Estimating catalog space requirements on Windows
|Article:HOWTO34433|||||Created: 2010-10-29|||||Updated: 2011-03-11|||||Article URL http://www.symantec.com/docs/HOWTO34433|
The disk space that NetBackup needs varies according to the following factors:
To estimate the disk space that is required for a catalog backup
Assume that you schedule full backups to occur every seven days. The full backups have a retention period of four weeks. Differential incremental backups are scheduled to run daily and have a retention period of one week.
A daily differential incremental schedule backs up 1200 files and the retention period for the backup is seven days. Given this information, the maximum number of files that can exist at one time are the following:
For the policies that collect true image restore information, an incremental backup collects catalog information on all files (as if it were a full backup). This changes the calculation in the example: the incremental changes from 1200 × 7 = 8400 to 3000 × 7 = 21,000. After 12,000 is added for the full backups, the total for the two schedules is 33,000 rather than 20,400.
Add between 10 megabytes to 15 megabytes to the total sum that was calculated in step 4. The additional megabytes account for the average space that is required for the error logs. Increase the value if you anticipate problems.
Article URL http://www.symantec.com/docs/HOWTO34433