How do I programmatically get the hardware address for a SCSI device?

[Philip A. Reyniers]

I have a C++ program that obtains information about all the SCSI devices installed on a given 11.x server. However, I need to obtain the physical hardware address for a given device using C/C++. Now, I am not referring to using CSTM or ioscan, I am looking for a method of getting the physical hardware address ( i.e. 10/0/14/0.0.0 ) from the device name ( i.e. /dev/rdsk/c0t0d0 ).

Thanks in advance to all that reply.

Philip A. Reyniers

P.S. This thread has been moved from Disk to HP-UX > languages. -HP Forum Moderator

[David Ruska]

What's wrong with using the output of ioscan?

e.g.

# ioscan -Cdisk -fnk
Class I H/W Path Driver S/W State H/W Type Description
======================================================================
disk 0 10/0.5.0 sdisk CLAIMED DEVICE Quantum XP34361WD
/dev/dsk/c0t5d0 /dev/rdsk/c0t5d0
disk 1 10/0.6.0 sdisk CLAIMED DEVICE Quantum XP34361WD
/dev/dsk/c0t6d0 /dev/rdsk/c0t6d0
disk 2 10/12/5.2.0 sdisk CLAIMED DEVICE TOSHIBA CD-ROM XM-5401TA
/dev/dsk/c4t2d0 /dev/rdsk/c4t2d0
#
#

[Philip A. Reyniers]

First, it is a C++ program not a shell program, where I would want to run additional system processes at the additional cost and overhead. Second, I am at a point in the code that I have been able to programmatically replicate the functionality of diskinfo with added information. A recent benchmark I was able to process 65 scsi device files in 2.2 seconds. Try that with diskinfo. Finally, the code MUST be standardized, clean, have low impact, and run in the shortest amount of time.

[Julian Perez_1]

Hello,

I think is not possible to perform this task, because c0t0d0 comes from last 3 numbers in hard path. I mean that 10/0/14/3.2.4 = c3t2d4. It's only an example.

10/0/14 depends on server bus architecture, SCSI or FC card slot, partition number if hard partitions are used, and another tips that are not showed in disk device file.

I know is not the best solution, but you can have a fast ioscan with

# ioscan -kfnC disk (info from kernel)

Maybe you can include a litle script at boot time, including:

# ioscan -kfnCdisk > diskinfo.txt

And then you can work with this text file from your application.

It's only an idea.

Have nice day and best regards,

Julian

[John Hall]

Use "lssf /dev/rdsk/c0t0d0"

[Philip Kernohan]

Philip,

apologies for not having direct experience of using this command but can 'ioconfig' assist you?

Check 'man ioconfig' for more details. Please let us know if this helps otherwise John's idea of lssf looks good.

Regards,
PK

[Pruthviraj HP]

Hi,

The simplest thing for you to do would be (provided your C++ program sits above the file system) use the ioconfig file and read the records using the "union ioconfig_record", the "ioconfig_t" member of this has hw_path_t hw_path and "dyn_major_t" member has driver major numbers.