Remove Disk Units From ASP Using SST

Starting in V7R1, disk units can be removed from an ASP using SST by doing the following:

1. Issue the STRSST command.

2. Select Option 3. Work with Disk Units.

3. Select Option 2. Work with Disk Configuration:



4. Use new Option 12. Work with Removing Units From Configuration:



5. Use Option 3 to remove units (Remove Units from Configuration). Important Note: You can only remove units from one ASP at a time:



6. When you press Enter to select the units for removal, you receive the following confirmation screen:



7. Pressing F9 on the confirmation screen can be used to check what the resulting capacity will be after the units are removed:



8. Selecting Option 2 from the Work with Removing units From Configuration screen will show the status.

9. Selecting Option 4 will pause the remove operation. This stops the data removal from all of the drives being removed; however, they are still marked for removal.

10. Selecting Option 5 will resume a paused remove operation.

11. Selecting Option 6 will cancel a paused remove operation. Warning: This option does not rebalance the data!

12. Selecting Option 7 will cancel a paused remove operation and balance the ASP data.

Notes:
1. An IPL or Vary Off during a concurrent remove operation will force the remove into paused status. It will not automatically resume.
2. When moving data off units, Media preferences for SSD units are respected.
3. DST only has options to remove units and to display status - DST does not allow Pause, Resume or Cancel.
4. Even though concurrent removal of units from an ASP is now available, only IBM i 7.5 TR2 and above is supported, and concurrent removal of physical DASD resources is supported via hardware concurrent maintenance. After taking option 12 to remove a LUN from the ASP, concurrent removal of connections for a virtual disk or an external storage LUN is not supported. Once LUNs or virtual disks have been removed from an ASP (non-configured), the system should be power down before removing (unmapping, rezoning, etc.) the connections to backing storage of logical or virtual disks.