topic two device file on same address in Operating System - HP-UX

two device file on same address

mukesh_a — Tue, 03 Oct 2006 21:07:36 GMT

this is regarding HP server model# 9000/887/G70

here we are getting two device on same address
i.e for all hard disk ,
# ioscan -funC disk
Class I H/W Path Driver S/W State H/W Type Description
==============================================================
disk 14 8.0.0 disc3 CLAIMED DEVICE SEAGATE ST34572WC
/dev/dsk/c0t0d0 /dev/rdsk/c0t0d0
/dev/floppy/c0t0d0 /dev/rfloppy/c0t0d0
disk 1 8.2.0 disc3 CLAIMED DEVICE SEAGATE ST34572WC
/dev/dsk/c0t2d0 /dev/rdsk/c0t2d0
/dev/floppy/c0t2d0 /dev/rfloppy/c0t2d0
disk 15 8.8.0 disc3 CLAIMED DEVICE SEAGATE ST34572WC
/dev/dsk/c0t8d0 /dev/rdsk/c0t8d0
/dev/floppy/c0t8d0 /dev/rfloppy/c0t8d0
disk 5 8.9.0 disc3 CLAIMED DEVICE SEAGATE ST34572WC
/dev/dsk/c0t9d0 /dev/rdsk/c0t9d0
/dev/floppy/c0t9d0 /dev/rfloppy/c0t9d0

Re: two device file on same address

Rajeev Shukla — Tue, 03 Oct 2006 22:04:03 GMT

Hi Mukesh,
Which ones are you trying to refer?
I dont see anything wrong with what you have posted above.
Also you can have as many device files corresponding to one H/W address its just which one and for what purpose you use it matters.

Regards
Rajeev

Re: two device file on same address

mukesh_a — Tue, 03 Oct 2006 22:22:40 GMT

i am not understanding why floppy device file are appearing for each hard disk device file

Re: two device file on same address

A. Clay Stephenson — Tue, 03 Oct 2006 22:35:26 GMT

This is rather common in UNIX. For example, the same physical tape drive might have several device nodes associated with it (rewind, norewind, compression on/off, Berkley/ATT style positioning). In your case, a SCSI INQUIRY simply returns DISK so device nodes were built to cover all the combinations and permutation. If this bothers you, simply rm the unused device nodes.

Re: two device file on same address

Bill Hassell — Wed, 04 Oct 2006 11:48:17 GMT

Device files are quite arbitrarily named and created by infs. You must be running an old version of HP-UX where floppies used to be of some use. You can simply remove the /dev/floppy and /dev/rfloppy directory. These device files are identical to the ones in the dsk/rdsk directories. Verify with lssf as in:

lssf /dev/*floppy/*
lssf /dev/*dsk/*