50 | Getting Startedw w w . d e l l . c o m | s u p p o r t . d e l l . c o m Installing System SoftwareAfter downloading a new software image (see Downloading a Software Image on page 45) and backing upthe configuration (see Saving the Running Configuration on page 49), you are ready to install the newsoftware. Execute the reload command, as shown in Using the reload command to upgrade to SFTOS 2.5.1on page 53.Managing SFTOS Software with SFTOS Version 2.5.1SFTOS v. 2.5.1 adds the Dual Image Management feature. It enables you to keep two SFTOS images oneach stack member. Benefits include being able to revert easily to the previous SFTOS image if youdiscover that a newly installed image is problematic. It also enables you to defer installing the newlydownloaded image through one or more reboots.The copy command, when used to download a new SFTOS software image, propagates the software to allunits in the stack. In addition, the copy command provides an option to manually copy an image to aselected stack member, typically a new member that does not yet have the software version that is set to beinstalled in the next reboot. For details, see Copying SFTOS Software to a Member Switch on page 95 inthe Stacking chapter.The reload [unit] command now provides selective rebooting of stack members. Combined with the abilityin SFTOS 2.5.1 to select which software image is invoked in a reboot, you have various options inchoosing which software is launched in specific stack members. For example, you might choose to reboota particular member without installing the new code copied to it.
