Adding new LUNs dynamically to a target ID


Adding new LUNs dynamically to a target ID
Prev	Reconfiguring a LUN online that is under DMP control using the Dynamic Reconfiguration tool	Next

Dynamic Multi-Pathing (DMP) provides a Dynamic Reconfiguration tool to simplify the addition of new LUNs to a new or existing target ID. One or more new LUNs are mapped to the host by way of multiple HBA ports. An operating system device scan is issued for the LUNs to be recognized and added to DMP control.

Warning:

Do not run any device discovery operations outside of the Dynamic Reconfiguration tool until the device operation is completed.

In a cluster, perform the steps on all the nodes in the cluster.

To add new LUNs dynamically to a target ID

Start the vxdiskadm utility:
```
# vxdiskadm
```
Select the Dynamic Reconfiguration operations option from the vxdiskadm menu.

Specify the Dynamic Reconfiguration operation to be done. Output similar to the following is displayed:

Specify Dynamic Reconfiguration Operation to be done:
Menu: VolumeManager/Disk/DynamicReconfigurationOperations
 
 1      Add Luns
 2      Remove Luns
 3      Replace Luns
 4      Replace HBA
 
 
 ?      Display help about menu
 ??     Display help about the menuing system
 q      Exit

To add a LUN, enter 1. Output similar to the following is displayed:

Add Luns
Menu: VolumeManager/Disk/DynamicReconfigurationOperations/AddLuns
 
INFO: Refreshing OS device Tree
INFO: Updating VxVM device tree
Add LUNs from array, once done then press 'y' to continue 
or 'q' to quit. :

The following are sample EMC Symmetrix commands:

# symmask -sid 822 -wwn 10000000c989e032 -dir 1c -p 0 add devs 
02b8 -nopr
# symmask -sid 822 -wwn 10000000c989e032 -dir 1c -p 1 add devs 
02b8 -nopr
# symmask -sid 822 -wwn 10000000c989e032 -dir 16c -p 0 add devs 
02b8 -nopr
# symmask -sid 822 -wwn 10000000c989e032 -dir 16c -p 1 add devs 
02b8 -nopr
# symmask -sid 822 refresh -nopr
 
Symmetrix FA/SE directors updated with contents of SymMask 
Database 000290300822

When the prompt displays, add the LUNs from the array.

Output similar to the following is displayed:

Add LUNs from array, once done then press 'y' to continue 
or 'q' to quit. : y
Add Luns
Menu: VolumeManager/Disk/DynamicReconfigurationOperations/AddLuns
 
INFO: Refreshing OS device Tree
INFO: Updating VxVM device tree
INFO: Number of Paths for Lun [emc0_02b8] presented=4
INFO: Updating VxVM device tree

Select y to continue to add the LUNs to DMP.

DMP updates the operating system device tree and the VxVM device tree. The newly-discovered devices are now visible.

------------------------------------------------------
Luns Added
------------------------------------------------------
Enclosure=emc0 AVID=02B8
Device=emc0_02b8 Serial=22002B8000
PATH=hdisk49 ctlr=fscsi0 port=1c-0 [-]
PATH=hdisk11 ctlr=fscsi0 port=16c-0 [-]
PATH=hdisk12 ctlr=fscsi0 port=16c-1 [-]
PATH=hdisk14 ctlr=fscsi0 port=1c-1 [-]
------------------------------------------------------
 
Press <Enter> or <Return> to continue:

Specify the dynamic reconfiguration operation to be done:

Specify Dynamic Reconfiguration Operation to be done:
Menu: VolumeManager/Disk/DynamicReconfigurationOperations

 1	Add Luns
 2	Remove Luns
 3	Replace Luns
 4	Replace HBA


 ?	Display help about menu
 ??	Display help about the menuing system
 q	Exit

Select an operation to perform : q

To exit the Dynamic Reconfiguration tool, enter: q

Initialize the disk.

# vxdisk -eo alldgs list | grep -w emc0_02b8
emc0_02b8    auto:none      -            -           online invalid
hdisk49          Mirror lun
 
If to be used by VxVM and not already initialised, 
run /etc/vx/bin/vxdisksetup  - i <da-name>
 
# /etc/vx/bin/vxdisksetup -i emc0_02b8
 
# vxdisk -eo alldgs list | grep -w emc0_02b8
emc0_02b8    auto:cdsdisk   -            -           online              
hdisk49          Mirror lun

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Removing LUNs dynamically from an existing target ID	Home	Replacing LUNs dynamically from an existing target ID