8/17/2019 Rac r2 Sem 06 Crs Jfv2

1/15

6Copyright © 2006, Oracle. All rights reserved.

Oracle Clusterware

8/17/2019 Rac r2 Sem 06 Crs Jfv2

2/15

Copyright © 2006, Oracle. All rights reserved.6 - 2

Objectives

After completing this lesson, you should be able to

describe:

• CRS resources

• RAC resources

• Virtual ! addresses and RAC

• OCR architecture

• CRS framewor"

• Cluster Verify

8/17/2019 Rac r2 Sem 06 Crs Jfv2

3/15

Copyright © 2006, Oracle. All rights reserved.6 - 3

Oracle Clusterware: Overview

• !ortable cluster infrastructure that provides high

availability to RAC databases and#or other applications:

 – $onitor applications% health

 – Restart applications on failure

 – Can fail over applications on node failure

Oracle Clusterware

system files

ORAC&'()O$'

ORA(CRS()O$'

ORAC&'()O$'

ORA(CRS()O$' ORA(CRS()O$'

&istener 

RAC *+ nst

!rotected App A

&istener 

RAC *+ nst

!rotected App +

8/17/2019 Rac r2 Sem 06 Crs Jfv2

4/15

Copyright © 2006, Oracle. All rights reserved.6 - 4

CRS Resources

• A resource is a CRSmanaged application-

• Application profile attributes are stored in OCR:

 – Chec" interval

 – .ailure policies

• An action script must do a:

 – Start of the application

 – Stop of the application

 – Chec" of the application

• &ife cycle of a resource:

crs(profile crs(register   crs(start crs(stat

crs(relocate crs(stop crs(unregister 

 – Action script

 – !rivileges

 – *ependencies

 – /

8/17/2019 Rac r2 Sem 06 Crs Jfv2

5/15

Copyright © 2006, Oracle. All rights reserved.6 - 6

RAC Resources

$ $CRS_HOME/crs_stat -t Name Type Target State Host----------------------------------------------------------------ora.atlhp8.ASM1.asm applcato! ON"#NE ON"#NE atlhp8ora.atlhp8."#STENER_AT"H8.ls!r applcato! ON"#NE ON"#NE atlhp8ora.atlhp8.gs% applcato! ON"#NE ON"#NE atlhp8ora.atlhp8.o!s applcato! ON"#NE ON"#NE atlhp8ora.atlhp8.&p applcato! ON"#NE ON"#NE atlhp8ora.atlhp'.ASM(.asm applcato! ON"#NE ON"#NE atlhp'ora.atlhp'."#STENER_AT"H'.ls!r applcato! ON"#NE ON"#NE atlhp'ora.atlhp'.gs% applcato! ON"#NE ON"#NE atlhp'ora.atlhp'.o!s applcato! ON"#NE ON"#NE atlhp'ora.atlhp'.&p applcato! ON"#NE ON"#NE atlhp'

ora.)*+E.,1.cs applcato! ON"#NE ON"#NE atlhp8ora.)*+E.,1.)*+E1.sr& applcato! ON"#NE ON"#NE atlhp8ora.)*+E.,1.)*+E(.sr& applcato! ON"#NE ON"#NE atlhp'ora.)*+E.% applcato! ON"#NE ON"#NE atlhp'ora.)*+E.)*+E1.!st applcato! ON"#NE ON"#NE atlhp8ora.)*+E.)*+E(.!st applcato! ON"#NE ON"#NE atlhp'

