Never Upgrade Database Schema When Disk Drive is Defragmented

My company's Data Warehouse development has finally completed for this release. The architecture team is now at the client site and deploying the Data Warehouse solution. We had estimated we will only take 4 hrs to upgrade the Live Database. We will be performing the first ETL offline. Unfortunately we failed the upgrade last time, not because of incorrect script or any technical error. it is because of the following: Instead of taking 4 hrs to do the database upgrade, we have to bail out after 6 hrs of waiting for the upgrade script to complete. Next time, check the hard drive fragmentation first before doing any database upgrade!