Hardware-Avoid power interruptions during an installation procedure.
Bootflash can be busy due to open or active SFTP session, file operation, and so on.
Bootflash-During ISSU, bootflash must be free.
Also, run the show system internal flash command to check that the threshold limit for the filesystems /bootflash/mnt/pss /var/tmp and /var/sysmgr are met. The internal bootflash requires approximately 200 MB of free space.
Space-Verify that sufficient space is available in the location where you are copying the images.
You cannot configure a switch during an upgrade. Ensure that everyone who has access to the switch or the network is not configuring the switch or the network during this time.
Scheduling-You should upgrade when your network is stable and steady.
You should perform module installations or removals only before or after an upgrade.
Topology-You should make topology changes such as Spanning Tree Protocol (STP) that affect zoning or Fabric Shortest Path First (FSPF) before you perform an upgrade.
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