topic Re: device file not created automatically in Operating System - HP-UX

device file not created automatically

somanaboina_522 — Fri, 15 Feb 2013 08:29:08 GMT

Hi everybody,

I have added a LUN to the HP-UX11iv3 server, after adding the LUN the device file not created automatically.

due to this my lvm activity got failed. is it mandatory to run the insf command after adding the LUN.??

Re: device file not created automatically

Torsten. — Fri, 15 Feb 2013 10:29:45 GMT

Usually it get created when running ioscan.

It could cause problems if you present the same LUN# again.

Re: device file not created automatically

somanaboina_522 — Fri, 15 Feb 2013 12:37:50 GMT

Thanks Torsten,

when the kernel finds the new hardware it should create a specaial file for the device ..right??

then why do we need to run ioscan command ??

Re: device file not created automatically

chris huys_4 — Fri, 15 Feb 2013 13:36:54 GMT

Hi,

The kernel finds the new hardware once you run ioscan -fnN on hp-ux 11.31. And on 11.31 the ioscan -fnN will then do automatically the insf -e -v command to create device files for the new hardware.

So on hp-ux 11.31 this is the sequence for the new hardware to get discovered.

1. assign new hardware to the host.

2. run ioscan -fnN

# ioscan -fnN

3. check dmesg//var/adm/syslog/syslog.log to see if indeed the new hardware is found.

# dmesg

# vi /var/adm/syslog/syslog.log

Best Regards,

Chris

Re: device file not created automatically

Bill Hassell — Sat, 16 Feb 2013 00:56:53 GMT

>> when the kernel finds the new hardware it should create a specaial file for the device ..right??

>> then why do we need to run ioscan command ??

The kernel never finds new hardware by itself. ioscan (without the -k option) commands each of the drivers to look for new devices. When found, each driver's response update the memory-resident kernel tables. But device files require filesystem changes, again something that the kernel does not do. Instead, insf must be used to create device files for the new hardware.

Re: device file not created automatically

KALABAYOV89 — Wed, 20 Feb 2013 08:03:26 GMT

insf can delete the file equipment.
After that, you can create a new file by ioscan -fnC disk

Re: device file not created automatically

Robert_Jewell — Wed, 27 Feb 2013 19:23:48 GMT

> insf can delete the file equipment.
> After that, you can create a new file by ioscan -fnC disk

This is NOT correct.

rmsf is used to remove existing device files.

As Bill states above, insf is required to create (or re-create) device files.

-Bob

Re: device file not created automatically

Bill Hassell — Wed, 06 Mar 2013 00:53:14 GMT

rmsf to remove...

But as I discovered, there is an undocumented feature in ioscan (at least the man pages and patch descriptions don't mention this). ioscan apparently does install new device files. This was tested on both PARISC and IA. Note that this was a casual test (one tape drive). But running insf after ioscan will always work on any version 10 and higher (assuming the driver recognizes the new hardware).