Basics of DRD (Dynamic Root Disk) + HPUX

Basics of DRD (Dynamic Root Disk):

Product: DynRootDisk

1) DRD toolset is used to clone HPUX system image to an inactive disk for software update, maintenance, recovery & reshosting.

2) When modifications on cloned system image is done then we can boot the cloned system image on the original system or on a different system (rehosting)

3) Reduces system down time.

4) We can use DRD to clone HP-IVM

Basic commands used in DRD:

1.       #drd status à to see status of primary disk and clone disk also shows information of current boot disk and the server will rebooted by which disk.

2.       #drd clone à to clone primary root disk with inactive disk. It copies LVM volume group vg00

3.       #drd activate à it mention that the inactive system image to boot either immediately or the next time the system boots.

4.       #drd deactivate à used for “undoing” a drd activate command.

5.       #drd mount à to mount all file systems of the cloned image

6.       #drd runcmd à runs a DRD-safe command on the cloned (inactive) system image

Let’s take a example of Patching a server using DRD:

1. Create DRD clone

# drd clone -x overwrite=true -v -t [inactive disk name]

2. mount DRD

# drd mount

3. check DRD

# lvlnboot -v

# vgdisplay drd00

4. Apply the patches on the mounted clone

# drd runcmd swinstall-s /tmp/patch.1.deopt

5. Check the installed patches

# drd runcmd swlist patch.1

6. Activate the image and reboot the server

# drd activate -x reboot=true

Thanks...

Kiran Jadhav

**Let's Share knowledge and keep visiting here**