IBM Support

Remove Disk Units From ASP Using SST

Troubleshooting


Problem

This document explains how to remove disk units concurrently from an ASP using SST.

Resolving The Problem

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:

Work with disk configuration screen shot showing the new option 12 - work with removing units from configuration

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

Screen shot showing the new work with removing units from configuration menu

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

Remove units from configuration screen shot showing list of units and option 4 to remove units from configuration

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

Confirm remove disk units screen shot

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

Resulting capacity screen shot showing current size and percent used for the ASP and the proposed values after disk removal

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 remove operation. Warning: This option does not rebalance the data!

12. Selecting Option 7 will cancel a 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 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.

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Historical Number

595484398

Document Information

Modified date:
06 November 2020

UID

nas8N1011602