topic Re: Virutal device names are showing different on cluster nodes in Operating System - HP-UX

Virutal device names are showing different on cluster nodes

Kommina — Mon, 06 Dec 2010 04:59:53 GMT

Hi All,

We have implemented Oracle RAC on our 11.23 HP-UX clustered servers. Oracle ASM has no functionality to use dual HBA for redundancy, that’s why we use Auto Path. When we assign new to luns to the server, Lun WWN is same on both nodes , but virtual disk names are different. We are not sure whether is really an issue or not. Please on this issue.

-------

From node1
==================================================================
Lun WWN : 50_0-F25E-09E6
Virtual Device File : /hpap/dsk/hpap56
Load Balancing Policy : No Load Balancing
Lun Timeout : Infinite Retry (-1)
==================================================================
Device Path Status
==================================================================
/dev/dsk/c12t2d1 Active
/dev/dsk/c14t2d1 Active

From Node2:

==================================================================
Lun WWN : 50_0-F25E-09E6
Virtual Device File : /hpap/dsk/hpap33
Load Balancing Policy : No Load Balancing
Lun Timeout : Infinite Retry (-1)
==================================================================
Device Path Status
==================================================================
/dev/dsk/c12t2d1 Active
/dev/dsk/c14t2d1 Active

==================================================================

Best Regards,
Naresh

Re: Virutal device names are showing different on cluster nodes

Shibin_2 — Mon, 06 Dec 2010 05:45:59 GMT

I am not really a storage guy to talk about virtual device file from SAN.

From OS point of view, you are not going to use Virtual Device File to create any file system. You will only use Device Path ( i.e. /dev/dsk/c12/t2/d1).

May be you can check with your SAN admin. For file system and access to your application, it only refers to the Device Path, not Virtual Device File.

Re: Virutal device names are showing different on cluster nodes

Shibin_2 — Mon, 06 Dec 2010 05:48:20 GMT

In addition to my earlier post, I just noticed, you are having cluster node. So, the controller path will be different on both nodes.

You need to do ioscan, insf -e first before doing autopath discover followed by autopath display command.

You do it in both node on proper sequence.

1. ioscan -fnC disk
2. insf -eC disk
3. autopath discover
4. autopath display.

Thanks.

Re: Virutal device names are showing different on cluster nodes

Kommina — Mon, 06 Dec 2010 06:05:36 GMT

Hi,

Thanks for your reply. As I know, Oracle ASM using virtual device names.

Regards,
Naresh