HP Data Protector IDB Purge Bedienungsanleitung

HP Data Protector IDB Purge best practices

Commands that purge obsolete data from the HP Data Protector

(DP) software Internal Database (IDB), to maintain the IDB in

good condition

Table of contents

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

Scope............................................................................................................................................. 2

Three step guide to use this white paper ............................................................................................. 2

How to identify if a DP IDB needs filenames purging? .............................................................................. 3

Automated discovery........................................................................................................................ 3

Manual discovery ............................................................................................................................ 4

Automated IDB purging done by the Daily Maintenance........................................................................... 5

What is the Daily Maintenance? ........................................................................................................ 5

Setting the time Daily Maintenance runs ............................................................................................. 5

Methods to confirm if, and when, Daily Maintenance is being run ......................................................... 5

If Daily Maintenance is not running .................................................................................................... 6

IDB purging done by the Daily Maintenance........................................................................................... 6

Sessions purge................................................................................................................................. 6

Messages purge .............................................................................................................................. 6

Dcbf purge...................................................................................................................................... 7

Mpos purge .................................................................................................................................... 7

Manual IDB purge operations ............................................................................................................... 8

Filenames purge .............................................................................................................................. 8

The consecutive running of a dcbf Purge followed by a fixmpos............................................................. 9

Appendix A ........................................................................................................................................ 9

What does “Requires exclusive access to the IDB”mean? ..................................................................... 9

Appendix B....................................................................................................................................... 11

Further information about the IDB Daily Maintenance: ........................................................................ 11

Appendix C ...................................................................................................................................... 12

Example update to purge.log after a completed forced filenames purge ............................................... 12

Appendix D ...................................................................................................................................... 13

Failed_copies purge ....................................................................................................................... 13

For more information.......................................................................................................................... 14

Glossary........................................................................................................................................... 14

Introduction

Growing volumes of backup data can significantly load the Data Protector (DP) Internal Database

(IDB). Regular IDB maintenance to purge obsolete data can prevent size related problems.

Purges remove obsolete data from the database, making space available within the database. The

space created by the purges can be used by new DP sessions, delaying the requirement for the IDB to

be extended.

This document presents some Data Protector commands that can help keep your Internal

Database healthy.

This white paper is complementary to the white paper HP Data Protector software cell manager

planning and sizing. Please also follow the recommendations therein to facilitate reliable Data

Protector operation.

This White Paper can be found at: http://www.hp.com/go/dataprotector --> Support Matrices -->

HP Data Protector V6.0 Software

Scope

This document covers Cell Managers on HP-UX or Windows, but the principals apply to Cell

Managers on other platforms as well. This document covers DP versions 5.5, 6.0, and 6.1.

Three step guide to use this white paper

Note:

Before running any of the commands outlined in this document HP

recommends you make a successful backup of the DP IDB.

Step One:

How to identify if a DP IDB needs a filenames purge?

Step Two:

Automated purging done by the Daily Maintenance and making sure these tasks are taking place.

Step Three:

Manual IDB purge operations.

How to identify if a DP IDB needs filenames purging?

There are two ways to identify if a DP IDB needs filename purging:

Automated: Part of the daily health check combined with the DP Reporting feature

Manual: Using DP Command line interface (CLI) or running preconfigured IDB reports

Automated discovery

By default, Data Protector checks the condition of the IDB once a day as a part of the daily health

check mechanism. The start time of the check is defined by the global file parameter DailyCheckTime.

# DailyCheckTime=HH:MM

# default: 12:30

# This option is used for starting daily checks at first

# omnitrig run after the specified time each day. Valid values

# are hour:minute, using the twenty-four hour clock notation

# Specifying “None” disables starting daily checks.

The global file is located on the DP Cell Server under:

Windows (default) C:\Program Files\OmniBack\Config\Server\Options\global

HP-UX/SUN Solaris/Linux (default) /etc/opt/omni/server/options/global

The daily check triggers an “IDB Purge Required” notification if:

•The time elapsed since the last IDB filename purge exceeds Days Last Purge [days] (default, 180

days). At the same time, either the number of filename records likely to be purged exceeds Num.

