When to stop I/O
If your storage array contains two controllers and you have a multipath driver installed, the storage array can
remain processing I/O while the upgrade occurs. During the upgrade, controller A fails over all of its LUNs to
controller B, upgrades, takes back its LUNs and all of controller B’s LUNs, and then upgrades controller B.
After the upgrade completes, you might need to manually redistribute volumes between the controllers to
ensure volumes return to the correct owning controller.
Pre-upgrade health check
A pre-upgrade health check runs as part of the upgrade process. The pre-upgrade health check assesses all
storage array components to make sure the upgrade can proceed. The following conditions might prevent
the upgrade:
• Failed assigned drives
• Hot spares in use
• Incomplete volume groups
• Exclusive operations running
• Missing volumes
• Controller in Non-optimal status
• Excess number of event log events
• Configuration database validation failure
• Drives with old versions of DACstore
You also can run the pre-upgrade health check separately without doing an upgrade.
Considerations for upgrading drive firmware
Take into account some key considerations before upgrading your drive firmware.
Drive compatibility
Each drive firmware file contains information about the drive type on which the firmware runs. You can
download the specified firmware file only to a compatible drive. System Manager automatically checks
compatibility during the upgrade process.
Drive upgrade methods
There are two types of drive firmware upgrade methods: online and offline.
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ThinkSystem DE Series Hardware Installation and Maintenance Guide for 2U Enclosures
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