topic Re: Mutipathing in Operating System - HP-UX

Mutipathing

Vengatesh — Mon, 14 Feb 2011 08:35:57 GMT

Hi Team ,

i have allocated seven LUNs from IBM SAN box, after scan the Disk in hp-ux its showing the 14 disk , kindly advice how to enable multi-path

Re: Mutipathing

Manix — Mon, 14 Feb 2011 09:04:32 GMT

Please tell whats the OS version & machine model .

you need to add the alternate links /PV links to VGs with VG extend where as from 11iv3 they
are obsolete as "native multipathing " has been devised.

Alternate links are shown in vgdisplay -v output.

Do post the ioscan -fnC disk ,uanme -a ,model
commands output.

Thanks
Manix

Re: Mutipathing

Jorge Pons — Mon, 14 Feb 2011 09:08:17 GMT

Hi

like Manix says, important to know HPUX version.
different version could need multipathing software or not.

If you want5 to create a VG, you can create balancing disks alternating controllers.
Can you post:
ioscan -funC disk

Regards, Jorge

Re: Mutipathing

Vengatesh — Mon, 14 Feb 2011 11:36:08 GMT

# uname -a
HP-UX maa2tamh B.11.31 U ia64 0611235733 unlimited-user license

# ioscan -funC disk
Class I H/W Path Driver S/W State H/W Type Description
=====================================================================
disk 1 0/2/1/0.1.4.0.0.0.0 sdisk NO_HW DEVICE IBM 1 814 FAStT
/dev/dsk/c4t0d0 /dev/rdsk/c4t0d0
disk 2 0/2/1/0.1.4.0.0.0.1 sdisk NO_HW DEVICE IBM 1 814 FAStT
/dev/dsk/c4t0d1 /dev/rdsk/c4t0d1
disk 3 0/2/1/0.1.4.0.0.0.2 sdisk NO_HW DEVICE IBM 1 814 FAStT
/dev/dsk/c4t0d2 /dev/rdsk/c4t0d2
disk 4 0/2/1/0.1.4.0.0.0.3 sdisk NO_HW DEVICE IBM 1 814 FAStT
/dev/dsk/c4t0d3 /dev/rdsk/c4t0d3
disk 5 0/2/1/0.1.4.0.0.0.4 sdisk NO_HW DEVICE IBM 1 814 FAStT
/dev/dsk/c4t0d4 /dev/rdsk/c4t0d4
disk 6 0/2/1/0.1.4.0.0.0.5 sdisk NO_HW DEVICE IBM 1 814 FAStT
/dev/dsk/c4t0d5 /dev/rdsk/c4t0d5
disk 7 0/2/1/0.1.4.0.0.0.6 sdisk NO_HW DEVICE IBM 1 814 FAStT
/dev/dsk/c4t0d6 /dev/rdsk/c4t0d6
disk 8 0/2/1/0.1.4.0.0.0.7 sdisk NO_HW DEVICE IBM 1 814 FAStT
/dev/dsk/c4t0d7 /dev/rdsk/c4t0d7
disk 9 0/2/1/0.1.4.0.0.3.7 sdisk NO_HW DEVICE IBM U niversal Xport
/dev/dsk/c4t3d7 /dev/rdsk/c4t3d7
disk 10 0/5/1/0.1.0.0.0.0.0 sdisk NO_HW DEVICE IBM 1 814 FAStT
/dev/dsk/c6t0d0 /dev/rdsk/c6t0d0
disk 11 0/5/1/0.1.0.0.0.0.1 sdisk NO_HW DEVICE IBM 1 814 FAStT
/dev/dsk/c6t0d1 /dev/rdsk/c6t0d1
disk 12 0/5/1/0.1.0.0.0.0.2 sdisk NO_HW DEVICE IBM 1 814 FAStT
/dev/dsk/c6t0d2 /dev/rdsk/c6t0d2
disk 13 0/5/1/0.1.0.0.0.0.3 sdisk NO_HW DEVICE IBM 1 814 FAStT
/dev/dsk/c6t0d3 /dev/rdsk/c6t0d3
disk 14 0/5/1/0.1.0.0.0.0.4 sdisk NO_HW DEVICE IBM 1 814 FAStT
/dev/dsk/c6t0d4 /dev/rdsk/c6t0d4
disk 15 0/5/1/0.1.0.0.0.0.5 sdisk NO_HW DEVICE IBM 1 814 FAStT
/dev/dsk/c6t0d5 /dev/rdsk/c6t0d5
disk 16 0/5/1/0.1.0.0.0.0.6 sdisk NO_HW DEVICE IBM 1 814 FAStT
/dev/dsk/c6t0d6 /dev/rdsk/c6t0d6
disk 17 0/5/1/0.1.0.0.0.0.7 sdisk NO_HW DEVICE IBM 1 814 FAStT
/dev/dsk/c6t0d7 /dev/rdsk/c6t0d7
disk 18 0/5/1/0.1.0.0.0.3.7 sdisk NO_HW DEVICE IBM U niversal Xport
/dev/dsk/c6t3d7 /dev/rdsk/c6t3d7
disk 0 0/6/0/0/0/0/1/0/0/0.0.0 sdisk CLAIMED DEVICE HP L OGICAL VOLUME
/dev/dsk/c0t0d0 /dev/rdsk/c0t0d0
/dev/dsk/c0t0d0s1 /dev/rdsk/c0t0d0s1
/dev/dsk/c0t0d0s2 /dev/rdsk/c0t0d0s2
/dev/dsk/c0t0d0s3 /dev/rdsk/c0t0d0s3
disk 29 255/1/0.0.0 sdisk CLAIMED DEVICE TEAC DV-28E-V
/dev/dsk/c7t0d0 /dev/rdsk/c7t0d0

