Dynamic Root Disk and MirrorDisk/UX

ManualsBrandsHP ManualsSoftwareHP-UX Dynamic Root Disk

Introduction......................................................................................................................................... 2

Four Disk Scenario – Mirroring the Clone When it is Created ................................................................... 2

Three Disk Scenario – Mirroring the Clone When it is Booted ................................................................... 3

Splitting a Mirror from an Inactive Image to Provide a Free Disk................................................................ 4

How to Mirror vg00 – HP 9000 System ................................................................................................ 6

How to Mirror vg00 – HP Integrity Systems (v2 and v3) ........................................................................... 7

Notifying DRD that the Booted System has Been Mirrored....................................................................... 11

Updating the Inactive Image with the Changes...................................................................................... 11

Automating the Three Disk Scenario..................................................................................................... 12

Two Disk Scenario – Splitting a Mirror to Provide a Clone Disk ............................................................... 12

Glossary........................................................................................................................................... 13

Summary of content (13 pages)

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Dynamic Root Disk and MirrorDisk/UX Introduction......................................................................................................................................... 2 Four Disk Scenario – Mirroring the Clone When it is Created ................................................................... 2 Three Disk Scenario – Mirroring the Clone When it is Booted ...................................................................
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Introduction System administrators frequently use MirrorDisk/UX to create a redundant copy of an HP-UX system as protection against hardware failures. HP’s Dynamic Root Disk (DRD), alternatively, provides a means of protecting against software failures — changes can be staged on an inactive copy of the system and an unchanged copy can be retained for recovery. Because a DRD clone or patched clone will become a booted system, it is desirable to mirror the clone as well.
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• A copy of Dynamic Root Disk DRD is available at no charge by searching for “DRD” on HP’s software depot: http://software.hp.com/. • Two disks that are currently in use as the boot disk and the boot mirror (If the boot mirror has not already been created, the procedure described below in How to Mirror vg00 – HP 9000 System can be used.
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For more information on checking whether MirrorDisk/UX is available, and acquiring it if it is not currently installed, see Four Disk Scenario – Mirroring the Clone When it is Created. • A copy of Dynamic Root Disk DRD is available at no charge by searching on DRD from HP’s software depot: http://software.hp.com/.
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# /usr/sbin/vgdisplay –v drd00 | /usr/bin/grep “PV Name” 3. Tell DRD that the mirror disk is to be removed by running drd_unregister_mirror: # /opt/drd/bin/drd_unregister_mirror mirror_disk Where mirror_disk is the mirror to be split off from the inactive image. The drd_unregister_mirror command will find that the mirror is associated with the inactive image and remove its record of the disk. The un-registration is needed because a system administrator may want to use drd mount to browse the original disk.
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appending s1 on 11iv2 Integrity or _p1 on 11iv3 to the block device special file of the entire disk. 5.
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# /usr/sbin/vgextend /dev/vg00 /dev/dsk/mirror_disk 4. Run the mkboot command to create the boot areas on the disk. (Either the character or block device may be used, but both must exist.) # /usr/sbin/mkboot /dev/rdsk/mirror_disk 5. Run the mkboot command again to update the boot string in the AUTO file. The–lq option ensures that the system will boot without quorum. In the event of the primary boot disk failing this will allow the mirror disk to boot.
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1. Use the following commands to determine the size in megabytes of the (1) EFI, (2) HP-UX, and (3) HPSP partitions on the current boot disk: For 11iv2 Integrity: # /usr/sbin/diskinfo -b /dev/rdsk/boot_disks1 \ | awk '{print $1 / (1024)}' # /usr/sbin/diskinfo -b /dev/rdsk/boot_disks2 \ | awk '{print $1 / (1024)}' # /usr/sbin/diskinfo -b /dev/rdsk/boot_disks3 \ | awk '{print $1 / (1024)}' Where boot_disk is the block device special file of the current boot disk.
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7. Run the pvcreate command on the character device file for the HP-UX (second) partition of the mirror disk, using the -B option to make the disk bootable, and the -f option to overwrite any pre-existing data on the disk: For 11iv2 Integrity: # /usr/sbin/pvcreate –f -B /dev/rdsk/mirror_disks2 For 11iv3: # /usr/sbin/pvcreate –f -B /dev/rdsk/mirror_disk_p2 8.
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# /usr/sbin/lvextend -m 1 /dev/vg00/lvol4 /dev/dsk/mirror_disk # /usr/sbin/lvextend -m 1 /dev/vg00/lvol5 /dev/dsk/mirror_disk ... For 11iv3, specify _p2 for the second partition after the block device special file (for example, /dev/dsk/mirror_disk_p2). 12. Run the following lvlnboot commands to reestablish LVM’s knowledge of the root and boot file systems and primary swap and dump.
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16. This release of DRD does not copy the contents of the HPSP to the clone. There are two methods you can use to populate the service partition on both the clone and the mirror. One alternative is to use the HP Itanium Processor Family Diagnostics and Utilities CD to install the diagnostics to one or more of the disks.
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# /opt/drd/bin/drd mount # /usr/bin/cp /var/opt/drd/registry/registry.xml \ /var/opt/drd/mnts/sysimage_00*/var/opt/drd/registry/registry.xml # /opt/drd/bin/drd umount The LVM infrastructure on the inactive image cannot be updated by LVM commands run on the booted system; they will only change the LVM control information on the booted system itself. Instead, the commands must be run when the system is booted.
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2. Clone the booted system to the newly available mirror disk. If desired, use drd runcmd to patch the clone. 3. Boot the clone. 4. Mirror the newly booted system, using the steps described above in How to Mirror vg00 – HP 9000 System for PA-RISC systems (or How to Mirror vg00 – HP Integrity System for 11iv2 Integrity systems or 11iv3 systems). Although DRD may be notified of the new mirror by calling drd_register_mirror mirror_disk, it is not required.