topic Re: Secure Path device assignment in Operating System - HP-UX

Secure Path device assignment

Adrian Oldacres — Mon, 23 May 2005 08:11:17 GMT

I have secure path installed on 2x hp-ux 11.11i servers connected to eva via a single switch How can I force secure path to assign the same unit numbers to all disks presented from the eva. The eva disks will be used as shared storage in a vcs cluster. This is what is defined at the moment from a default install:

Node 1:
Storage: 5000-1FE1-5004-9920
Load Balance: Off Auto-restore: Off
Path Verify: On Verify Interval: 30
HBAs: td0
Controller: P5849E1AAR801S, Operational
P5849E1AAR802T, Operational
Devices: c14t0d0

TGT/LUN Device WWLUN_ID H/W_Path #_Paths
0/ 0 c14t0d0 6005-08B4-0010-3699-0000-9000-002F-0000 4

Node 2:
Storage: 5000-1FE1-5004-9920
Load Balance: Off Auto-restore: Off
Path Verify: On Verify Interval: 30
HBAs: td0
Controller: P5849E1AAR801S, Operational
P5849E1AAR802T, Operational
Devices: c16t0d0

TGT/LUN Device WWLUN_ID H/W_Path #_Paths
0/ 0 c16t0d0 6005-08B4-0010-3699-0000-9000-0035-0000 4

I want the Devices (c14t0d0 and c16t0d0) to be presented identically to both nodes - i.e c14t0d0 on both nodes.

Regards,

Adrian

Re: Secure Path device assignment

Jdamian — Mon, 23 May 2005 10:22:27 GMT

Hi Adrian

In a SCSI bus, the C number is the instance number of Controller Card into its class (i.e. ext_bus class). So, 'ioscan -kfnC ext_bus' shows this.

For Secure Path it's the same procedure. Run 'ioscan -kfnC ext_bus' in both nodes...
In node 1, you should find a line like:

ext_bus 14 255/255/0 swsp CLAIMED VIRTBUS HSV100 HP 0x59901FE15BBAB7E0

In node 2

ext_bus 16 255/255/0 swsp CLAIMED VIRTBUS HSV100 HP 0x59901FE15BBAB7E0

I think it's the kernel who assigns the instance numbers in a class.

These instance number may be changed using 'ioinit' command. There is a known procedure to achieve this. READ IT BEFORE RUNNING ioinit command. The docID is A5078754.

Re: Secure Path device assignment

Jdamian — Mon, 23 May 2005 10:24:44 GMT

check doc KBRC0004879.

Re: Secure Path device assignment

Sanjay_6 — Mon, 23 May 2005 10:25:27 GMT

Hi Adrian,

you are probably talking about identical mapping of the disk device files on the two server. This link may help you do that.

http://www6.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000073838415

The itrc doc id is KBRC00004879.

Hope this helps.

Regds

Re: Secure Path device assignment

Turlough McKeown — Tue, 31 Jan 2006 17:49:10 GMT

How can document KBRC0004879 be accessed please?