25.21. Troubleshooting Online Storage Configuration
This section provides solution to common problems users experience during online storage reconfiguration.
- Logical unit removal status is not reflected on the host.
- When a logical unit is deleted on a configured filer, the change is not reflected on the host. In such cases,
lvmcommands will hang indefinitely whendm-multipathis used, as the logical unit has now become stale.To work around this, perform the following procedure:Procedure 25.17. Working Around Stale Logical Units
- Determine which
mpathlink entries in/etc/lvm/cache/.cacheare specific to the stale logical unit. To do this, run the following command:$ ls -l /dev/mpath | grep stale-logical-unit
Example 25.16. Determine Specific
mpathLink EntriesFor example, ifstale-logical-unitis 3600d0230003414f30000203a7bc41a00, the following results may appear:lrwxrwxrwx 1 root root 7 Aug 2 10:33 /3600d0230003414f30000203a7bc41a00 -> ../dm-4 lrwxrwxrwx 1 root root 7 Aug 2 10:33 /3600d0230003414f30000203a7bc41a00p1 -> ../dm-5
This means that 3600d0230003414f30000203a7bc41a00 is mapped to twompathlinks:dm-4anddm-5. - Next, open
/etc/lvm/cache/.cache. Delete all lines containingstale-logical-unitand thempathlinks thatstale-logical-unitmaps to.Example 25.17. Delete Relevant Lines
Using the same example in the previous step, the lines you need to delete are:/dev/dm-4 /dev/dm-5 /dev/mapper/3600d0230003414f30000203a7bc41a00 /dev/mapper/3600d0230003414f30000203a7bc41a00p1 /dev/mpath/3600d0230003414f30000203a7bc41a00 /dev/mpath/3600d0230003414f30000203a7bc41a00p1
