PowerFlex 4.x Converting the embedded OS from CentOS to SLES

The Replace Node OS wizard performs the following while converting an embedded OS from CentOS to SLES:

1. Determining the order of storage virtual machines and PowerFlex storage-only node upgrade, selecting first candidate node, and configuring MDM roles.
2. Placing the PowerFlex node to be converted into maintenance mode.
3. Backing up the existing configuration files and settings before OS conversion.
4. Installing SLES OS with all the necessary dependencies and configuring the SLES repository mapping.
5. Reapplying configuration settings and installing PowerFlex software packages.
6. Exiting from the maintenance mode.
7. Reconfiguring the MDM roles, selecting the next PowerFlex node for conversion, and repeating step 2 through 7 until all the storage VMs and PowerFlex storage-only nodes are converted.

Use this procedure to verify that the resource group to be converted is fully compliant.

1. Log in to PowerFlex Manager.
2. On the menu bar, click Lifecycle > Resource Groups.
3. On the Resource Groups page, select View Compliance Report.
4. Select View Compliance Report.
5. If there are any resources that are showing a non-compliant status (yellow triangle with an exclamation), verify and address any compliance related issues.
6. Verify that both the Firmware and Software tabs indicate that the resources are compliant.
7. Click Update Resources.

Use the procedure in this section to convert the PowerFlex storage-only nodes or storage virtual machines from embedded operating system based on CentOS to embedded operating system based on SLES.

1. On the menu bar, click Lifecycle > Resource Groups.
2. On the Resource Groups page, select a resource group and click View Details in the right pane.
3. Click Replace Node OS under More Actions.
4. For a resource group of three PowerFlex nodes, select Instant Maintenance Mode. For a resource group of four or more PowerFlex nodes, select Protected Maintenance Mode.
   When you use protected maintenance mode, PowerFlex makes a temporary copy of the data so that the cluster is fully protected from data loss. Protected maintenance mode applies only to hyperconverged and storage-only resource groups.
5. Select one or more nodes in the Available Nodes list and click the arrow icon (>>) to move these items to the Selected Nodes list.

   The Available Nodes list shows all the nodes in the resource group, along with the name, IP address, MDM role, fault set (if applicable), and operating system for each node. PowerFlex nodes with embedded operating system based on CentOS are selectable. The check boxes for PowerFlex nodes with embedded operating system based on SLES are disabled.

   PowerFlex Manager shows all the SDSs in a storage-only resource group and all the SVMs for a hyperconverged resource group. For a PowerFlex hyperconverged resource group, the operating system field shows the operating system for the SVM.

   You can optionally add a filter to control which nodes appear in the list.

6. Type REPLACE OPERATING SYSTEM to confirm your changes.
7. Click Submit.
   The progress of the operation is displayed in Recent Activity. In the table on the Resource Group Details page, you can see whether the update succeeded or failed for each node. A node appears in service mode if the operation fails. If you see a failure, you can click Replace Node OS to restart the replacement.
   NOTE:If you renamed an MDM from the default name, the MDM name reverts to the default name after the operating system is replaced. You can rename the MDM either through the CLI or REST API. See the Dell PowerFlex Manager 4.6.x CLI Reference Guide or the Dell PowerFlex API Documentation.

Use this procedure to verify that the resource group is in compliant after converting from an embedded operating system based on CentOS to an embedded operating system based on SLES.

1. On the menu bar, click Lifecycle > Resource Groups.
2. Select the resource group to be converted.
3. From the Resource Group Details tab, click View Compliance Report.
4. Click Software Components.
5. For each node, expand the node and verify that the hostname is displayed. If the node is an SVM, you should see both the VMware ESXi hostname and the SVM hostname.
6. Expand the storage node.
7. Verify that the Current Version and Expected Version match. Verify that the EMC-ScaleIO-sds expected version name contains sles.
   For example, 4.5-2000.129.sles15.4.

Use this procedure to update the resource group details while converting the embedded operating system based on CentOS to embedded operating system based on SLES.

1. On the menu bar, click Lifecycle > Resource Groups.
2. On the Resource Groups page, select a resource group to be converted.
3. Click More Actions > Update Resource Group Details.
4. From the Update Resource Group Details window, do the following:
   1. Under OS Credentials, ensure that the appropriate credentials are selected for the nodes and SVMs (if applicable) and click Next
   2. Under Inventory Summary, ensure all the volumes and nodes that are part of the resource group are listed and click Next.
   3. Under Summary, click Finish. It may take a moment for the window to close and for the job to start.
   4. After the resource group details are updated, verify that the resource group is in compliance. See Verify the resource group is compliant after conversion.