9.2.3 Designing HiRDB file system areas for work table files

This section discusses the design considerations for HiRDB file system areas in which work table files are to be created.

Organization of this subsection
(1) Design for improved reliability
(2) Checking the peak capacity

(1) Design for improved reliability

  1. Work table files can be allocated to regular files. However, if the system switchover facility is used, disk space can be saved by allocating work table files to character special files because the files can then be shared.
  2. The amount of space required for a HiRDB file system area for work table files must be greater than the total size of the work table files to be created in the area. For details about the sizes of work table files, see 19. Determining Work Table File Size.
  3. With Linux, the file system area for work table files cannot be created in character special files.

(2) Checking the peak capacity

The peak capacity of a HiRDB file system area for work table files can be obtained by entering the following command:

pdfstatfs -d name-of-HiRDB-file-system-area-for-work-tables
-d
Specifies that the maximum utilization value for the allocated HiRDB file system area is to be displayed. The peak capacity display that is output is this value. The maximum utilization value is cleared by entering the following pdfstatfs command:
pdfstatfs -c name-of-HiRDB-file-system-area-for-work-table
-c
Specifies that the maximum utilization value for the allocated HiRDB file system area is to be cleared to 0.