Device file name change

[BPatrick]

Hi,
I reseated on of the disks in the EVA and regrouped the diskgroup. After that I noticed disk device file name has changed in the HP-UX servers connected to the EVA. Is this is normal behaviour? If so then on what situation can this happen and is there any solution to prevent this from happening?

[Mark Poeschl_2]

What exactly do you mean by "re-grouped the diskgroup?" Did you at any time delete and re-create Vdisks?

[BPatrick]

One of the disk was went out of the group when I reseated it. so I added that disk back in to the diskgroup. Thats all I have done. I dint do any changes to the Vdisks.

[Sheriff Andy]

Patrick,

Did you by chance reboot your HP-UX box? I am wondering if you have your disks persistent across reboots?

Have you ran these commands?

# spmgr update
# kmadmin -L swspData
# config -M swspData -u

[BPatrick]

Sheriff,
I dont use secure path, instead I use pvlinks. So spmgr is not available.

[Sheriff Andy]

We have had our device file names change on 3 different occasions;

As you said, we do use secure path. We have a EVA 5K, attached to 3 HP-UX systems, and 5 Windows systems.

1) After a reboot, the device file names came up different because we didn't make the disks persistent across reboots.
2) After a datacenter power outage, we had one volume group change its device file names. Everyone else was fine.
3) After an ignite all of the device file names changed.

[krusty]

Is this an EVA 3000/5000(VCS 3.X) or 3000/5000 VCS 4.X or 4/6/8000? If is is the formal, Secure Path is required or you can get weird behavior. This is do to the Active Passive controllers.

On VCS 4.X on the 3000/5000 or all the 4/6/8000's the controllers are Active/Active, so PVlinks are supported.

Curt

[BPatrick]

Its an EVA4000 and i guess secure path is not compatible with the eva 4k

[Mohanasundaram_1]

Hi Patrick,

EVA4000 supports autopath component of the securepath. therefore "autopath display" should display the LUNs and device files.

If you had deleted LUNs and created newer LUNs then the device files can change after the system reboots.

Always remember to delete the LUN from Securepath first and then unpresent the LUNs.
If you had not followed this, you might see the device files changing when your HP-UX system reboots.

With regards,
Mohan.

[BPatrick]

Mohan,
The disks are configured with pvlinks and i am not using securepath or autopath. I got a response from HP that the device names can change if the fibre channel ports change. in my case this has happened when i recently swapped both the cables recently during some test. So I think that answers my question. I will create a link to the new device file which will solve the problem.
Thank you all for your valuable responses. I will assign points and close this case now

[BPatrick]

Thread closed