Upgrading a Portal and Data Collectors > Portal and Database Upgrades (Windows Portal)
  
Version 10.1.01
Portal and Database Upgrades (Windows Portal)
Due to functionality incorporated into versions 9.1 and higher, additional disk space is required for the Portal upgrade.
Current Portal Version
Upgrade Portal Version
 
9.1 or earlier
10.xx
An additional 2 GB is required in C:\oradata
9.0.00 or earlier
10.xx
An additional 6 GB is required in C:\oradata