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Appendix B. Using the DS6000 with iSeries 359
You can then use the OS/400 command STRASPBAL TYPE(*ENDALC) to mark the units to
be removed from the configuration as shown in Figure B-36. This can reduce the down time
associated with removing a disk unit. This will keep new allocations away from the marked
units.
Figure B-36 Ending allocation for existing disk units
When you subsequently run the OS/400 command STRASPBAL TYPE(*MOVDTA) all data
will be moved from the marked units to other units in the same ASP, as shown in Figure B-37.
Clearly you must have sufficient new capacity to allow the data to be migrated.
Figure B-37 Moving data from units marked *ENDALC
You can specify a time limit that the function is to run for each ASP being balanced or the
balance can be set to run to completion. If the balance function needs to be ended prior to
this, use the End ASP Balance (ENDASPBAL) command. A message will be sent to the
system history (QHST) log when the balancing function is started for each ASP. A message
will also be sent to the QHST log when the balancing function completes or is ended.
If the balance function is run for a few hours and then stopped, it will continue from where it
left off when the balance function restarts. This allows the balancing to be run during off hours
over several days.
In order to finally remove the old units from the configuration, you will need to use Dedicated
Service Tools (DST) and re-IPL the system (or partition).
Using this method allows you to remove the existing storage units over a period of time.
However, it does require that both the old and new units are attached to the system at the
same time so it may require additional IOPs and IOAs if migrating from an ESS to a DS6000.
It may be possible in your environment to re-allocate logical volumes to other IOAs, but
careful planning and implementation will be required.
Start ASP Balance (STRASPBAL)
Type choices, press Enter.
Balance type . . . . . . . . . . > *ENDALC *CAPACITY, *USAGE, *HSM...
Storage unit . . . . . . . . . . 1-4094
+ for more values
Bottom
F3=Exit F4=Prompt F5=Refresh F12=Cancel F13=How to use this display
F24=More keys
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