HP Brocade BladeSystem 4/12 HP StorageWorks Fabric OS 6.x administrator guide - Page 166
Upgrading and downgrading firmware, Effects of firmware changes on accounts and passwords
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The command supports both non-interactive and interactive modes. If the firmwareDownload command is issued without any operands, or if there is any syntax error in the parameters, the command enters an interactive mode, in which you are prompted for input. TIP: For each switch in your fabric, complete all firmware download changes on the current switch before issuing the firmwareDownload command on the next switch. This process ensures nondisruption of traffic between switches in your fabric. To verify the firmwareDownload process is complete, enter the firmwareDownloadStatus command on the switch, verify the process is complete, then move on to the next switch. Upgrading and downgrading firmware Upgrading means installing a newer version of firmware. Downgrading means installing an older version of firmware. In most cases, you will be upgrading firmware; that is, installing a newer firmware version than the one you are currently running. However, some circumstances may require installing an older version; that is, downgrading the firmware. The procedures in this section assume that you are upgrading firmware, but they work for downgrading as well, provided the old and new firmware versions are compatible. Always reference the latest HP StorageWorks Fabric OS release notes for updates that may exist regarding downgrades. Using the CLI (or Web Tools), you can upgrade the firmware on one switch at a time. You can also use the optional Fabric Manager application to upgrade firmware simultaneously on multiple switches. Effects of firmware changes on accounts and passwords Table 49 describes what happens to accounts and passwords when you replace the switch firmware with a different version. Table 49 Effects of firmware changes on accounts and passwords Change Upgrading Downgrading First time Default accounts and their passwords are preserved. User-defined accounts are no longer valid. Default accounts and their passwords are preserved. If a default account was disabled, it is reenabled after the downgrade. Subsequent times (After upgrade, then downgrade, then upgrade) User-defined and default accounts and their passwords are preserved. User-defined and default accounts and their passwords are preserved, including accounts added after the first upgrade. For details on administrative domains and the firmware download, see "Managing administrative domains" on page 21 for more information. For more details on older releases of Fabric OS, see "Understanding legacy password behavior" on page 499. For details about testing and restoring firmware, see "Testing and restoring firmware on directors" on page 180. Considerations for FICON CUP environments To prevent channel errors during nondisruptive firmware installation, the switch CUP port must be taken offline from all host systems. 166 Installing and maintaining firmware