Estimated Filenames [mio] (default, 6 millions) or the estimated time needed for the purge exceeds

Estimated Time Purge [min] (default, 120 minutes).

•The number of filenames in the IDB exceeds Num. Filenames [mio] (default, 100 millions).s

The filenames purge check carried out as part of Daily Check can be system resource intensive.

Therefore, under some circumstances, it might be useful to deactivate this part of the daily health

check. It can be switched off by setting the (undocumented in DP 5.5/6.0) global parameter

DbPurgeCheck = 0:

# DbPurgeCheck = 0 or 1

# default: 1

# If this option is set (=1), IDB purge check will be included

# when daily check is started. If this option is not set (=0),

# IDB purge check will be skipped. DbPurgeCheck=0

If the purge check is switched off as part of the daily health check it needs to be executed manually

on a regular basis.

Manual discovery

A filenames purge preview status report can be manually created either using the DP command line

interface (CLI) or the GUI.

•DP CLI:

omnirpt –report db_purge_preview

•DP GUI:

Reporting context, right click on “Reports” and select “Add Reporting Group.” Choose a name

and click on “Finish.” Right click on the newly created Report group, and select “Add Report.” In

the right pane select the icon to the left of “Reports on the Internal Database.” Choose a name

and in the “Type:” field select “IDB Purge Preview Report.” Click “Next.” For “Send method:”

select “Log”, for “Log to file:” select a temp directory and for “Format:” select “ASCII.” Click on

“Add” and then “Finish.” To run the report right click on it and select “Preview.”

Both the preceding points will give an output similar to:

Client # Filename # Est. Obs Est. Durat

________________________________________________________________

alpha.xxxx.com 110 30 23

beta.xxxx.com 481 87 100

delta.xxxx.com 80 0 16

gamma.xxxx.com 0 0 0

zeta.xxxx.com 122 42 25

eta.xxxx.com 17 0 3

theta.xxxx.com 506 134 105

Note:

You either have to be added to the Admin user group or granted the

Reporting, notifications, and Event Log user right.

Automated IDB purging done by the Daily Maintenance

What is the Daily Maintenance?

Daily Maintenance runs a series of commands that purge obsolete data from many sections of the DP

IDB. By default, the Daily Maintenance takes place at midday (12:00 Hrs.) each day. It does not

purge all parts of the IDB, just the parts that can be done without exclusive access to the IDB. (For

more information about this, see the Appendix A.)

Setting the time Daily Maintenance runs

The time the Daily Maintenance runs can be changed by the setting Daily Maintenance Time in the

global file.

The Daily Maintenance can be disabled by setting Daily Maintenance Time = 99:99 or None in the

global file.

Note:

Disabling daily maintenance is not recommended by Hewlett Packard,

unless alternative arrangements to maintain the DP IDB have been made.

Methods to confirm if, and when, Daily Maintenance is being run

Method 1

Look at the global file for the values of Daily Maintenance Time:

On Windows the file is (default) C:\Program Files\OmniBack\Config\Server\Options\global

On HP-UX the file is /etc/opt/omni/server/options/global

For example if you only see

# DailyMaintenanceTime=HH:MM daily maintenance is running at 12:00

If you see

DailyMaintenanceTime=99:99 daily maintenance is disabled

DailyMaintenanceTime=None daily maintenance is disabled

DailyMaintenanceTime=08:30 daily maintenance is running at 08:30

Method 2

Run the command omnicc -debug 20 CHECK.txt, and look at the output debug file which will:

•Be in (default)/tmp on HP-UX

•Be in (default) C:\Program Files\OmniBack\tmp on Windows

•Have file name ending with CHECK.txt.

