active dual controllers in HP-UX environments (400677-002, October 2006)

Migrating from an active/passive single controller to active/active dual controllers in HP-UX environments 15

Troubleshooting

To display and verify the status of a volume group, from the server console, enter:

vgdisplay -v /dev/<vg_name>

To activate a volume group, from the server console, enter:

vgchange -a y /dev/<vg_name>

To verify that device filenames and hardware paths did not change, from the server console, enter:

ioscan -fnC disk

To verify that the connection type is properly set for all HP-UX HBAs (profile=hp), from the MSA CLI, enter:

show connections

To verify that hard addressing has been set on direct-connect MSA controllers, from the MSA CLI, enter:

show this_controller_hard_address

To verify that access is granted to the LUNs on each MSA array controller, from the MSA CLI, enter:

show acl

If using LVM PVLinks, add an alternate link to each physical volume in the volume

group.

For example (using the example information from the

ioscan in step 11):

• To add an alternate link to /dev/dsk/c6t0d0, enter:

vgextend /dev/vg06 /dev/dsk/c22t0d0

• To add an alternate link to /dev/dsk/c6t0d1, enter:

vgextend /dev/vg06 /dev/dsk/c22t0d1

• To add an alternate link to /dev/dsk/c6t0d2, enter:

vgextend /dev/vg06 /dev/dsk/c22t0d2

Ensure that the preferred path in the MSA for the LUNs is the same as the primary

PVLinks path.

• In PVLinks, use the following command:

vgdisplay -v /dev/<vg_name>

• In the MSA CLI, use the following command:

show preferred_path <controller_name>

• If the preferred path of the MSA LUNs is not the same as the PVLinks primary path,

change the MSA path. In the MSA CLI, use the following command:

set preferred_path <controller_name> <unit_list>

For the servers that were quiesced during the migration process, do the following from

the server console:

a. Reactivate all LVM volume groups on the MSA.

b. Remount the file systems.

c. Restart all I/O to the MSA storage LUNs.

d. Restart all applications accessing the MSA.

Step Description (continued) Check