Step 1:

Backup the root VG (VG00)

#make_tape_recovery -Av

Take backup of strings /etc/lvmtab file

#cp –p /etc/lvmtab /etc/lvmtab_bak

Step 2:

Take backup of cluster configuration file /etc/cmcluster/*

Step 3:

Take backup of “ #ioscan -fnC disk “ output.

Step 4:

Take backup all vg* information and vgid information by executing the below command

#xd -j8200 -N16 -tu <disk device filename in the vg>

For example

#xd -j8200 -N16 -tu /dev/rdsk/c4t0d1

Step 5:

Assign LUN's from new storage to both nodes.

Step 6:

Check the status the news luns are getting detecting in the both nodes. by comparing the ioscan output which you have taken.

#ioscan –fnCdisk

#insf

Step 7:

#pvcreate <raw device file name>

For ex:

#pvcreate /dev/rdsk/c0t6d1

Step 8:

Check whether lv's are stripped before adding disk to vg. Before steps works fine for non-stripped lv's

Allocate the disk to vg by using vgextend.

#vgextend vg01 <new lun device file>

For ex:

#vgextend vg01 /dev/dsk/c0t6d1

Step 9:

Do mirroring of lv's in the vg.

#lvextend -m 1 <lvname> <new disk device>

for ex:

#lvextend -m 1 /dev/vg01/lvol1 /dev/dsk/c0t6d1

Continue the above steps for all remaning lvs

Step 10:

Check the mirror status of all LV's

#lvdispaly <lvname>

You will get the below output and check the mirror copies column it should be 1

# lvdisplay /dev/vg00/lvol3

--- Logical volumes ---LV Name /dev/vg00/lvol3VG Name /dev/vg00LV Permission read/writeLV Status available/syncdMirror copies 1

Step11:

Once you confirmed the its mirrored the remove the old disk from the vg.

# lvreduce <lvname> <old disk device> file

Do for all remaining lv's

for ex:

#lvreduce –m 0 /dev/vg01/lvol1 /dev/dsk/c3t6d0

#vgreduce /dev/vg01 /dev/dsk/c3t6d0 [Where /dev/dsk/c3t6d0is the old disk]

# rmsf –a /dev/dsk/c3t6d0

**Note: (Remember to reduce the disk from vg before doing rmsf)

Now unpresent the old LUN from EVA command view

Step 13: Now we need to Follow the below steps provided which is as follows:

Node1:

node1#vgexport -p -v -s -m /tmp/vg01.map vg01

-p: is only preview, not delete.-s: take ssid from disk, secure for to take another disk-v: verbose-m: map file

now copy this map file to node2

node1#scp /tmp/vg01 node2:/tmp

On node2 remove the existing configuration of vg01 and import it with new map file. Also note down the minor number vg01 before removeing.

Node2:

node2# ll /dev/vg01/groupnode2# vgexport -v /dev/vg01node2# mkdir /dev/vg01node2# mknod /dev/vg01/group c 64 0x010000node2# vgimport -v -s -m /tmp/vg01.map vg01

Step 14:

If your cluster contains lock disk you need to change the device file to check whether your cluster contains lock disk triger the below command.

#cmgetconf ( for more details check the man page)

Remove a specific device file: # rmsf /dev/dsk/c0t3d0

Remove all the device files associated with a device: # rmsf -a /dev/dsk/c0t3d0

Or … specify the device’s hardware path: # rmsf –H 0/0/1/0/0.3.0

create a ascii file.

To generate the cluster ASCII configuration file for clusterA, andstore the information in clusterA.config, do the following:

For ex:

#cmgetconf -c clusterA /tmp/clusterA.ascii

Step 15:

Edit clusterA.ascii and change the cluster lock disk and save it

Step 16:

To verify the cluster configuration and package files, do thefollowing:

#cmcheckconf –v -C clusterA.ascii [-P pkg1.config -P pkg2.config]

#cmapplyconf –v –C clusterA.ascii

Step 17:

Start the cluster and package.

# cmruncl -f –v –n scp1

# cmrunnode scp2

#cmrunpkg -n scp1 –v cdrpkg

#cmmodpkg –v –e scppkg

# cmviewcl -v

# cmmodpkg –v –n scp1 scppkg

Total Procedure Summary:

Normally storage migration comprise these steps.

1. Assign LUN's from new storage to both nodes.

2. Add the new luns to respective volume groups by vgextend.

3. Use mirror or pvmove to copy the data from old storage luns to new luns. Prefer to go for mirror. pvmove is always little risky

4. Remove the mirror copy from old storage luns

5. vgreduce the old storage luns from respective volume groups

6. Remove the device files and unpresent from the old storage.

7. Take the map file and import on other nodes

8. Reinitialize the cluster lock disk.