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Thursday, September 1, 2016

Migrating Fencing diskgroup to new array


There can be several methods to do this task however for me below steps worked very well but if anyone has any better set of instructions doing this then request to share those.

Let's start then -

Output of vxfencing status:
root@lab1:/opt/SAN #  vxfenadm -d

I/O Fencing Cluster Information:
================================

 Fencing Protocol Version: 201
 Fencing Mode: SCSI3
 Fencing SCSI3 Disk Policy: dmp
 Cluster Members:

        * 0 (webap11p)
          1 (webap12p)

 RFSM State Information:
        node   0 in state  8 (running)
        node   1 in state  8 (running)


Old Disk in Fencing DG:
root@lab1:/opt/SAN # vxdisk list|grep fencing_dg
emc0_0e3c    auto:cdsdisk    emc0_0e3c    fencing_dg   online
emc0_0e3d    auto:cdsdisk    emc0_0e3d    fencing_dg   online
emc0_0e3e    auto:cdsdisk    emc0_0e3e    fencing_dg   online



1. If VCS is running, shut it down locally:

# hastop -all -force

2. Stop I/O fencing on all nodes. This removes any registration keys on the disks.

# /etc/init.d/vxfen stop   (on all 2 cluster nodes) (Not Mandatory)

3. Import the coordinator disk group. The file /etc/vxfendg includes the name of the disk group (for example, fencing_dg) that contains the coordinator disks, so use the command -

# vxdg -tfC import 'cat /etc/vxfendg'
                                       OR
# vxdg -tfC import fencing_dg

Where:

-t specifies that the disk group is imported only until the system restarts.
-f specifies that the import is to be done forcibly, which is necessary if one or more disks is not accessible.
-C specifies that any import blocks are removed.

4. Turn off the coordinator attribute value for the coordinator disk group.

# vxdg -g fencing_dg set coordinator=off

5. Add new and Remove old disks

Add disk for fence disk group

# vxdg -g fencing_dg adddisk emc1_0be1=emc1_0be1
# vxdg -g fencing_dg adddisk emc1_0be2=emc1_0be2
# vxdg -g fencing_dg adddisk emc1_0be3=emc1_0be3

Removing old disk from fence disk group

    # vxdg -g fencing_dg rmdisk emc0_0e3c
    # vxdg -g fencing_dg rmdisk emc0_0e3d
    # vxdg -g fencing_dg rmdisk emc0_0e3e
               


6. Set the coordinator attribute value as "on" for the coordinator disk group.

# vxdg -g fencing_dg set coordinator=on

7. Run disk scan on all nodes

# vxdisk scandisks   (Run on all cluster nodes)

8. Check if fencing disks are visible on all nodes

# vxdisk -o alldgs list | grep fen

9. After replacing disks in a coordinator disk group, deport the disk group:

# vxdg deport 'cat /etc/vxfendg'
                                 OR
# vxdg deport fencing_dg

10. Verify if the fencing diskgroup is deported

# vxdisk -o alldgs list | grep fen

11. On each node in the cluster, start the I/O fencing driver:

# /etc/init.d/vxfen start  (on all 3 cluster nodes)

12. hastart on all cluster nodes. 

# hastart  (on all 3 cluster nodes)

That's it, these 12 steps takes you through migrating disks within coordinator disk group from one array to another.


  1. Modify /etc/vxfentab in all the cluster node :
Example:
root@lab1:/opt/SAN # cat /etc/vxfentab
#
# /etc/vxfentab:
# DO NOT MODIFY this file as it is generated by the
# VXFEN rc script from the file /etc/vxfendg.
#
/dev/vx/rdmp/emc0_0e3c EMC%5FSYMMETRIX%5F000290100769%5F6900E3C000
/dev/vx/rdmp/emc0_0e3d EMC%5FSYMMETRIX%5F000290100769%5F6900E3D000
/dev/vx/rdmp/emc0_0e3e EMC%5FSYMMETRIX%5F000290100769%5F6900E3E000

To:
root@lab1:/opt/SAN # cat /etc/vxfentab
#
# /etc/vxfentab:
# DO NOT MODIFY this file as it is generated by the
# VXFEN rc script from the file /etc/vxfendg.
#
/dev/vx/rdmp/emc1_0be1  EMC%5FSYMMETRIX%5F000298700104%5F0400BE1000
/dev/vx/rdmp/emc1_0be2  EMC%5FSYMMETRIX%5F000298700104%5F0400BE2000
/dev/vx/rdmp/emc1_0be3  EMC%5FSYMMETRIX%5F000298700104%5F0400BE3000

Fencing DG with new disk
root@lab1:/root # vxdisk -o alldgs list|grep fencing_dg
emc1_0be1    auto:cdsdisk    -            (fencing_dg) online thinrclm
emc1_0be2    auto:cdsdisk    -            (fencing_dg) online thinrclm
emc1_0be3    auto:cdsdisk    -            (fencing_dg) online thinrclm


Thank you for reading.

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