Customize the Knowledge Base › Implement Changes › Add a New Rule

Add a New Rule

Assume that a user would like you to add a rule that fires when any disk is low on space. The following data cells: DISK_MAX_BLOCKS, ANY_DISK_FULL (a binary data cell type derived from DISK_MAX_BLOCKS), and DISK_MOST_FULL_X (an index specifier pointing to the most affected disk) make this type of rule possible. An example of adding a new rule to check for disk space shortages follows:

To creating a new rule

• Use the following code

  Rule UI101
   Any_disk_full .eq. True;
   Occurrences = td_IO;
  
  Evidence =
   Volume_name(Disk_most_full_x)
   Disk_free_pages(Disk_most_full_x)
   Time;
  
  Conclusion
  "The following disks are almost full. You should purge or
  delete any unnecessary files. You might also consider 
  moving some files to a disk with more free space."
  
  Brief_conclusion
  "Disk space shortage. Clean up disk or off-load some files."
  
  EndRule
  

You could insert the type of rule shown in the previous example in many possible places within the I/O decision tree used by the Performance Manager software, which would add more conditions to those presented here. Also, you might have a large reference database that completely fills up N-1 volumes of its volume set, so you would want to exclude those from consideration. Finally, you might want to show additional data cells in the Evidence.