topic Re: ioscan output in Operating System - HP-UX

ioscan output

khilari — Wed, 24 Jan 2007 11:13:46 GMT

hi guys, i wanted to get some concepts straight on the ioscan, below is the output and i have asked questions alongside them.
Thanks

tty 0 8/0/0 mux2 CLAIMED INTERFACE MUX (IS 8 THE SBA, 0 THE LBA?)
/dev/diag/mux0 /dev/mux0

disk 0 8/4.4.0 sdisk CLAIMED DEVICE SEAGATE ST34573WC (8 THE SBA AND 4 THE LBA THEN WHAT IS
4.0)

tape 0 8/16/5.0.0 stape CLAIMED DEVICE HP C1537A (IS 8 THE SBA, 16 THE LBA WHAT IS 5.0.0)

disk 2 8/16/5.2.0 sdisk CLAIMED DEVICE TOSHIBA CD-ROM XM-5701TA
/dev/dsk/c2t2d0 /dev/rdsk/c2t2d0 ( In this the interface is 2 not 0, what does that mean??)

Re: ioscan output

Peter Godron — Wed, 24 Jan 2007 11:28:49 GMT

Hi,
did you see the detailed breakdown in:
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=605061

Re: ioscan output

Peter Nikitka — Wed, 24 Jan 2007 11:40:03 GMT

Hi,

I don't know, what your terms SBA and LBA are meaning - but these numbers mean the hardware path, just as noted in the header line of the ioscan command. From 'man ioscan' (see man page for a more detailled info):
>>
A numerical string of hardware components, notated sequentially from the bus address to the device address.
<<

For scsi devices (like your cdrom, disks and the tape in your output) you see the mapping
HW-path 8/16/5.2.0
to c2t2d0
where first '2' is the path to the scsi controller (8/16/5.), being the 2nd one recognized, and the last components (2.0) you find as "t2d0".

mfG Peter

Re: ioscan output

khilari — Wed, 24 Jan 2007 11:45:50 GMT

sba is system bus adapter and lba is local bus adapter. If u see the hierarchy u will see cpu > sba > lba and then lans or scsi or tty.
Just wanted to know how the highway path is broken down to represent the above..

Re: ioscan output

Sandman! — Wed, 24 Jan 2007 13:03:37 GMT

You can get the I/O tree by starting from the root of the hardware path. For ex. H/W path 8/16/5.2.0 and to get all the devices on that path starting from root do the following:

# ioscan -H 8

Do not consider the instance number as that is a sequential instance number assigned by HPUX which is done as and when the devices are discovered by the machine.

~hope it helps

Re: ioscan output

Torsten. — Wed, 24 Jan 2007 14:43:41 GMT

Hi,

it always depends on the type of your system.

Try to find the LBAs (local bus adapter):

ioscan -fndlba

this will give you something like

# ioscan -fndlba
Class I H/W Path Driver S/W State H/W Type Description
============================================================
ba 0 0/0/0 lba CLAIMED BUS_NEXUS Local PCI-X Bus Adapter (12ee)
ba 2 0/0/1 lba CLAIMED BUS_NEXUS Local PCI-X Bus Adapter (12ee)
ba 3 0/0/2 lba CLAIMED BUS_NEXUS Local PCI-X Bus Adapter (12ee)

another "ioscan" may show you the SBAs (system bus adapter):

ioa 0 0/0 sba CLAIMED BUS_NEXUS System Bus Ada
pter (12eb)

putting this together:

Cell0 gives you the "0"
the connected SBA gives you "0/0"
the connected LBA gives you "0/0/0"

a SCSI/LAN combo card in this slot gives you

ioa 0 0/0 sba CLAIMED BUS_NEXUS System Bus Ada
pter (12eb)
ba 0 0/0/0 lba CLAIMED BUS_NEXUS Local PCI-X Bu
s Adapter (12ee)
ba 1 0/0/0/1/0 PCItoPCI CLAIMED BUS_NEXUS PCItoPCI Bridg
e
ext_bus 0 0/0/0/1/0/4/0 mpt CLAIMED INTERFACE HP AB290-60001
PCI/PCI-X U320 SCSI 2-port U320 SCSI/2-port 1000B-T Combo Adapter
/dev/mpt0

and a connected tape

target 0 0/0/0/1/0/4/0.0 tgt CLAIMED DEVICE

tape 0 0/0/0/1/0/4/0.0.0 stape CLAIMED DEVICE
HP C5683A
/dev/rmt/0m /dev/rmt/c0t0d0BESTn
/dev/rmt/0mb /dev/rmt/c0t0d0BESTnb
/dev/rmt/0mn /dev/rmt/c0t0d0DDS
/dev/rmt/0mnb /dev/rmt/c0t0d0DDSb
/dev/rmt/c0t0d0BEST /dev/rmt/c0t0d0DDSn
/dev/rmt/c0t0d0BESTb /dev/rmt/c0t0d0DDSnb

So in this case we have a tape device with SCSI ID 0 connected to a cell-based server.

With some more nformation (not in this example) I can tell you exactly where the cable is connected.

Welcome to the wonderful worls of hardware-pathes ;-)

Re: ioscan output

Torsten. — Wed, 24 Jan 2007 14:47:56 GMT

again the important part of the "ioscan -fn":

# ioscan -fn
Class I H/W Path Driver S/W State H/W Type Description
==============================================================================
root 0 root CLAIMED BUS_NEXUS
cell 0 0 cell CLAIMED BUS_NEXUS
ioa 0 0/0 sba CLAIMED BUS_NEXUS System Bus Ada
pter (12eb)
ba 0 0/0/0 lba CLAIMED BUS_NEXUS Local PCI-X Bu
s Adapter (12ee)