Look through the output file for name=DailyMaintenanceTime and see the value:

For example if you see

value=12:00 daily maintenance is running at 12:00 hrs

value=99:99 daily maintenance is disabled

value=None daily maintenance is disabled

value=20:30 daily maintenance is running at 20:30 hrs

If Daily Maintenance is not running

In case Daily Maintenance is disabled consider the following steps:

1. In the global file set a time for the daily maintenance to run.

2. Manually run the daily maintenance with the command omnidbutil –purge –daily.

3. Manually run individual purges that do similar steps to the daily maintenance.

For example

omnidbutil -purge –sessions 30

omnidbutil -purge –messages 10

omnidbutil -purge –dcbf

omnidbutil -purge –mpos

IDB purging done by the Daily Maintenance

Sessions purge

Expired sessions, older than a certain number of days, are removed from an IDB with the command

omnidbutil -purge –sessions [TimeInDays].

For example omnidbutil -purge –sessions 30 removes all expired protection sessions from

the IDB that are more than 30 days old.

Example of messages seen at the command line

omnidbutil -purge -sessions 30

DONE!

Messages purge

Session messages from expired sessions, older than a certain number of days, are removed with

omnidbutil -purge –messages [TimeInDays]

Example of messages seen at the command line

omnidbutil -purge -messages 10

DONE!

Dcbf purge

omnidbutil -purge –dcbf removes obsolete data from the dcbf part of the internal database.

Example of messages seen at the command line

omnidbutil -purge -dcbf

DONE!

Mpos purge

Note:

This purge is available by default on DP 6.1, but for DP 5.5 and 6.0 it

requires one of the following patches or their successor.

Windows HP-UX PA Risc HP-UX IA 64

Data Protector 5.5 DPWIN_00396 PHSS_38726 PHSS_38727

Data Protector 6.0 DPWIN_00385 PHSS_38404 PHSS_38405

During 2008 new global file functionality, QuickMediaFormat=1was introduced.

In the course of backups, DP may need to overwrite a media. For tapes containing a large number of

objects and corresponding media positions the purging of these object versions and media position

records within the IDB can put a high and sustained load on the process that manages the DP IDB

(known as RDS). The sustained high load on RDS may give the false impression that DP has hung. This

behavior today is observed more by DP users past because of the large amount of data modern tapes

can hold.

If QuickMediaFormat is set to 1 in the global file, DP will not purge any records during a backup or

when a media is formatted. Those obsolete records will be explicitly removed when a purge mpos

command is run. If the QuickMediaFormat is not set, the records will be purged from the database

during the course of the backup.

The command omnidbutil -purge -mpos can be run at other times to remove all the object

versions and media position records for the overwritten tapes.

The installation of one of the Cell Server patches in the preceding table changes the Daily

Maintenance to include omnidbutil -purge -mpos. So, this purge will take place every day as long as

Daily Maintenance has not been disabled.

Example of messages seen at the command line

omnidbutil -purge -mpos

Starting Purge for formatted medium (-mpos)

Successfully completed Purge for formatted medium (-mpos)

DONE!

Manual IDB purge operations

Note:

These commands require Exclusive Access to the IDB, so that no backups

are running or no GUIs are open.

On some very busy Cells it can be difficult to book time when no backups are running. This problem

may be greater if the Cell Manager is part of Manager of Managers (MoM), as all backups have to

be stopped on all Cells in the MoM, in order to run the commands that require exclusive access to the

IDB.

Filenames purge

A filenames purge removes obsolete data from the filenames part of the IDB, but leaves filenames

records referring to protected data intact.

Running a DP IDB filenames purge requires exclusive access to the DP IDB, so no backups can be in

progress and all GUIs must be closed. In a MoM environment, DP must not be busy with backups or

other activities anywhere on the MoM.

Run a filenames purge on a DP Cell Manager as follows:

•Verify that no backups or restores are in progress by checking that “omnistat” returns:

“No currently running session“

•Start the purge:

omnidbutil -purge -filenames -force

Note:

Occasionally it will be necessary to stop (omnisv -stop) and start again

(omnisv -start) DP before the command will run.

