Disaster Recovery

Disk Delivery Disaster Recovery of an UNIX Client

 

single user mode:

 

— boot -fl s to boot using already generated vmunix file

 

— boot -fi genvmunix -fl s to boot into the single user

 

mode with the generic kernel.

 

— If the system is already powered up and running, change from the

 

current run level to single-user mode by executing the following

 

command: init s

AIX

— No action is required, because the alt_disk_install command,

 

used to prepare the auxiliary disk, ensures consistent disk image

 

without entering the state of minimal system activity.

Creating an

• If you want to work with the auxiliary boot disk, you have to prepare

Auxiliary Disk

it. Only one bootable auxiliary disk is required per site and platform.

 

This disk has to contain the operating system and network

 

configuration, and has to be bootable.

Preparing the

Backup

Specification

•Provide a Pre-exec script that performs the following:

—Collects all the necessary information about the environment and puts it in an available location in case of a disaster recovery. It is suggested to put it onto a different system which can be accessed easily. The information should cover:

✓Physical and logical storage structure of the storage

✓Current logical volume structure (for example, on HP-UX, using vgcfgbackup and vgdisplay -v)

✓ServiceGuard configuration data, disk-mirroring, striping

✓Filesystems and mountpoints overview (for example, on HP-UX, using bdf or copy of /etc/fstab)

✓System paging space information, for example, on HP-UX, using the output of the swapinfo command

✓I/O-structure overview (for example, on HP-UX, using ioscan -fun and ioscan -fkn)

✓Client network settings

—An emergency copy of the data can also be put into the backup itself. If done so, the information has to then be extracted prior to the actual recovery.

Chapter 10

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