Re: Mutipathing

Jorge Pons — Mon, 14 Feb 2011 12:00:54 GMT

Hi

At the moment of ioscan, you dont see the disks, is this correct?

Regards, Jorge

Re: Mutipathing

Manix — Mon, 14 Feb 2011 12:07:44 GMT

>>NO_HW DEVICE ..Looks apart from the boot disk
there is no "HW _detection" for the IBM lunx,
looks some drivers are needed first ,then you
may think about adding the paths.

Better to do in steps -)

Thanks

Manix

Re: Mutipathing

Vengatesh — Mon, 14 Feb 2011 12:26:19 GMT

what driver ?

Re: Mutipathing

Jorge Pons — Mon, 14 Feb 2011 12:31:04 GMT

Hi

I think you have the driver installed (sdisk), and the problem is you dont see the disks. you see the disks, do an ioscan, do a insf, and create the device files, but at this moment, you lose the disk.

Can you revise it?

Manix, I think if the driver is not loaded, the state is Unclaimed.

Regards, Jorge

Re: Mutipathing

Alzhy — Mon, 14 Feb 2011 20:07:55 GMT

Please refer to the HP Third Party Mass Storage Devices support for HP-UX Servers at:

http://www.hp.com/products1/serverconnectivity/mass_storage_devices.html#IBM_ds

Just like cerain versions of non-HP Arrays, there is no Official Support for the FASTiT line of IBM SAN Arrays.

You could have "work arounds" (as I did on EMC CX3 and Hitachi 9585Vs) but such will be un-offically supported.

Hope this helps...

Re: Mutipathing

Manix — Tue, 15 Feb 2011 05:59:50 GMT

>>>>what driver ?

disk 1 0/2/1/0.1.4.0.0.0.0 sdisk >>>NO_HW DEVICE>>> IBM 1 814 FAStT
/dev/dsk/c4t0d0 /dev/rdsk/c4t0d0

Can you see that devices are not really visible.?

Thanks
Manix

Re: Mutipathing

Vengatesh — Wed, 16 Feb 2011 09:04:15 GMT

yes visible

Re: Mutipathing

Alzhy — Wed, 16 Feb 2011 20:11:42 GMT

Oye!

Have you read the 3rd Party Storage Compatibility?

The IBM FASTiT Series is NOT supported. 11.31's multipathing algortihms will not understand its multipathing.

Even if you successfully present it, it will not be a fully supported configuration or will be less optimal.

There are "tweaks" alright using scsimgr gyrations but it will still be unsupported if you will have issues.