Sometimes, especially when you do a problem management, you have a need to downgrade firmwares on some system components. I have such need for IBM V7000 storage array. Downgrade process is not documented in IBM official documentation so here is the downgrade process step by step:
- Double check you have IP addresses on management interfaces of both canisters (controllers)
- Login to management interface of one particular canister over https. https://[ip_mgmt_canister]. You have to use superuser credentials. Default IBM Storwize superuser password is passw0rd
- Switch node to serrvice state. You should wait 15-20 minutes
- Login to second node management interface.
- Switch second node to service state. You should wait another 15-20 minutes
- Double check both nodes are in service state
- Login to one node and choose action "Reinstall software". Browse and upload firmware image via web browser. Software reinstallation takes a while. You have to wait approximattely one or two hours. In the mean time you can ping canyster management IP addresses to check when nodes comming back.
- Repeat software reinstallation for second node.
- Please be aware that storage configuration is lost after software reinstallation. Therefore you have to use default password for superuser. Recall it is passw0rd
- When both nodes are up and running login to one canister node management interface and exit both nodes from service state. It can takes another 15-20 minutes.
- When nodes are active you have to regenerate Cluster ID. You have to go to "Configure Enclosure" and enable checkbox "Reset System ID".
- After all these actions you have Storwize ready to form a new Cluster. So create cluster and assign cluster virtual IP address you will use for standard storage management.
