IBM Support

Technote (troubleshooting)


Problem(Abstract)

This document provides information about moving data off disks in preparation of removing the disks from the ASP.

Resolving the problem

If you are planning to remove disk drives from your ASP configuration and want to reduce the down time associated with removing drives using DST, you can begin by stopping new data from being written to the selected disk units and move data off those disks. This can be done using the STRASPBAL command while the system is up and running.

Notes:
1. The *ENDALC and *MOVDTA options are available in R520 and newer releases.
2. Starting at R710, drives can now be removed from an ASP using SST instead of using the procedure in this document; refer to document N1011602, Remove Disk Units From ASP Using SST.

You should do the following:

Step 1: On the operating system command line, type the following:

STRASPBAL *ENDALC

Press the F4 key to prompt the command. The screen will look similar to the following:

                          Start ASP Balance (STRASPBAL)                        
                                                                               
 Type choices, press Enter.                                                    
                                                                               
 Balance type . . . . . . . . . . > *ENDALC       *CAPACITY, *USAGE, *HSM...    
 Storage unit . . . . . . . . . .   ___________   Number                        
                + for more values   ___________                      
                                                                               
                                                                               
                                                                               
                                                                               


                                                                               
                                                                               
                                                                               
                                                                               
                                                                         Bottom
 F3=Exit   F4=Prompt   F5=Refresh   F12=Cancel   F13=How to use this display    
 F24=More keys

Type the disk unit numbers in the Storage unit field and press the Enter key. This stops new data from being written to the selected disk units.

Step 2: On the operating system command line, type the following:

STRASPBAL *MOVDTA

and press the F4 key to prompt the command. The screen will look similar to the following:

                         Start ASP Balance (STRASPBAL)                        
                                                                             
Type choices, press Enter.                                                    
                                                                             
Balance type . . . . . . . . . . > *MOVDTA       *CAPACITY, *USAGE, *HSM...  
Time limit . . . . . . . . . . .   ___________   1-9999 minutes, *NOMAX      
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                        Bottom
F3=Exit   F4=Prompt   F5=Refresh   F12=Cancel   F13=How to use this display  
F24=More keys

Type a Time Limit for this procedure to run. It is suggested that you use *NOMAX so the maximum amount of data is moved off the disks.

There are some types of data that cannot be moved with this command. It is common for the disks not to drop to 0% used.

Note: For R520, journal data is not moved by the STRASPBAL command. R530 and higher will move journal data.

Step 3: After STRASPBAL has completed, the drives are ready to be removed from the ASP configuration during a manual IPL by using DST.

Note: As long as any disk units are marked for *ENDALC, the drives in the ASP typically appear unbalanced.

For additional information, refer to document 8N1019618, Operating System Disk Balancing Support.


Cross reference information
Segment Product Component Platform Version Edition
Operating System IBM i 6.1

Historical Number

390398321

Document information

More support for: IBM i
Internals

Software version: 5.2.0, 5.3.0, 5.3.5, 5.4.0, 5.4.5, 6.1, 6.1.0, 6.1.1

Operating system(s): IBM i

Reference #: N1019072

Modified date: 2012-11-15