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a disk in SAN is viewed several times with ioscan

 
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a disk in SAN is viewed several times with ioscan

Hello,
I have a rx7620 system with HP11iv2 installed.
This server is connected to 2 IBM disks attached through 4 Fibre Channels. The 2 IBM disks belong to a SAN.

The strange situation I see is that each disk appears in 12 entries in the output of ioscan -fnC disk (3 entries for fibre channel path)
Why does it occur? I'm expecting that the disk appears only 1 time.

# ioscan -fnC disk
Class I H/W Path Driver S/W State H/W Type Description
===========================================================================
disk 2 1/0/0/3/0.6.0 sdisk CLAIMED DEVICE HP 73.4GST373454LC
/dev/dsk/c0t6d0 /dev/dsk/c0t6d0s2 /dev/rdsk/c0t6d0 /dev/rdsk/c0t6d0s2
/dev/dsk/c0t6d0s1 /dev/dsk/c0t6d0s3 /dev/rdsk/c0t6d0s1 /dev/rdsk/c0t6d0s3
disk 1 1/0/0/3/1.2.0 sdisk CLAIMED DEVICE _NEC DVD_RW ND-3550A
/dev/dsk/c1t2d0 /dev/rdsk/c1t2d0
disk 0 1/0/2/1/0.8.0 sdisk CLAIMED DEVICE HP 73.4GMAW3073NC
/dev/dsk/c4t8d0 /dev/rdsk/c4t8d0
disk 3 1/0/4/1/0.8.0 sdisk CLAIMED DEVICE HP 73.4GMAW3073NC
/dev/dsk/c6t8d0 /dev/rdsk/c6t8d0
disk 12 1/0/6/1/0/4/0.46.0.5.98.0.0 sdisk CLAIMED DEVICE IBM 2107900
/dev/dsk/c19t0d0 /dev/rdsk/c19t0d0
disk 28 1/0/6/1/0/4/0.46.0.5.100.0.0 sdisk CLAIMED DEVICE IBM 2107900
disk 14 1/0/6/1/0/4/0.46.0.10.98.0.0 sdisk CLAIMED DEVICE IBM 2107900
/dev/dsk/c21t0d0 /dev/rdsk/c21t0d0
disk 29 1/0/6/1/0/4/0.46.0.10.100.0.0 sdisk CLAIMED DEVICE IBM 2107900
disk 15 1/0/6/1/0/4/0.46.0.11.98.0.0 sdisk CLAIMED DEVICE IBM 2107900
/dev/dsk/c23t0d0 /dev/rdsk/c23t0d0
disk 30 1/0/6/1/0/4/0.46.0.11.100.0.0 sdisk CLAIMED DEVICE IBM 2107900
disk 16 1/0/10/1/0/4/0.61.0.4.98.0.0 sdisk CLAIMED DEVICE IBM 2107900
/dev/dsk/c25t0d0 /dev/rdsk/c25t0d0
disk 32 1/0/10/1/0/4/0.61.0.4.100.0.0 sdisk CLAIMED DEVICE IBM 2107900
disk 20 1/0/10/1/0/4/0.61.0.7.98.0.0 sdisk CLAIMED DEVICE IBM 2107900
/dev/dsk/c27t0d0 /dev/rdsk/c27t0d0
disk 33 1/0/10/1/0/4/0.61.0.7.100.0.0 sdisk CLAIMED DEVICE IBM 2107900
disk 21 1/0/10/1/0/4/0.61.0.11.98.0.0 sdisk CLAIMED DEVICE IBM 2107900
/dev/dsk/c29t0d0 /dev/rdsk/c29t0d0
disk 31 1/0/10/1/0/4/0.61.0.11.100.0.0 sdisk CLAIMED DEVICE IBM 2107900
disk 23 1/0/12/1/0/4/0.46.0.6.98.0.0 sdisk CLAIMED DEVICE IBM 2107900
/dev/dsk/c31t0d0 /dev/rdsk/c31t0d0
disk 34 1/0/12/1/0/4/0.46.0.6.100.0.0 sdisk CLAIMED DEVICE IBM 2107900
disk 25 1/0/12/1/0/4/0.46.0.9.98.0.0 sdisk CLAIMED DEVICE IBM 2107900
/dev/dsk/c33t0d0 /dev/rdsk/c33t0d0
disk 36 1/0/12/1/0/4/0.46.0.9.100.0.0 sdisk CLAIMED DEVICE IBM 2107900
disk 27 1/0/12/1/0/4/0.46.0.12.98.0.0 sdisk CLAIMED DEVICE IBM 2107900
/dev/dsk/c35t0d0 /dev/rdsk/c35t0d0
disk 35 1/0/12/1/0/4/0.46.0.12.100.0.0 sdisk CLAIMED DEVICE IBM 2107900
disk 5 1/0/14/1/0/4/0.61.0.1.98.0.0 sdisk CLAIMED DEVICE IBM 2107900
/dev/dsk/c13t0d0 /dev/rdsk/c13t0d0
disk 37 1/0/14/1/0/4/0.61.0.1.100.0.0 sdisk CLAIMED DEVICE IBM 2107900
disk 6 1/0/14/1/0/4/0.61.0.8.98.0.0 sdisk CLAIMED DEVICE IBM 2107900
/dev/dsk/c15t0d0 /dev/rdsk/c15t0d0
disk 38 1/0/14/1/0/4/0.61.0.8.100.0.0 sdisk CLAIMED DEVICE IBM 2107900
disk 9 1/0/14/1/0/4/0.61.0.10.98.0.0 sdisk CLAIMED DEVICE IBM 2107900
/dev/dsk/c17t0d0 /dev/rdsk/c17t0d0
disk 39 1/0/14/1/0/4/0.61.0.10.100.0.0 sdisk CLAIMED DEVICE IBM 2107900

