HP Dynamic Root Disk (DRD) Choosing a target disk, Using DRD for limited disk availability checks

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2.3 Choosing a target disk

CAUTION: It is the system administrator's responsibility to identify a target disk that is not currently in use! Cloning a disk removes all current data on the target disk.

In Example 2-1, the disk with the active system image is /dev/dsk/c2t3d0. You need to choose a free disk to be the target of the drd clone command. Your system may have many more disks than Example 2-1shows.

The target disk must:

•Be a block device special file.

•Be writeable by the system.

•Not currently be in use by other applications.

•Be large enough to hold a copy of each logical volume in the root group.

The target's physical disk need not be as large as the disk allocated for the root group, as long as there is enough space for a copy of each logical volume in the root group. However, the disk needs to be larger than the used space in each logical volume because each logical volume will be created with the number of physical extents currently allocated to the corresponding root group logical volume.

Example 2-1shows three system disks: /dev/dsk/c0t0d0, /dev/dsk/c1t2d0, and /dev/ dsk/c2t3d0. You need to determine which disks are available and large enough.

2.4 Using other utilities to determine disk availability

You can determine which disks are in use with the lvm(7M) (Logical Volume Manager) and VxVM (Veritas Volume Manager) commands. For example, to see which disks are in use by lvm, enter this command:

# /usr/sbin/vgdisplay -v /usr/bin/more

and look in the output for PV Name, which describes physical volumes.

This information is under the Physical Volumes heading. It looks similar to this:

--- Physical Volumes ---

PV

Name

/dev/dsk/c2t3d0

PV

Status

available

Total PE

4340

Free PE

428

Autoswitch

On

You can use the vxdisk -o alldgs list command to display information about all disks managed by VxVM. Do not specify any disk in use by VxVM as a clone target.

The swapinfo command can be used to display information about disks currently used for swap.

The HP System Management Homepage, hpsmh(1M), or System Administration Manager, sam(1M), can be used to investigate the disks on the system and their current usage.

2.5 Using DRD for limited disk availability checks

You can use drd clone with the -poption to get minimal availability information about a disk. (See the following section for an example.)

The drd clone command performs the following checks:

12 Cloning the active system image

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Contents Dynamic Root Disk A.3.10.* Administrators Guide Document Part Number DRD Version Supported Operating Systems Table of Contents Troubleshooting DRD Support and other resources DRD commandsRehosting and unrehosting systems Glossary IndexList of Figures List of Examples Commands overview About Dynamic Root DiskConceptual overview TerminologyDownloading and installing Dynamic Root Disk Cloning the active system image Active system imageLocating disks Locating disks on HP-UX 11i v2 systemsLocating disks on HP-UX 11i v3 Integrity systems # /usr/sbin/ioscan -fnkC disk# /usr/sbin/ioscan -m dsf Using other utilities to determine disk availability Using DRD for limited disk availability checksChoosing a target disk Using drd clone to analyze disk size Creating the cloneCloning the active system image Example 2-7 The drd clone command output Success ErrorExample 2-8 The drd clone command output for SAN disk Adding or removing a diskDRD-Safe commands and Packages Swinstall Swremove Swlist Swmodify Swverify SwjobUpdating and maintaining software on the clone Kctune Update-ux View Kcmodule Kconfig Mkkernel Swm job Updating and managing patches with drd runcmdDRD-Safe patches and the drdunsafepatchlist file Patches with special installation instructions Updating and managing products with drd runcmdSpecial considerations for firmware patches Viewing logs Accessing the inactive system image Mounting the inactive system imagePerforming administrative tasks on the inactive system image Enter the patches into a file such as Compare vxconfigbackup with the clone copy Unmounting the inactive system imageUnmounting the inactive system image Page Overview Quick start-basic synchronizationDrd sync command Determining the list of files in the booted volume groupTrimming the list of files to be synchronized Files that have changed on the clone Copying the files to the inactive clone image Drd sync system shutdown script Page Activating the inactive system image Preparing the inactive system image to activate later# /opt/drd/bin/drd activate # /usr/bin/more /stand/bootconf l /dev/dsk/c2t0d0s2 Undoing activation of the inactive system imageActivating the inactive system image Undoing activation of the inactive system image Page Rehosting and unrehosting systems Rehosting overviewRehosting examples Rehosting a mirrored image Example 7-1 Provisioning a new systemUnrehosting overview # rm /var/opt/drd/registry/registry.xmlPage Troubleshooting DRD Page Support and other resources Contacting HPNew and changed information in this edition Locating this guideRelated information Typographic conventions Find1 Page DRD commands DRD command syntaxDrd activate command HAalternatebootdisk=blockdevicespecialfile Ignoreunmountedfs=truefalseLogfile=/var/opt/drd/drd.log Logverbosity=4Drd clone command Reboot=truefalseVerbosity=3 Default Copyautofile optionTtargetdevicefile Copyautofile=truefalseblockdevicespecialfileEnforcedsa=truefalse Drd deactivate command Drd mount command Example A-1 File system mount points Drd rehost command Devicespecialfile -v-xextended option=value -x-?-Xoptionfile Extended options Drd runcmd command Extended options Drd status command Alternatebootdisk=blockdevicespecialfile Drd sync command Usr/sbin/swlist -l file, orDrd umount command Excludelist=Alternatebootdisk=blockdevicespecialfile Drd unrehost command Fsysteminformationfile Mirrordisk=blockdevicespecialfile Page Booted system GlossarySystem image Index Idisk partition, 10, 11 inactive system file system
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