topic Re: Ioscan command in Operating System - HP-UX

Ioscan command

Amit Jawalkar — Fri, 02 Feb 2007 07:29:32 GMT

What for "u" option used in ioscan command, I have already gone through the Man page of ioscan but still not clear.

Can anybody help me explain it more clearly?

Thanks in advance.

Regards
Amit jawalkar

Re: Ioscan command

Steven Haywood (SA) — Fri, 02 Feb 2007 07:37:07 GMT

-u Scan and list usable I/O system devices instead
of the actual hardware. Usable I/O devices are
those having a driver in the kernel and an
assigned instance number. The -d, -C, -I, and
-H options can be used to restrict listings.
The -u option cannot be used with -k.

Re: Ioscan command

Peter Godron — Fri, 02 Feb 2007 07:45:12 GMT

Amit,
for example, if you have added a brand new type of tape drive, for which there is no driver in the kernel, ioscan may show the device, but will not be able to use it.

ioscan -u will only show you the devices the machine can use. So the difference between the ioscan -u and ioscan would indicate (amongst other things) that a driver may be missing in the kernel.

Hope this answers the initial question.

Please also read:
http://forums1.itrc.hp.com/service/forums/helptips.do?#33 on how to reward any useful answers given to your questions.

Re: Ioscan command

deepakinit — Sat, 03 Feb 2007 05:42:18 GMT

hai,

amit

-u option in ioscan command is used to list the devices that are in use.(ie) it is used to list the devices that r installed in the system which has the driver in the os kernel

Re: Ioscan command

Raj D. — Sat, 03 Feb 2007 06:01:09 GMT

Amit,

As mentioned above ,with -u option it will scan the devices with the kernel drivers that have been loaded in the system , and not the actual hardware that is present on the system, Suppose you have a tape device connected in the system but the stape driver is not loaded , so with -u option it will not scan that device. Check # strings /etc/ioconfig to see the kernel device drivers loaded in the system, At boot time this file is read and the information is stored in the io_tree kernel data structure. To scan all the hardware in real time do not use -u or -k option ,and can be filtered it with the specific requirement like disk or tape or fc.(# ioscan -fnC disk , to list all disks with (f)full listing with device number (n) and (C) for Class=disk)

Cheers,
Raj.

Re: Ioscan command

Peter Godron — Tue, 06 Feb 2007 06:27:01 GMT

Amit,

Could you please complete the thread by awarding points to helpful answers and summarising the solution for you.

This will help resolution of similar problems in the future.

Please see:
http://forums1.itrc.hp.com/service/forums/helptips.do?#33 on how to reward any useful answers given to your questions.

Re: Ioscan command

Reshma Malusare — Tue, 06 Feb 2007 07:04:20 GMT

Hi Amit,
Ioscan command with "u" option will scan only devices with their associated drivers present.