Sun Cobalt Qube 3 Bedienungsanleitung

Disaster Recovery on the

Sun Cobalt™ Qube 3

Appliance

User Manual

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Part Number / Numéro de pièce : 070-00337-02

Date : 06-2001

Contents

P/N 070-00337-02 (June 2001) v

Contents

1 Disaster Recovery on the Sun Cobalt™

Qube 3 Appliance 1

How disaster recovery works 1

Locking the UI databases 2

General steps to perform disaster recovery 3

General notes regarding backup services 4

Knox Arkeia 5

Tailoring the backup service 5

Files associated with Knox Arkeia tailoring 6

Backing up a Sun Cobalt Qube 3 appliance with

Knox Arkeia 6

Performing disaster recovery of a Sun Cobalt Qube 3

appliance with Knox Arkeia 7

Preparing for disaster recovery 7

Performing a disaster-recovery operation 8

Legato NetWorker® 9

Tailoring the backup service 9

Files associated with Legato NetWorker tailoring 9

Backing up a Sun Cobalt Qube 3 appliance with

Legato NetWorker 10

Performing disaster recovery on a Sun Cobalt Qube 3

appliance with Legato NetWorker 10

Preparing for disaster recovery 10

Performing a disaster-recovery operation 11

Technical note 11

Contents

vi P/N 070-00337-02 (June 2001)

Veritas NetBackup 12

Tailoring the backup service 12

Files associated with Veritas NetBackup tailoring 12

Backing up a Sun Cobalt Qube 3 appliance with

Veritas NetBackup 13

Performing disaster recovery on a Sun Cobalt Qube 3

appliance with Veritas NetBackup 14

Preparing for disaster recovery 14

Performing a disaster-recovery operation 15

Configuring client agents on the Sun Cobalt Qube 3 appliance 16

Configuring Knox Arkeia 16

Configuring Legato NetWorker 17

Configuring Veritas NetBackup 17

Disaster Recovery on the

Sun Cobalt™ Qube 3

Appliance

The Sun Cobalt™ Qube 3 appliance supports the use of third-party backup

solutions for performing disaster recovery. The supported backup solutions are:

• Knox Arkeia

• Legato NetWorker®

• Veritas NetBackup

Each of these solutions requires customization to correctly recover the Cobalt

conﬁguration database in the Cobalt Conﬁguration Engine (CCE). This technical

paper describes how disaster recovery works on the Sun Cobalt Qube 3

appliance, the steps required to perform general disaster recovery, and detailed

instructions on how to customize and use each of the speciﬁc backup solutions.

How disaster recovery works

For the Sun Cobalt Qube 3 appliance, the term

disaster recovery

means restoring

the appliance after performing an operating-system (OS) restore operation which

wipes the hard drive clean and returns it to a factory-fresh state. This is also

known as “bare-metal recovery”. The entire appliance must be restored in order

for the conﬁguration database and the machine conﬁguration to be in

synchronization.

For most ﬁles on the Sun Cobalt Qube 3 appliance, disaster recovery is

straightforward: the ﬁles are recovered from the backup service and written to the

ﬁle system. However, the Cobalt Conﬁguration Engine (CCE) requires additional

work and the three supported backup services must be tailored to handle it.

Disaster Recovery on the Sun Cobalt™ Qube 3 Appliance

2 P/N 070-00337-02 (June 2001)

The approach used to recover the conﬁguration database using Knox Arkeia and

Veritas NetBackup works as follows:

Before a backup operation begins, the pre-backup script

cobalt_prebackup

creates an archive of the conﬁguration database in the directory

/var/cobalt/backups

The backup makes a copy of the archive:

/var/cobalt/backups/cce.tar

When the backup is complete, the post-backup script

cobalt_postbackup

deletes the archive.

During the disaster-recovery process, the entire appliance must be restored. This

restores the archive to the directory

/var/cobalt/backups.

When the backup is

complete, you must reboot the appliance; the appliance does not reboot

automatically. During the reboot process, the

cobalt_restore

startup script

detects the archive and restores the conﬁguration database. At this point,

everything should be in a consistent state and disaster recovery is complete.

Legato NetWorker works in a different manner: it recovers the database during

the ﬁle recovery phase since this service permits per-ﬁle scripting at both backup

and recover time. The

cceasm

script is used for this purpose.

Locking the UI databases

For all types of backup, the database for the Server Desktop user interface (UI) is

locked for as short a period of time as possible. For Arkeia and NetBackup, the

Server Desktop UI is locked during the pre-backup creation of the database

archives. NetWorker locks the Server Desktop UI only during the backup of

the CCE database.

☞

Important:

Changes to the conﬁguration of the appliance should

not be made during the backup of the appliance; otherwise, the

conﬁguration of the appliance and the conﬁguration databases may

not be synchronized after the disaster-recovery process is complete.

This is also true for modiﬁcations to system conﬁgurations that do

not use the Server Desktop UI. After disaster recovery, the

appliance may be in an inconsistent state if the conﬁguration

databases and the system conﬁguration ﬁles do not agree.

General steps to perform disaster recovery

P/N 070-00337-02 (June 2001) 3

This begs the question: “So why not lock the UI until the backup ends?”

Unfortunately, that would entail shutting down CCE for an unknown duration

while the machine writes to the backup server. Because this would affect both the

responsiveness of the Server Desktop UI and, potentially, WebMail, Sun

Microsystems decided against locking the UI for the duration of the backup

process.

Sun Microsystems recommends that you schedule backups for times when it is

unlikely that system conﬁguration changes are in progress. Partly for this reason,

most backup systems automatically schedule backups for the early hours in the

morning.

General steps to perform disaster

recovery

The general procedure for performing disaster recovery is as follows:

1. Perform an OS restore to wipe the hard disk drive and return the Sun Cobalt

Qube 3 appliance to a factory-fresh state.

2. Conﬁgure the appliance through the Setup Wizard and return it to the

network. The appliance must be able to communicate with the backup server.

3. Through the Server Desktop UI on the appliance, conﬁgure the backup

service with which you backed up your appliance. The tasks include

enabling the backup client and entering a backup server name. The speciﬁc

conﬁguration information is discussed later in this technical paper.

4. Use the backup solution to perform the recovery.

5. Reboot the appliance.

6. Verify the restoration.

Disaster Recovery on the Sun Cobalt™ Qube 3 Appliance

4 P/N 070-00337-02 (June 2001)

General notes regarding backup

services

The following recommendations are stressed for conﬁguring your backup

service:

1. Backup systems are very sensitive to time. If possible, conﬁgure the

appliance to use a network time protocol (NTP) server to set the clock on the

appliance.

On the Server Desktop UI, select

Administration > System > Time

conﬁgure the time settings or to specify an NTP server.

2. Backup systems are very sensitive to correct DNS conﬁguration.

Ensure that your appliance has both forward and reverse DNS lookups

available to the backup server so that the backup solution functions properly.

For more information on DNS records, see Appendix E in the user manual.

3. Always backup and recover the

/etc

and

/usr/sausalito

directories

together.

These directories contain both the appliance conﬁguration and the CCE

database. Backing up and recovering these directories at different times can

lead to inconsistencies between the conﬁguration of your appliance and the

conﬁguration reported in the Server Desktop UI.

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