in Figure 5-9. Figure 5-9 Viewing Site Details Using IOA Manager Adding Switches to a Site To add a switch to a site, follow these steps: Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
IOA interfaces. Adding a New Cluster To create a new cluster using IOA Manager, follow these steps: Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
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You see the select switch dialog box as shown in Figure 5-13. Figure 5-13 Select Switch Dialog Box Select a switch from the drop-down list, and then click OK. Step 4 Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
You see the IOA Manager window as shown in Figure 5-15. Figure 5-15 Removing a Cluster Using IOA Manager Click the Remove icon on the toolbar. Step 2 Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
Click the name of the cluster to view the details in the information pane. Step 3 You see the IOA Manager window with the cluster details as shown in Figure 5-18. Cisco MDS 9000 Family I/O Accelerator Configuration Guide 5-10 OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
To add a new interface to a cluster using IOA Manager, follow these steps: Step 1 Expand the cluster node in the navigation pane and click Interfaces. You see the IOA Manager window as shown in Figure 5-19. Cisco MDS 9000 Family I/O Accelerator Configuration Guide 5-11 OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
To remove an interface from a cluster, follow these steps: Step 1 Expand the cluster node in the navigation pane and click Interfaces. You see the IOA Manager window as shown in Figure 5-20. Cisco MDS 9000 Family I/O Accelerator Configuration Guide 5-12 OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
If IVR zoneset is activated, Fabric Manager will automatically consider the IVR zoneset and list the Note candidate IVR flows in the Unassigned flows section. Cisco MDS 9000 Family I/O Accelerator Configuration Guide 5-13 OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
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Check the Enable Compression check box to enable compression. Step 5 Check the Enable Tape Acceleration check box to enable tape acceleration. Step 6 Note Write accleration is enabled by default. Cisco MDS 9000 Family I/O Accelerator Configuration Guide 5-14 OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
Expand the Cluster node in the navigation pane and then click Flows. You see the IOA Manager window displaying the Assigned Flows and Unassigned Flows as shown in Figure 5-24. Cisco MDS 9000 Family I/O Accelerator Configuration Guide 5-15 OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
Select a switch from the Interfaces Statistics table in the information pane. Step 2 You will see the IOA Manager window as shown in Figure 5-25. Cisco MDS 9000 Family I/O Accelerator Configuration Guide 5-16 OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
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Click the chart icon on the toolbar to monitor real-time charts. Step 3 You see the chart as shown in Figure 5-26. Figure 5-26 IOA Manager Real-time Chart Cisco MDS 9000 Family I/O Accelerator Configuration Guide 5-17 OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
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FCIP or Fibre Channel link of the WRITE command and Transfer Ready. It also eliminates the delay caused by multiple Transfer Readys needed for the exchange going over the FCIP or Fibre Channel link. Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
Acting as a proxy for the remote tape drives, the local Cisco MDS switch proxies a transfer ready to signal the host to start sending data. After receiving all the data, the local Cisco MDS switch proxies the successful completion of the SCSI WRITE operation.
SCSI read operations from the host, sends out SCSI read operations on its own to the tape drive. The prefetched read data is cached at the local Cisco MDS switch. The local Cisco MDS switch on receiving SCSI read operations from the host, sends out the cached data. This method results in more data being sent over the FCIP or FC tunnel in the same time period compared to the time taken to send data without read acceleration for tapes.
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In tape acceleration for writes, after a certain amount of data has been buffered at the remote Cisco MDS switch, the write operations from the host are flow controlled by the local Cisco MDS switch by not proxying the Transfer Ready.
Node ID Every switch in a cluster has a node ID. Cisco IOA assigns a node ID to every new switch as it is added to the cluster. The switch where the cluster is created is assigned the node ID of 1. This is the master switch.
When the switches lose connectivity between them, the master switch S1 continues to be operational since it has the lower node ID and can form an (N/2) switch cluster. Switch S2 becomes nonoperational. Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
S2 will be the master. When S1 comes up again, it will rejoin the cluster. Note that S2 will continue to be the master. If two switches fail, the cluster will become nonoperational. These examples describe reboots on all switches in the cluster: Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
After the ISSU is completed and the switches boot up, the upgraded node rejoins the cluster as a • slave node. This feature is tied to ISSU logic and no additional commands need to be executed. Note Cisco MDS 9000 Family I/O Accelerator Configuration Guide OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
Refer to this section for information on recovery procedures that are used when one or more switches in a Cisco IOA cluster is offline or when you want to change the master switch assignment from one switch to another switch.
Deleting a Cisco IOA Cluster with One or More Offline Switches while the Master Switch is Online To delete a Cisco IOA cluster that includes one or more offline switches and online master switch, use these procedures. Do not remove a cluster master switch from a cluster and then try to revive the cluster on an offline Caution switch.
Delete the cluster on every offline switch that was shut down in the first procedure. Deleting a Cisco IOA Cluster when All Switches Are Offline To delete a Cisco IOA cluster when the master switch and all other switches are offline, use these procedures.
(for example, due to a quorum loss). The recovery procedure includes deleting one or more offline switches and then reviving the cluster on the remaining switches. A Cisco IOA cluster must only be revived on the switch with the latest IOA configuration version as Caution displayed by the show IOA cluster detail command.