rootdisk unencapsulation in vxvm
Have you ever in need of rootdisk unencapsulation ever ? situation may be anything like vxvm is no more bootable or you have plan to migrate from vxvm to svm or any other situation where you need to un-encapsulate rootdisk. We are going to discuss about how we can unencapsulate root disk in veritas volume manger running on Solaris.
Unencapsulation simply refers to the reverse process of encapsulation.This is just to make it clear.Encapsulation which is used to protect data on disk.
So lets see how we can achieve considering the fact that you have already informed about the activity to related party and you have approved time to perform this activity.This is the manual procedure of rootdisk unencapsulation in vxvm. This is applicable VxVM version 4.0 onward.
Process of rootdisk unencapsulation in vxvm
1.First of all you need to bring server to OK prompt . # shutdown -y -g0 -i0 2. Boot server in single user mode using any option like below. Use any one method which is feasible for you. ok> boot cdrom -s ok> boot disk -s ok> boot net -s 3.Run fsck on root file system. # fsck -y /dev/rdsk/c1t0d0s0 4. Mount the root filesystem on /a # mount /dev/dsk/c1t0d0s0 /a 5. Backup system file # cp /a/etc/system /a/etc/system.vxvm 6. vi /a/etc/system and remove the following 2 entries rootdev:/pseudo/[email protected]:0 set vxio:vol_rootdev_is_volume=1 7. Backup vfstab # cp /a/etc/vfstab /a/etc/vfstab.vxvm 8. Restore vfstab without veritas # cp /a/etc/vfstab.prevm /a/etc/vfstab 9. Remove root-done # rm /a/etc/vx/reconfig.d/state.d/root-done 10. Recreate install-db # touch /a/etc/vx/reconfig.d/state.d/install-db 11. Unmount /a # umount /a We are almost done till now but hold on we have to perform same on mirror disk as well as till now we have made changes on rootdisk only. 12. Run same steps on mirror disk # fsck -y /dev/rdsk/c1t1d0s0 # mount /dev/dsk/c1t1d0s0 /a # cp /a/etc/system /a/etc/system.vxvm # vi /a/etc/system and remove the following 2 entries rootdev:/pseudo/[email protected]:0 set vxio:vol_rootdev_is_volume=1 # cp /a/etc/vfstab /a/etc/vfstab.vxvm # cp /a/etc/vfstab.prevm /a/etc/vfstab # rm /a/etc/vx/reconfig.d/state.d/root-done # touch /a/etc/vx/reconfig.d/state.d/install-db # umount /a So now we have done same changes to both rootdisk as well as mirror disk. 13. Run fsck again on root and mirror disk finally. # fsck -y /dev/rdsk/c1t0d0s0 & # fsck -y /dev/rdsk/c1t1d0s0 14.sync;sync;reboot 15.Validate server status once available.
That,s it about how we can unencapsulate rootdisk in veritas volume manager. I hope you enjoyed and thanks for reading article till end.
Alternate procedure by vendor script is as follow.Run vxunroot command to
break the encapsulation.