: Shut down the hosts (servers) first, then the storage subsystem, and finally the expansion units.
Can I update firmware without host interruption? A: Yes, only if both controllers are online, multipath I/O is active, and no exclusive operations (like FlashCopy rollback) are in progress. See “Firmware update best practices” in the Software Guide . ibm ds3512 manual
Based on search data, users look for the IBM DS3512 manual to resolve specific issues. Here are solutions drawn directly from official procedures. : Shut down the hosts (servers) first, then
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For advanced features like snapshots and volume copying, consult the IBM Copy Services Guide . Quick Setup Defaults then the storage subsystem