Managing Shared Disks

Appendix C. Setting up 7134 disks as twin-tailed volume groups

If you are using 7134 disks to set up twin-tailed volume groups, making and importing the volume groups is the same as on 9333 and 9334 disks, but there is some unique preparation work that needs to be done.

To install the 7134 disks as twin-tailed volume groups:

1. Connect the 7134 drawer to two nodes.
2. Reboot (or run cfgmgr) on both nodes.
3. On each node, run

   lsdev -C | grep "2.0 GB 16 Bit Differential SCSI Disk Drive"
   

   A list of the disks, similar to the following, is output:

   hdisk8  Available 00-14-01-00 2.0 GB 16 Bit Differential SCSI Disk Drive
   hdisk9  Available 00-14-01-10 2.0 GB 16 Bit Differential SCSI Disk Drive
   hdisk14 Available 00-14-01-20 2.0 GB 16 Bit Differential SCSI Disk Drive
   hdisk15 Available 00-14-01-30 2.0 GB 16 Bit Differential SCSI Disk Drive
   hdisk16 Available 00-14-01-40 2.0 GB 16 Bit Differential SCSI Disk Drive
   hdisk17 Available 00-14-01-50 2.0 GB 16 Bit Differential SCSI Disk Drive
   

4. Rerun lsdev and grep for the slot number displayed for the disks in the previous step to get the name of the adapters for these disks. For example, the output from the previous step displayed that the disks are in slot 14:

   lsdev -C | grep "00\-14"
   

   The output from this command looks similar to the following:

   ascsi0  Available 00-14       Wide SCSI I/O Controller Adapter
   vscsi0  Available 00-14-00    SCSI I/O Controller Protocol Device
   vscsi1  Available 00-14-01    SCSI I/O Controller Protocol Device
   hdisk8  Available 00-14-01-00 2.0 GB 16 Bit Differential SCSI Disk Drive
   hdisk9  Available 00-14-01-10 2.0 GB 16 Bit Differential SCSI Disk Drive
   hdisk14 Available 00-14-01-20 2.0 GB 16 Bit Differential SCSI Disk Drive
   hdisk15 Available 00-14-01-30 2.0 GB 16 Bit Differential SCSI Disk Drive
   hdisk16 Available 00-14-01-40 2.0 GB 16 Bit Differential SCSI Disk Drive
   hdisk17 Available 00-14-01-50 2.0 GB 16 Bit Differential SCSI Disk Drive
   

5. As displayed in the above output, vscsi1 is the controller for these disks because it is at 00-14-01; the disks are also coming from 00-14-01. Move the disks from the Available state to the Defined state by removing all the devices except ascsi0 (but don't remove their definition from the ODM). For example:

   rmdev -l vscsi0
   rmdev -l vscsi1
   rmdev -l hdisk8
   rmdev -l hdisk9
         
   ·
   ·
   ·
   
   

   Note:

   Do steps 3, 4, and 5 on both nodes.

6. On one node, use SMIT to change the External SCSI ID from 7 to something else (6, for example).
   1. Enter smit
   2. Select Devices
   3. Select SCSI Adapter
   4. Select Change/Show Characteristics of a SCSI Adapter
   5. Select ascsi0
   6. Change Adapter card SCSI ID to another ID
7. Run cfgmgr on both nodes.
8. Run lspv on both nodes. There should be a physical volume ID for all of the 7134 disks. If there is not a physical volume ID for the 7134 disks, try removing the devices and rerunning cfgmgr. Note that it should not say none in this column.
9. From here, proceed as you normally would to make volume groups, logical volumes, and so forth.