Deleting a fixed block data storage configuration

Complete this task to delete a fixed block data storage configuration.

1. Remove host access to the volumes that will be removed. This generally requires the issuance of the lshostconnect command and the rmhostconnect command.
   1. Issue the lshostconnect command to display a list of SCSI host port IDs that are associated with the storage to be removed. Enter the lshostconnect command at the dscli command prompt as follows:

      dscli>lshostconnect -dev IBM.1750–68FA120 -l -portgrp 1 

      Notes:

      1. The -portgrp port_grp_number parameter is used to only list those port IDs that are associated with a port group number that you assigned when you originally created the host connection.
      2. The -l parameter is used to generate the detailed status report for each host connection.
   2. Issue the rmhostconnect command to delete the SCSI host port IDs that are associated with the storage volumes to be removed. Enter the rmhostconnect at the dscli command prompt as follows:

      dscli>rmhostconnect -dev IBM.1750–68FA120 1

      Notes:

      1. The host_connect_ID parameter (1 in the command example) is required and is a unique identifier (0 - 65 534) within the scope of a storage unit.
      2. A message is displayed with a request that you confirm the deletion of the host connection.
2. Find the volume groups and volume group storage maps by issuing the lsvolgrp and showvolgrp commands.
   1. Issue the lsvolgrp command to display a list of defined volume group IDs and their characteristics. Enter the lsvolgrp command at the dscli command prompt as follows:

      dscli>lsvolgrp -dev IBM.1750–68FA120 -l

   2. Issue the showvolgrp command to display the detailed properties of the volume group that you want to delete. Enter the showvolgrp command at the dscli command prompt as follows:

      dscli>showvolgrp -dev IBM.1750–68FA120 -lunmap V1001  

      Repeat the showvolgrp command for each volume group you want to delete.

      Note: The Volume_Group_ID (V1001) parameter is required. The shortened form is allowed when you designate the -dev parameter.
   3. Copy the list of volumes within the volume group for later use when you analyze which volumes that you want to remove.
3. Remove the volume groups, as a means to remove volume access by host systems, by issuing the rmvolgrp command. Enter the rmvolgrp command at the dscli command prompt as follows:

   dscli>rmvolgrp -dev IBM.1750–68FA120 V123-V125

   Notes:

   1. All volume groups that are specified for deletion must belong to the same storage unit.
   2. The Volume_Group_ID parameter (V123-V125 in the example) is required. The shortened version of the ID is allowed if you designate the -dev parameter.
   3. The example command shows a range of volume group IDs. If you have another volume group or another volume group range, you must add a blank between the designations (for example, V123-V125 V130-V133 V135)
   4. A message is displayed for each deleted volume group ID or range of volume group IDs. The message requests that you confirm the deletion.
4. Remove the fixed block volumes by issuing the rmfbvol command. This action enables the removal of the associated ranks, arrays and extent pools. Enter the rmfbvol command at the dscli command prompt as follows:

   dscli>rmfbvol -dev IBM.1750-68FA120 0100 0101

   Notes:

   1. The associated logical subsystem (LSS) is automatically removed when the last volume that is contained by the LSS is removed.
   2. The Volume_ID parameter (represented by 0100 0101 in the example) is required when you issue the rmfbvol command. The shortened version of the ID is allowed if you designate the -dev parameter.
   3. A message is displayed for each volume that is deleted. The message requests that you confirm the deletion.
5. Remove the ranks by issuing the lsrank and rmrank commands.
   1. Issue the lsrank command to display a list of rank IDs to be removed. Use the command parameters to develop a selective list of rank IDs. Enter the lsrank command at the dscli prompt as follows:

      dscli>lsrank -dev IBM.1750-68FA120 -l

      Note: Rank IDs that indicate extents used = 0 are eligible to be removed. If extents used are greater than 0 then rank segments are currently assigned to existing volume IDs.
   2. Issue the rmrank command to remove the ranks that are assigned to the arrays. Enter the rmrank command at the dscli prompt as follows:

      dscli>rmrank -dev IBM.1750-68FA120 R23

      Notes:

      1. The rank_ID parameter (R23 in the example) is required. The shortened version of the ID is allowed if you designate the -dev parameter.
      2. You must remove the ranks before you can remove the arrays and extent pools.
      3. The processing time that is associated with the rmrank command can be lengthy and might inhibit your use of the array on which this command is being processed.
      4. When the rmrank command is issued, the following processing occurs:
         • The rank is unassigned from the array.
         • The rank is removed. When this is successful, a message is displayed. This part of the process does not take long; however, the processing that is associated with this command is not complete even though you have received a message that the rank was removed.
         • The array is formatted. This processing can take some time. During this processing the array cannot be removed or assigned to another rank. Also, until this process is fully completed, the rank is listed as assigned to the array from which it is has been removed.
         • You can check the progress of the rmrank command by logging onto another session of DS CLI. Issue the lsarray command against the storage unit where the rank or ranks are being deleted. When you no longer see the rank that is assigned to the array from which you removed it, the remove rank process is complete.
6. Remove the arrays by issuing the lsarray and rmarray commands.
   1. Issue the lsarray command to obtain a list of array IDs to be removed. Enter the lsarray command at the dscli prompt as follows:

      dscli>lsarray -dev IBM.1750-68FA120 -state unassigned

      Notes:

      1. The -state unassigned parameter allows you to narrow your list to just the array IDs that are not assigned to a rank ID.
      2. If you issue the lsarray command without using the -state parameter, it is possible you will see a list of arrays that have a state of unavailable. This is generally a good indication that the ranks have not been removed and that the drives are still formatting. You must wait until the ranks have been removed and the drives have been formatted before you can proceed.
      3. Proceed to the next step (remove arrays) only after all the associated arrays are displayed with a state of unassigned.
   2. Issue the rmarray command to delete the unassigned arrays so that the array sites can be redefined as new arrays. Enter the rmarray command at the dscli command prompt as follows:

      dscli>rmarray -dev IBM.1750-68FA120 A44-A48 A51

      Notes:

      1. The example command displays the use of a range of array IDs plus one additional array ID.(A44-A48 A51). A range of arrays requires the use of a hyphen and a space between the next array or another range of arrays.
      2. A message is displayed for each array being deleted that requests your confirmation before processing.
7. Remove the extent pools by issuing the lsextpool and rmextpool commands.
   1. Issue the lsextpool command to obtain a list of extent pool IDs to be removed. Enter the lsextpool command at the dscli command prompt as follows:

      dscli>lsextpool -dev IBM.1750-68FA120 -l -stgtype fb 

      Note:

      • The -stgtype fb parameter allows you to narrow the list so that it displays only those extent pools that are assigned for use with fixed block volumes.
      • Extent pool IDs that indicate assigned ranks = 0 are eligible to be removed. If the assigned ranks are greater than 0, the extent pool potentially contains assigned storage volumes. The rank indicator must be 0 before you can remove the extent pool.
   2. Issue the rmextpool command to delete extent pool IDs that do not contain assigned rank IDs. Enter the rmextpool command at the dscli command prompt as follows:

      dscli>rmextpool -dev IBM.1750-68FA120 P21-P25 P30

      Notes:

      1. All rank assignments must be deleted before the extent pool can be deleted.
      2. The example command displays the use of a range of extent pool IDs plus one additional extent pool ID (P21-P25 P30). A range of extent pool IDs requires the use of a hyphen and a space between the next extent pool ID or next range of extent pool IDs.