8/17/2019 Rac r2 Sem 06 Crs Jfv2

6/15

Copyright © 2006, Oracle. All rights reserved.6 - 7

Virtual ! Addresses and RAC

ER0ESCR#T#ON  00HOSTcl2s!o%e-1&p33  00HOSTcl2s!o%e-(&p33  0SER4#CE_NAMEER33

clnode0

ER0ESCR#T#ON  00HOSTcl2s!o%e-133  00HOSTcl2s!o%e-(33  0SER4#CE_NAMEER33

1imeout

wait

clnode2

clnode0 clnode2

2

3

4

5

clnode0vip

clnode2vip

2

clnode0vipclnode2vip

4

6

5

Clients

06

7

03

7

8/17/2019 Rac r2 Sem 06 Crs Jfv2

7/15Copyright © 2006, Oracle. All rights reserved.6 -

OCR Architecture

8ode1

OCR cache

CRS

process

Client

process

8ode2

OCR cache

CRS

process

8ode3

OCR cache

CRS

process

Client

process

OCR

primary

file

Shared

storageOCR

mirror 

file

8/17/2019 Rac r2 Sem 06 Crs Jfv2

8/15Copyright © 2006, Oracle. All rights reserved.6 - !0

Automatic OCR +ac"ups

•1he OCR content is critical to Oracle Clusterware-

• OCR is automatically bac"ed up physically:

 – 'very four hours: CRS "eeps the last three-

 – At the end of every day: CRS "eeps the last two-

 – At the end of every wee": CRS "eeps the last two-

 –

• Change the default automatic bac"up location:

$ c% $ORAC"E_5ASE/Crs/c%ata/67&_cl2s$ ls -lt-r*-r--r-- 1 root root 981(8 ,a! ' :(;

8/17/2019 Rac r2 Sem 06 Crs Jfv2

9/15Copyright © 2006, Oracle. All rights reserved.6 - !!

1hird!arty Application !rotection: Overview

• )igh availability framewor": – Commandline tools to register applications with CRS

 – Calls control application agents to manage applications

 – OCR used to describe CRS attributes for the applications

• )igh availability C A!:

 – $odify CRS attributes directly in OCR

 – $odify CRS attributes at run time

• Application V!s:

 – 9sed for applications accessed by networ" means

 –8C redundancy

 – 8C failover 

• OC.S:

 – Store application configuration files

 – Share files between cluster nodes

8/17/2019 Rac r2 Sem 06 Crs Jfv2

10/15Copyright © 2006, Oracle. All rights reserved.6 - !2

9se CRS .ramewor": Overview

0- Create an application V! if necessary:

a Create a profile: 8etwor" data ; 2sr&p predefined script

b Register the application V!-

c Set user permissions on the application V!-

d Start the application V! by using crs_start-

2-

8/17/2019 Rac r2 Sem 06 Crs Jfv2

11/15Copyright © 2006, Oracle. All rights reserved.6 - !3

9se CRS .ramewor": Overview

4- Create an application profile:

• Action script location

• Chec" interval

• .ailover policies

• Application V! if necessary

6- Set permissions on your application-

3- Register the profile with Oracle Clusterware-

7- Start your application using crs_start-

8/17/2019 Rac r2 Sem 06 Crs Jfv2

12/15Copyright © 2006, Oracle. All rights reserved.6 - !4

Cluster Verify: Overview

• 1o verify that you have a wellformed cluster for Oracle

Clusterware and RAC, chec" the:

 – nstallation

 – Configuration

 – Operation

• .ull stac" verification

• 8onintrusive verification

• *iagnostic mode see"s to establish a reason for the

failure of any verification tas"-• 'asytouse interface:

 – Stage commands

 – Component commands

8/17/2019 Rac r2 Sem 06 Crs Jfv2

13/15Copyright © 2006, Oracle. All rights reserved.6 - !"

Cluster Verify Stages

9ser sets up thehardware,

networ", = storage

Sets up OC.S

> O!1

nstalls

CRS

nstalls

RAC

Configures

RAC *+

-post h*os

-post c7s

-post crs!st

-pre crs!st

-pre %!st

-pre %c7g

-pre c7s

$ cl2&7y stage -lst

8/17/2019 Rac r2 Sem 06 Crs Jfv2

14/15Copyright © 2006, Oracle. All rights reserved.6 - !6

*emos

• Apache

• ?cloc"

http:##www-oracle-com#technology#obe#demos#admin#demos-html

8/17/2019 Rac r2 Sem 06 Crs Jfv2

15/15Copyright © 2006 Oracle All rights reserved6 !7

Summary

n this lesson, you should have learned about:

• CRS resources

• RAC resources

• Virtual ! addresses and RAC

• OCR architecture

• CRS framewor"

• Cluster Verify