Interstage Shunsaku Data Manager Operator's Guide - Microsoft(R) Windows(R) 2000/ Microsoft(R) Windows Server(TM) 2003 - - UNIX -

2.2.7 Designing Backups

Design backups to be performed during Shunsaku operation.

Backups must be designed taking into account the recovery operation performed in the event of a disk malfunction. The key design points are explained below:

• Operation log file use

  Determine whether to use an operation log file by taking into account how frequent the data is updated.

  Refer to 5.1.1 Relationship between Operation Log Files and Backup Data for more details.

• Backup cycle

  Determine how often backups should be performed.

  Refer to 5.1.2 Backup Cycle for more details.

• Location of files on disks

  Determine the location of the disk taking into account an operation of the backup.

  The following files should be placed in the following locations to distribute risk in the event of a disk malfunction.

  File name	Location
  Director data file	Disk 1
  Environment files
  Operation log file	Disk 2
  Backup data (*1)

  *1) Backup data of director data files and environment files

When operation log files are used in a configuration containing multiple director servers, it is necessary to synchronize the time on all server machines. Failure to do so can prevent correct recovery.