TimeFinder (SUN)

Summary:

In this exercise, students will explore the Volume Manager considerations when making  File systems on BCVs and Standard Volumes available to the same SUN host simultaneously. The process of establishing a BCV pair copies all data from the Standard Volume to the BCV, including the LVM label. This results in the disk not being uniquely identified. Procedures required to resolve this duplication will be studied in this exercise.  

Objectives:

a)    Establish BCVs with Standard Volumes and verify that they are fully synchronized.

b)    Split the BCVs and the Standard Volumes.

c)     Make the data on the BCVs available to the same host.

d)    Re-establish the BCVs and the Standard Volumes.

1.   Verify that the Volume Group and file system you created in the previous exercise is available.

a)     Verify that the file systems are mounted and contain data.
# mount
# ls –al /mymp1(2)

2.   Verify that the SYMCLI Device Group contains the correct devices.

a)     Use the following SYMCLI commands to list and verify the Device Group you created in the previous exercise.
  # symdg list
 # symdg show mystddg | more

b)     Verify that the associated BCVs are available to your host.
# symbcv list pd

c)      Check the environment variables for SYMCLI and if necessary set the SYMCLI_DG variable to your device group.  Note: Variables are case sensitive.
# symcli –def
# SYMCLI_DG=mystddg
# export SYMCLI_DG

3.   Establish, synchronize, and split your BCVs. Stop all activity to the Standard Volumes before the split to ensure a complete and consistent copy on the BCVs.

a)     If the BCVs are not already established and synchronized, perform an establish operation now, else go to step 3(c).
# symmir –full establish

b)     Verify that BCV is fully synchronized.
# symmir query –i 10

c)      Unmount the file systems on the Standard Volumes.
# umount /mymp1(2)
 

d)     Split the Standard Volumes and the BCVs.
# symmir split

Duplicate disk identifiers on the BCVs.  When a BCV is established to a Standard Volume, all information is synchronized from the Standard to the BCV, including the LVM label.  To view the mirrored data on the BCV volumes, we will need to mount the BCV volumes to a unique mount point.

4.      Create new directories for the BCV volumes

# mkdir /bcvmp1(2) 

5.      Mount  the file systems.
# mount /dev/dsk/c#t#ds0 /mymp1(2)

# mount /dev/dsk/c#t#ds0 /bcvmp1(2)

a)     # diff /mymp1(2) /bcvmp1(2)

This concludes the TimeFinder. Please unmount your file systems, remove the mount point directories, and delete the SYMCLI Device Group mystddg.

1.  umount /mymp1(2)

2.  umount /bcvmp1(2)

3.  rmdir /mymp1(2)

4.  rmdir /bcvmp1(2)

5.        symdg –force delete mystddg

  Good Luck!