Author : Bibith Dathan
what is DRD ?
Dynamic Root Disk (DRD) is an HP-UX
system administration toolset used to clone an HP-UX system image to an
inactive disk for software maintenance and recovery. DRD is available
for download from the hp software depot for free (software.hp.com).
In case of system crash/OS software
corruption, the system can be booted from the DRD disk(i.e alternate boot
disk). Thus faster system recovery is achieved using this approach(<1hr in
ideal conditions).
DRD toolset additionally offers
solutions such as adding of softwares/patches to the cloned disk online, once
the patches/softwares are installed to the cloned disk, the system can be
booted from the cloned disk. Thereby reducing the system downtime while
installing and updating patches and other software.
DRD is supported on the following
platforms:
- Systems—including hard partitions (nPars), virtual partitions (vPars), and Integrity Virtual Machines (VMs)—running either HP-UX 11i Version 2 (September 2004 or later) or HP-UX 11i Version 3
File systems: LVM and VxVM root volume
Additional product information
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1)
Ensure the product DynRootDisk is installed.
swlist
–i product|grep –i Dyn
2)
Create clone disk:
a. Perform clone preview(-p) to check
the disk size & suitability
/opt/drd/bin/drd
clone –p –v –t /dev/dsk/cxtxdx
b.
To clone OS onto target disk /dev/dsk/c3t3d0:
/opt/drd/bin/drd clone -x overwrite=true -v -t /dev/dsk/c3t3d0
The target disk is put under the vg drdnn and
the drdnn vg is exported.
‘drd mount’ is run to activate the drdnn vg
‘drd clone’ command log is /var/opt/drd/drd.log
3) ‘drd activate’ sets the drd disk to be
primary boot device. Now when the system reboots, it boots from the
drd(alternate boot disk).
#
/opt/drd/bin/drd activate
#
/opt/drd/bin/drd activate –x reboot=true
[This
command sets the drd disk as primary boot disk & as well immediately
reboots the machine]
4)
‘drd mount’
To
perform any software maintenance/installation operations, the drd disk should
have to be mounted first, which means that the drd disk/vg gets activated &
drd /(root) filesystem get mounted under /var/opt/drd/mnts/sysimage_001/
mountpoint. Thereafter we can manually mount other OS filesystems of drd
disk/vg under /var/opt/drd/mnts/sysimage_001/ mountpoint.
For
ex: to mount /opt filesystem of drd disk/vg, we perform:
# /opt/drd/bin/drd mount
# /usr/sbin/mount /dev/drd00/lvol6
/var/opt/drd/mnts/sysimage_001/opt
Once the maintenance operations
are complete, you can perform umount of the drd disk/vg, which shall umount
filesystems & export the drd vg:
# /opt/drd/bin/drd umount.
5) To add patches/pkgs to
the drd disk, you can use the “drd runcmd command”
Here is a sample command used to apply QPKAPPS and QPKBASE to the DRD disk.
# /opt/drd/bin/drd runcmd
swinstall \ -s depot_svr:/var/depots/1123_0706 QPKBASE QPKAPPS
In particular, the drd
clone operation does the following:
• Creates Extensible
Firmware Interface (EFI) partitions on HP-UX Integrity systems
• Creates boot records
• Creates a new LVM volume
group or VxVM disk group and a volume in the new group for each volume in the
root volume group. The volume management type of the clone matches that of the
root group.
• Configures swap and dump
volumes
• Copies the contents of
each file system in the root volume group to the corresponding file system in
the new group
• Modifies particular
files on the clone that identify the disk on which the volume group resides
• For LVM-based systems,
modifies volume group metadata on the clone so that the volume group name is
the same as the original root volume group when the clone is booted
Other
notes:
• The clone that has been created is not visible (when executing
commands such as bdf or
vgdisplay) at the completion of the clone operation. This is because the
file systems on the clone are unmounted and the clone volume group is exported
at completion of the drd clone command.
• The clone volume group and component logical volumes can be made
visible by a drd mount command, which vgimports the clone volume group and mounts the
file systems on the logical volumes. If the root group is named “vg00”, the
imported clone group is “drd00”. More generally, if the root group is name “vgnn”,
the clone group is “drdnn”. If the root group does not have the form “vgnn”,
the clone group name is formed by prefixing the root group with “drd”.
• When the clone is booted, the root group is the same as the
original root group that was cloned.
Author : Dathan
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