I checked that a IBM disk x spans over the fibre channels and it is identified by the same BUS number (98 or 100)
Would be possible to have a command that lists all disks (internal and external), but with only 1 entry for each disk?

Below some other info about the hw configuration.

The machine has 4 HBAs.
The server is connected to 2 switches; each connection with a switch is performed through 2 ports.

# ioscan -funC fc
Class I H/W Path Driver S/W State H/W Type Description
===========================================================================
fc 0 1/0/6/1/0/4/0 fcd CLAIMED INTERFACE HP A9784-60002 PCI/PCI-X Fibre Channel FC/GigE Combo Adapter (FC Port 1)
/dev/fcd0
fc 1 1/0/10/1/0/4/0 fcd CLAIMED INTERFACE HP A9784-60002 PCI/PCI-X Fibre Channel FC/GigE Combo Adapter (FC Port 1)
/dev/fcd1
fc 2 1/0/12/1/0/4/0 fcd CLAIMED INTERFACE HP A9784-60002 PCI/PCI-X Fibre Channel FC/GigE Combo Adapter (FC Port 1)
/dev/fcd2
fc 3 1/0/14/1/0/4/0 fcd CLAIMED INTERFACE HP A9784-60002 PCI/PCI-X Fibre Channel FC/GigE Combo Adapter (FC Port 1)
/dev/fcd3


# ioscan -funC fcp
Class I H/W Path Driver S/W State H/W Type Description
===========================================================================
fcp 0 1/0/6/1/0/4/0.46 fcd_fcp CLAIMED INTERFACE FCP Domain
fcp 1 1/0/10/1/0/4/0.61 fcd_fcp CLAIMED INTERFACE FCP Domain
fcp 2 1/0/12/1/0/4/0.46 fcd_fcp CLAIMED INTERFACE FCP Domain
fcp 3 1/0/14/1/0/4/0.61 fcd_fcp CLAIMED INTERFACE FCP Domain


