How to change Scsi controller ID on Itanium

[Wang,MinJie]

Hi all
I know that the default value of Scsi controller ID is 7,but I want to change it so I can connect two Itanium server to one storage.
And I know that on HP9000 server I can change it in BCH,so I figure that I can change Itanium in EFI Shell.
So any one could tell me the actual command?
Thanks in advance

[Torsten.]

Use ioscan to find your device file and run

# mptconfig -i 6 /dev/mpt10

Confirm: Do you want to change scsi parameters (y/[n]): y

Scan For Devices to avoid id conflict ... [Passed]
Status .................................. [Successful]

[Hein van den Heuvel]

Hmm,

If you have to ask that question, then you shouldn't be asking.

Why do i say that? Because connecting 2 servers to shared storage is not to be taken lightly. It is NOT a supported configuration and likely to cause trouble.

To do it right, it typically requires extensive qualification and dedicated (cluster aware) software.

What if one of the servers calls for a bus-reset?
Will the other server patiently wait or crash?

How will you synchronze access / prevent double allocation (scsi reservation?).

For an experiemnt/test? Fine, go ahead!
For production use? I'd check my support situation.

Good luck!
You'll need it.

Regards,
Hein.

[Torsten.]

You are right Hein, but consider you can also use disks on a shared bus with only 1 server.

[Sameer_Nirmal · Accepted solution]

From EFI shell, you can run commands
Shell> search all
Shell> map -r
Shell> drivers (to get )
Shell> drvcfg (to get )
Shell>drvcfg -s

Then change the SCSI ID in the adapter properties.

Other EFI utility named "pscsi" could also be used if available/installed with supported adapters like A7173A.