DISK or LUN migration to new server with LVM/File systems without loosing the File system Layout and Data, can be implemented in Linux with a sequence simple steps.

Though not necessary, backup existing data as a precaution, especially if you’re migrating a production Volume.

ON SOURCE SERVER

  • Unmount file systems on source server. (Ensure disk is not in use)
  • Deactivate and Export VG
  • Remove file systems entries from /etc/fstab
  • Unpresent LUNs/Disks from source server (from storage end)


    • ON DESTINATION SERVER

  • Present disk / LUN to destination server (from storage end)
  • Scan for LUNS
  • Import and activate VG.
  • scan LVM and mount the file systems on destination server

    • Steps to run on Source server

    #check if file system is being used. If these commands does not produce any result, that indicates that the file system is not being held by any processes.
lsof /opt/myapps
fuser -cu /opt/myapps

#unmount File system
umount /opt/myapps

#deactivate and export VG
vgchange -an mydata_vg
vgexport mydata_vg

#Remove the filesystem entry from /etc/fstab file.
#Shut down the current system.
#remove LUNS presented to Source server (From storage end)

    Steps to run on Destination server

    #Run a LUN scan
cd /sys/class/scsi_host && for HOST in `ls`; do echo "- - -" > ${HOST}/scan;done

#Check if the LUNS are available
cat /proc/scsi/scsi

#Import the VG on a destination server.
vgimport mydata_vg

#Activate the VG on a destination server
vgchange -ay mydata_vg

#Run below commands to scan for Changes in PV,VG and LV and verify if they are available.
pvscan
vgscan
lvscan
pvs
vgs
lvs

#Crosscheck if LV is activated on the destination server.
#Add filesystem entry to /etc/fstab file.
#Mount the filesystems.
mount -a

#Crosscheck whether it is mounted or not.
df -Th

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