If DP is running within Microsoft Cluster Services (MCSC) or

MC/ServiceGuard then omnisv -stop and omnisv -start may not be the

appropriate way to stop and start DP.

You can monitor the filenames purge in two ways:-

•Start one GUI and look in the Monitor context

•Look at the file (default location):

on windows C:\Program Files\OmniBack\log\server\purge.log

on HP-UX /var/opt/omni/server/log/purge.log

See Appendix C for an example of the update to purge.log of a completed filenames purge.

If the purge has not finished, but you need to run backups simply stop the purge with

omnidbutil -purge_stop and use DP as normal.

Later, when you have time, start the purge again as previously explained.

Example of messages seen at the command line

omnidbutil -purge -filenames -force

Filename purge session started.

Frequently Asked Questions about filenames purge

Question 1:

Will the force option cause the filenames purge to remove protected data?

Answer 1:

No, a force purge will not remove any protected data from the DP IDB.

A purge without the force option looks for obsolete records for a hostname and only purges those

records if there are more than 1000000 obsolete entries.

The –force switch causes DP to purge all expired records even if there are less than 1000000 expired

records for a hostname. For this reason the command is much more effective if the –force switch is used.

Question 2:

What happens to scheduled backups that are due to start while the omnidbutil -purge -

filenames is running.

Answer 2:

Scheduled backups will not start if a filename purge is in progress.

The consecutive running of a dcbf Purge followed by a fixmpos

omnidbutil -purge –dcbf, deletes the dcbf records that are no longer required. However, the

mmdb will still have mpos records referring to these removed dcbf records.

Therefore, from time to time we suggest the consecutive running of a dcbf Purge followed by a fixmpos.

omnidbutil -fixmpos requires exclusive access to the IDB, therefore the consecutive running of

these commands must be done when no backups are in progress.

Example of messages seen at the command line

omnidbutil -purge -dcbf

DONE!

omnidbutil -fixmpos

DONE!

Note:-

See Appendix D for information about another manual purge that may, in

some circumstances, be required.

Appendix A

What does “Requires exclusive access to the IDB” mean?

The following three commands mentioned in this document require exclusive access to the IDB

•omnidbutil -purge -filenames -force

•omnidbutil -fixmpos

•omnidbutil -purge_failed_copies

To run any of these commands, DP must not be busy doing backups or other activities.

Close all DP GUIs and confirm that no backups, restores or other DP activities are in progress by

checking that ”omnistat“ returns “No currently running session.”

Note:

Exclusive access does not mean that the DP processes must be stopped. But

occasionally it will be necessary to stop and restart them before the

preceding commands can run.

When doing this, it is good practice after stopping DP (omnisv -stop) to look for any remaining DP

processes that may be running and close them before restarting DP (omnisv -start)

On HP-UX proceed as follows:

•Close all DP GUIs

•Make sure DP is not active, omnistat returns ”No currently running sessions”

•Stop DP processes with omnisv -stop

•ps -ef | grep omni

•kill any omni processes

•Start DP with omnisv -start

On Windows proceed as follows:

•Close all DP GUIs

•Make sure DP is not active, omnistat returns ”No currently running sessions”

•Stop DP services with omnisv -stop

•Open Task Manager and go to the Processes tab

•Highlight Data Protector process and “End Process” them

Common DP processes are bsm.exe, bma.exe, Manager.exe, dbsm.exe.

•Start DP with omnisv -start

Note:

If DP is running within Microsoft Cluster Services (MCSC) or

MC/ServiceGuard then “omnisv –stop” and “omnisv –start” may not be the

appropriate way to stop and start DP.

While a command that requires exclusive access to the IDB is running, scheduled DP backups will not start.

If the Cell Manager where you want to run the command requiring exclusive access to the IDB is part

of a Manager of Managers (MoM) you have to stop backups on all Cell Managers that are part of

the MoM.

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