# ioscan -funC ext_bus
Class I H/W Path Driver S/W State H/W Type Description
===========================================================================
ext_bus 0 1/0/0/3/0 c8xx CLAIMED INTERFACE SCSI C1010 Ultra160 Wide LVD A6793-60001
ext_bus 1 1/0/0/3/1 c8xx CLAIMED INTERFACE SCSI C1010 Ultra Wide Single-Ended A6793-60001
ext_bus 2 1/0/1/1/0/1/0 c8xx CLAIMED INTERFACE SCSI C1010 Ultra160 Wide LVD
ext_bus 3 1/0/1/1/0/1/1 c8xx CLAIMED INTERFACE SCSI C1010 Ultra160 Wide LVD
ext_bus 4 1/0/2/1/0 mpt CLAIMED INTERFACE SCSI Ultra320 A6961-60011
/dev/mpt4
ext_bus 5 1/0/2/1/1 mpt CLAIMED INTERFACE SCSI Ultra320 A6961-60011
/dev/mpt5
ext_bus 6 1/0/4/1/0 mpt CLAIMED INTERFACE SCSI Ultra320 A6961-60011
/dev/mpt6
ext_bus 7 1/0/4/1/1 mpt CLAIMED INTERFACE SCSI Ultra320 A6961-60011
/dev/mpt7
ext_bus 18 1/0/6/1/0/4/0.46.0.5.96 fcd_vbus NO_HW INTERFACE FCP Array Interface
ext_bus 19 1/0/6/1/0/4/0.46.0.5.98 fcd_vbus CLAIMED INTERFACE FCP Array Interface
ext_bus 36 1/0/6/1/0/4/0.46.0.5.100 fcd_vbus CLAIMED INTERFACE FCP Array Interface
ext_bus 20 1/0/6/1/0/4/0.46.0.10.96 fcd_vbus NO_HW INTERFACE FCP Array Interface
ext_bus 21 1/0/6/1/0/4/0.46.0.10.98 fcd_vbus CLAIMED INTERFACE FCP Array Interface
ext_bus 37 1/0/6/1/0/4/0.46.0.10.100 fcd_vbus CLAIMED INTERFACE FCP Array Interface
ext_bus 22 1/0/6/1/0/4/0.46.0.11.96 fcd_vbus NO_HW INTERFACE FCP Array Interface
ext_bus 23 1/0/6/1/0/4/0.46.0.11.98 fcd_vbus CLAIMED INTERFACE FCP Array Interface
ext_bus 38 1/0/6/1/0/4/0.46.0.11.100 fcd_vbus CLAIMED INTERFACE FCP Array Interface
ext_bus 8 1/0/6/1/0/4/0.46.0.255.0 fcd_vbus CLAIMED INTERFACE FCP Device Interface
ext_bus 24 1/0/10/1/0/4/0.61.0.4.96 fcd_vbus NO_HW INTERFACE FCP Array Interface
ext_bus 25 1/0/10/1/0/4/0.61.0.4.98 fcd_vbus CLAIMED INTERFACE FCP Array Interface
ext_bus 39 1/0/10/1/0/4/0.61.0.4.100 fcd_vbus CLAIMED INTERFACE FCP Array Interface
ext_bus 26 1/0/10/1/0/4/0.61.0.7.96 fcd_vbus NO_HW INTERFACE FCP Array Interface
ext_bus 27 1/0/10/1/0/4/0.61.0.7.98 fcd_vbus CLAIMED INTERFACE FCP Array Interface
ext_bus 40 1/0/10/1/0/4/0.61.0.7.100 fcd_vbus CLAIMED INTERFACE FCP Array Interface
ext_bus 28 1/0/10/1/0/4/0.61.0.11.96 fcd_vbus NO_HW INTERFACE FCP Array Interface
ext_bus 29 1/0/10/1/0/4/0.61.0.11.98 fcd_vbus CLAIMED INTERFACE FCP Array Interface
ext_bus 41 1/0/10/1/0/4/0.61.0.11.100 fcd_vbus CLAIMED INTERFACE FCP Array Interface
ext_bus 9 1/0/10/1/0/4/0.61.0.255.0 fcd_vbus CLAIMED INTERFACE FCP Device Interface
ext_bus 30 1/0/12/1/0/4/0.46.0.6.96 fcd_vbus NO_HW INTERFACE FCP Array Interface
ext_bus 31 1/0/12/1/0/4/0.46.0.6.98 fcd_vbus CLAIMED INTERFACE FCP Array Interface
ext_bus 42 1/0/12/1/0/4/0.46.0.6.100 fcd_vbus CLAIMED INTERFACE FCP Array Interface
ext_bus 32 1/0/12/1/0/4/0.46.0.9.96 fcd_vbus NO_HW INTERFACE FCP Array Interface
ext_bus 33 1/0/12/1/0/4/0.46.0.9.98 fcd_vbus CLAIMED INTERFACE FCP Array Interface
ext_bus 43 1/0/12/1/0/4/0.46.0.9.100 fcd_vbus CLAIMED INTERFACE FCP Array Interface
ext_bus 34 1/0/12/1/0/4/0.46.0.12.96 fcd_vbus NO_HW INTERFACE FCP Array Interface
ext_bus 35 1/0/12/1/0/4/0.46.0.12.98 fcd_vbus CLAIMED INTERFACE FCP Array Interface
ext_bus 44 1/0/12/1/0/4/0.46.0.12.100 fcd_vbus CLAIMED INTERFACE FCP Array Interface
ext_bus 10 1/0/12/1/0/4/0.46.0.255.0 fcd_vbus CLAIMED INTERFACE FCP Device Interface
ext_bus 12 1/0/14/1/0/4/0.61.0.1.96 fcd_vbus NO_HW INTERFACE FCP Array Interface
ext_bus 13 1/0/14/1/0/4/0.61.0.1.98 fcd_vbus CLAIMED INTERFACE FCP Array Interface
ext_bus 45 1/0/14/1/0/4/0.61.0.1.100 fcd_vbus CLAIMED INTERFACE FCP Array Interface
ext_bus 14 1/0/14/1/0/4/0.61.0.8.96 fcd_vbus NO_HW INTERFACE FCP Array Interface
ext_bus 15 1/0/14/1/0/4/0.61.0.8.98 fcd_vbus CLAIMED INTERFACE FCP Array Interface
ext_bus 46 1/0/14/1/0/4/0.61.0.8.100 fcd_vbus CLAIMED INTERFACE FCP Array Interface
ext_bus 16 1/0/14/1/0/4/0.61.0.10.96 fcd_vbus NO_HW INTERFACE FCP Array Interface
ext_bus 17 1/0/14/1/0/4/0.61.0.10.98 fcd_vbus CLAIMED INTERFACE FCP Array Interface
ext_bus 47 1/0/14/1/0/4/0.61.0.10.100 fcd_vbus CLAIMED INTERFACE FCP Array Interface
ext_bus 11 1/0/14/1/0/4/0.61.0.255.0 fcd_vbus CLAIMED INTERFACE FCP Device Interface

