Tuesday, March 12, 2013

Cleaning up the Operating System device tree after removing LUNs - Solaris 10

You must clean up the device tree after removing LUNs. The OS commands may vary for Solaris versions. This procedure uses Solaris 10 .

To clean up the device tree after you remove LUNs

1. The removed devices show up as drive not available in the output of the format command:

2. "413. c3t5006048ACAFE4A7Cd252 drive not available

3. After the LUNs are unmapped using Array management or the command line, Solaris also displays the devices as either unusable or failing.

4. bash-3.00# cfgadm -al -o show_SCSI_LUN | grep -i unusable

5. c2::5006048acafe4a73,256 disk connected configured unusable
c3::5006048acafe4a7c,255 disk connected configured unusable
bash-3.00# cfgadm -al -o show_SCSI_LUN | grep -i failing
c2::5006048acafe4a73,71 disk connected configured failing
c3::5006048acafe4a7c,252 disk connected configured failing

6. If the removed LUNs show up as failing, you need to force a LIP on the HBA. This operation probes the targets again, so that the device shows up as unusable. Unless the device shows up as unusable, it cannot be removed from the device tree.

luxadm -e forcelip /devices/pci@1d,700000/SUNW,qlc@1,1/fp@0,0:devctl

7. To remove the device from the cfgadm database, run the following commands on the Solaris

8. cfgadm -c unconfigure -o unusable_SCSI_LUN c2::5006048acafe4a73
cfgadm -c unconfigure -o unusable_SCSI_LUN c3::5006048acafe4a7c
cfgadm -o unusable_FCP_dev -c unconfigure c2::5006048acafe4a73

9. Repeat step 2 to verify that the LUNs have been removed.

10. Clean up the device tree. The following command removes the /dev/rdsk... links to /devices.

$devfsadm -Cv


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