Cisco 4.x SRND states the following regarding upgrade the tftp server. Anybody knbows what Cisco TFTP - BuildDuration time is? A tool? thanks
When upgrading a Cisco Unified CallManager cluster, Cisco highly recommends that you upgrade the TFTP servers after the publisher and before any other server, also allowing additional time following the upgrade for the TFTP server to rebuild all the configuration files. Either use the typical Cisco TFTP - BuildDuration time or use the real-time monitoring tool to monitor the Cisco TFTP - DeviceBuildCount until it stops incrementing.