To Change Initiator settings for existing host in CLARiiONTo Change Initiator settings for an existing host in CLARiiON

You might want to change the failover mode of the host or intiator type or any of the settings of

host for providing a better failover option or improve performance or as part of best practice.Here

is the process on how to change these settings.

How to change:

These settings can be changed from connectivity status->group edit option ->change the settings

as required (Failovermode, Initiator Type, Arraycommpath)

These can be changed only when there is no I/O from host to array as changes cannot be done

when the host is online. Any changes to the settings done during production will result in access

loss to data.

In case you want to change the failover mode from 1 to 4, when you change failover mode to 4 all

other settings will be changed to default settings and hence it is must to check and change all the

settings as per the requirement when you change any one of them.

Points to Remember:

The Host settings cannot be changed online.

These must be done when host is offline.

When you change the settings of host no I/O should be there from host to array.

when any one of the settings are changed,rest all will be set to array default settings.

You must reboot the host after making the changes offline.

What are all the Initiator settings available for Host in Clariion:

Initiator Type

Arraycommpath

Failovermode

UnitSerialNumber

Intitator Type

Below are the Intiator types available and by default the Initiator type is set to Clariion Open.

Clariion Open

HP Auto Trespass

HP No auto trespass

SGI

Fujitsu Siemens

Compaq/Tur64

Recover Point Appliance

Arraycommpath

This enables or disables a communication path from the server to array when LUN 0 is not

configured on the array.

Enabling arraycommpath from Navisphere instructs the array to present a LUNZ whenever a host

LUN0 does not exist. If a host LUN0 is available to the server (LUN0 bound and no Access Logix or

LUN0 in the Storage Group for the initiator), the status of arraycommpath does not matter. 

If this is enabled from navisphere, that means array will present LUNZ when host LUN0 does not

exist. If a host LUN0 exists then status of arraycommpath can be either enabled or disabled.

A LUNZ is a logical device that allows navisphere agent to pass commands to the array.The LUNZ

devices are created based on the arraycommpath setting in Navisphere.If the arraycommpath is

not set properly during initial configuration then the host will not be able to see the array/LUNs.

Options available

Enabled

Disabled

Failovermode

The type of failover can be set as per the requirement and host OS and existince of powerpath and

many other factors, we have below failover modes avaialble.

More in detail on failover modes can be found at 

http://community.emc.com/docs/DOC-12817

0 – LUN Based Trespass Mode

1 – Passive Not Ready Mode

2 – DMP Mode

3 – Passive Always Ready Mode

4 – ALUA Mode

UnitSerialNumber

This reports the serial number on per LUN or per array basis to the host OS. Unit Serial Number

should always be set to Array except for Solaris. The Solaris Unit Serial Number setting is

dependent on the configuration.

Array

LUN