Problem
How to remove NO_HW devices from ioscan in HP-UX without a reboot?
Solution
You can remove the “NO_HW” devices from ioscan by using the command rmsf -k -H <hw_path> and there is no need to reboot the HP-UX system. I have done this on HP-UX 11.31. Follow the below process to remove the NO_HW devices:
Remove NO_HW Deices from HP-UX
- Run the below command to see all devices and identify the devices with NO_HW. Here disk16 is NO_HW device.
# ioscan -fnNC disk disk 5 64000/0xfa00/0x8 esdisk CLAIMED DEVICE 3PARdataVV /dev/disk/disk5 /dev/rdisk/disk5 disk 16 64000/0xfa00/0x2a esdisk NO_HW DEVICE 3PARdataVV /dev/disk/disk16 /dev/rdisk/disk16 - Now run the below command, where 64000/0xfa00/0x2a is the hardware path which is taken from the disk details shown above
# rmsf -k -H 64000/0xfa00/0x2a
- Again run the ioscan command to verify the removed devices. The below details show that NO_HW device has been removed.
# ioscan -fnNC disk disk 5 64000/0xfa00/0x8 esdisk CLAIMED DEVICE 3PARdataVV /dev/disk/disk5 /dev/rdisk/disk5
Now you can see that entry of “NO_HW” has been removed.
If you have lots of NO_HW entries, make a for-loop script that will automate for you.
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