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

5.3.3 Recovery

If a malfunction occurs in the disk containing the director data files while the system is in operation, Shunsaku will output a "shn30306u" message to the event log or system log (syslog) of the director server.

The following diagram shows an example of a recovery operation performed when the disk containing the director data files malfunctions.

[Figure : Performing Recovery when the Disk Containing Director Data Files Malfunctions]

The following procedure is used to restore the director data files to the state that existed immediately prior to the malfunction.

Before recovering director data files, stop all applications to prevent data searches and updates from occurring.

[Figure : Procedure for Restoring Director Data Files]

1. Check the event log or system log (syslog) to identify the location of the fault.

   If a disk fault occurs while the director data file directory is being accessed, Shunsaku will output the following message to the event log or system log (syslog):

   shn30306u: An I/O error has occurred with a director data file.
   file=file name System call=function name errno=error number (director) [director identifier name]
   Shunsaku System Name=Shunsaku system name

   
   

   Use the message to confirm the name of the device where the disk fault occurred or the full pathname of the file.

2. Execute the shundrecover command with the -b option to declare the start of the recovery process.

   

   If the operating system needs to be restarted during disk replacement, restart the operating system, then perform Step 3 before Step 2 (this step).
   Ensure that all applications are stopped, start Shunsaku, and then perform Step 2 (this step) after Step 3 is performed.

   shundrecover -s director identifier -b

3. Replace the faulty disk and recreate the directory that will contain the director data files.
4. Use an operating system command or a disk device copy function to restore the backup data of the director data files.

   

   copy command, etc.

   

   cp command, etc.

5. Execute the shundrecover command with the -e option to declare the end of the recovery process.

   The recovery end declaration will use the operation log file to restore the director data file to the state that existed immediately before the problem occurred.

   shundrecover -s director identifier -e

• The shundrecover command recovers only the backup data of the director data file that was backed up using the shundbackup command.
• If director data has not been backed up, it cannot be recovered normally. If this is the case, use the following procedure to eliminate the cause of the I/O error with the director data file and then register the lookup data again:
  • Identify the location of the fault as described in step 1.
  • Stop Shunsaku.
  • Replace the disk and recreate the directory in which director data is located.
  • Restart Shunsaku.
  • Register the lookup data.

  Refer to 3.2 Starting and Stopping Shunsaku for more information on how to start and stop Shunsaku.
  Refer to 3.3 Registering Lookup Data for more information on how to register lookup data.