This answer is extracted from HP web site
Running the following command after having run lvextend:
fsadm -b 262144 /opt
produces the following error message:
"/dev/vg00/rlvol5 is currently XXXXX sectors, size will be increased."
"Attempt to resize /dev/vg00/rlvol5 failed with errno 251."
Why?
CONFIGURATION
HP/UX 10.20
RESOLUTION
Note: errno 251 means "Function not implemented"
errno 251 indicated that the AdvJFS is not properly
installed/configured or the vxadv (advanced driver for VxFS)
is missing from the kernel.
1- Run the following command and make sure the filesets are configured:
swlist -a state -a revision -l fileset AdvJournalFS
The following two filesets should show up as "configured"
and the revision should match that of the OS revision you are running.
The output should look something like this:
AdvJournalFS.VXFS-ADV-KRN B.10.20 configured
AdvJournalFS.VXFS-ADV-RUN B.10.20 configured
1A- If these filesets do not show up, please install the
Online JFS product.
1B- If they show up as "installed" instead of "configured", run
the following command:
swconfig -v AdvJournalFS
2- Start SAM, go into the "Kernel Configuration" area and then
to the "Drivers" area. Make sure the "Current State" is "In"
for the vxadv and vxbase drivers.
vxadv <-------- advanced driver for VxFS
vxbase <-------- base driver for VxFS (not part of Advanced JFS)
2A- If it is not, highlight it, go to the "Actions" menu and click
on "Add driver to kernel". The "Pending State" should now change
to "In".
2B- Go to the "Actions" menu again and click on "Create a new kernel"
This can take a few minutes.
2C- Now, when the system prompts you, click on:
"Move kernel into place and reboot system now"
"Overwrite /stand/system"
"OK"
Note: The new vmunix and system files will now be moved into /stand
and the system will be rebooted.
Please run this procedure only if you are ready to reboot
your system.