The storage space that is required for Tivoli® Storage FlashCopy® Manager can be divided into several categories.
The storage space categories are identified in the following list:
The space that is required for the product installation of Tivoli Storage FlashCopy Manager depends on which components are installed. Space requirements also change because of maintenance updates and the addition of operating system, application, and other software currency support. For the most current requirements, review the Hardware and Software Requirements technote that is associated with the level of your Tivoli Storage FlashCopy Manager. This technote is available in the Tivoli Storage FlashCopy Manager - All Requirement Documents website at http://www.ibm.com/support/docview.wss?uid=swg21427692. Follow the link to the requirements technote for your specific release or update level.
Tivoli Storage FlashCopy Manager uses disk space to store product data that is used to track and manage snapshots. The amount of space that is required is directly proportional to the number of snapshots that you maintain on the system. Ensure that there is at least 1 MB of available free disk space to hold the metadata for each snapshot that you plan to keep on the system.
The actual snapshot copies of your application data require the most space. The amount of space that is required depends on the following factors:
On SAN Volume Controller, DS8000®, and Storwize® V7000 storage devices, full snapshot copies require the same amount of space as the corresponding source volumes. Full snapshots are the standard type of FlashCopy. However, with the Windows System VSS provider, space-efficient copies on SAN Volume Controller and the XIV® system initially require only sparse space for metadata. The space demand of the snapshot copies increases with every block that is changed on the corresponding source volume. The more source volume blocks are changed, the more space is required for the target volumes that represent a snapshot copy of those applications. For more details, read the documentation that is available for the VSS provider that is being used.