I need to catch in a unique entry each disk in SAN.
Thanks a lot in advance for your support

Best regards

Michele



6 REPLIES 6
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Honored Contributor

Re: a disk in SAN is viewed several times with ioscan

It's normal to see more than one device per disk because you have multiple paths to the same disk, one for each HBA and host port.

This situation is solved by using a multipath software, like secure path, or using PVLINKS in HP-UX, where you add each device to the same volume group.
Por que hacerlo dificil si es posible hacerlo facil? - Why do it the hard way, when you can do it the easy way?
Highlighted

Re: a disk in SAN is viewed several times with ioscan

Hello Ivan,
thanks a lot for your answer. Please could you send me the links to these products?
I need to check if they are installed in my server.

Thanks
Michele
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Solution

Re: a disk in SAN is viewed several times with ioscan

Hi,
try having a look at this link..this will guide you on how to proceed on logical volume mgmt

http://docs.hp.com/en/B5158-90044/ch04s05.html
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Re: a disk in SAN is viewed several times with ioscan

Highlighted
Honored Contributor

Re: a disk in SAN is viewed several times with ioscan

Hi Michele,

Perhaps you could check if you buy a multipathing software along with your storage, IBM provide SDD for multipathing on HPUX

http://www.redbooks.ibm.com/abstracts/sg246295.html?Open

regards,
Sandy
I never think of the future. It comes soon enough.
Highlighted

Re: a disk in SAN is viewed several times with ioscan

Hi, I solved using IBM SDD for multipath.
I do not know how to increase the points assigned to Sandy.
Please let me know if it is possible.

Regards
Michele