Oracle 11gR2 RAC_GI New Feature

8/2/2019 Oracle 11gR2 RAC_GI New Feature

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11gR2 RAC/GI New Features

Gász Róbert

WEBváltó Kft.




Oracle Grid Infrastructure

• ASM and Oracle Clusterware are installed into a singlehome directory called Oracle Grid Infrastructure 11g

Release 2.• This directory is referred to as the Grid Infrastructure

home.




What Is a Cluster?

• A group of independent, but interconnected, computersthat act as a single system

• Usually deployed toincrease availability andperformance orto balance a dynamically

changing workload

Storage Network

Interconnect

Users

Network




What Is Clusterware?

Software that provides various interfaces and services for acluster. Typically, this includes capabilities that:

• Allow the cluster to be managed as a whole

• Protect the integrity of the cluster

• Maintain a registry of resources across the cluster

• Deal with changes to the cluster• Provide a common view of resources




Oracle Clusterware

Oracle Clusterware is:

• A key part of Oracle Grid Infrastructure

• Integrated with OracleAutomatic StorageManagement (ASM)

• The basis for ASM ClusterFile System (ACFS)

• A foundation for OracleReal Application Clusters

(RAC)• A generalized cluster

infrastructure for all kindsof applications




Oracle Clusterware Architecture and Services

• Shared disk cluster architecture supporting applicationload balancing and failover

• Services include: – Cluster management

– Node monitoring

– Event services

– Time synchronization

– Network management

– High availability




• Oracle Clusterware is started by the OS init daemon.

• Oracle Clusterware installation modifies the

/etc/inittab file to restart ohasd in the event of acrash.

Oracle Clusterware Startup

/etc/init.d/init.ohasd

ohasd.bin oclskd.bin

octssd.bin crsd.binoraagent.bin gipcd.bin

diskmon.bin mdnsd.bin

ocssd.bin gpnpd.bin

evmd.bin scriptagent.bin

cssdagent oraagent.binorarootagent.bin

init

Clusterwarestartup script

Oracle Clusterware processesOperating systeminit daemon

# cat /etc/inittab..h1:35:respawn:/etc/init.d/init.ohasd run >/dev/null 2>&1 </dev/null




Oracle Clusterware Process Architecture

Clusterware processes are organized into several component groups.They include:

Component Processes Owner

Cluster Ready Service (CRS) crsd root

Cluster Synchronization Service (CSS) ocssd,cssdmonitor, grid owner,cssdagent root, root

Event Manager (EVM) evmd, evmlogger grid owner

Cluster Time Synchronization Service(CTSS)

octssd root

Oracle Notification Service (ONS) ons, eons grid owner

Oracle Agent oraagent grid owner

Oracle Root Agent orarootagent root

Grid Naming Service (GNS) gnsd root

Grid Plug and Play (GPnP) gpnpd grid owner

Multicast domain name service (mDNS) mdnsd grid owner




Single Client Access Name

• The single client access name (SCAN) is the address usedby clients connecting to the cluster.

• The SCAN is a fully qualified host name located in the GNS

subdomain registered to three IP addresses.

• The SCAN provides a stable, highly available name forclients to use, independent of the nodes that make up the

cluster.

# dig @192.0.2.155 cluster01-scan.cluster01.example.com

...

;; QUESTION SECTION:

;cluster01-scan.cluster01.example.com. IN A

;; ANSWER SECTION:cluster01-scan.cluster01.example.com. 120 IN A 192.0.2.244

cluster01-scan.cluster01.example.com. 120 IN A 192.0.2.246

cluster01-scan.cluster01.example.com. 120 IN A 192.0.2.245

;; AUTHORITY SECTION:

cluster01.example.com. 10800 IN A 192.0.2.155

;; SERVER: 192.0.2.155#53(192.0.2.155)




Connection Examples

ERP=(DESCRIPTION= ## Using VIPs ## (LOAD_BALANCE=on)

(ADDRESS=(PROTOCOL=TCP)(HOST=node1-vip)(PORT=1521))



(CONNECT_DATA=(SERVICE_NAME=ERP)))

url="jdbc:oracle:oci:@ERP" ## Thick JDBC ##

url="jdbc:oracle:thin:@cluster01-scan:1521/ERP" ## Thin JDBC ##

ERP=(DESCRIPTION= ## Using the SCAN ## (LOAD_BALANCE=on)

(ADDRESS=(PROTOCOL=TCP)(HOST=cluster01-scan)(PORT=1521))


ERP=(DESCRIPTION= ## Using VIPs ## (LOAD_BALANCE=on)





ERP=(DESCRIPTION= ## Using the SCAN ## (LOAD_BALANCE=on)

(ADDRESS=(PROTOCOL=TCP)(HOST=cluster01-scan)(PORT=1521))





How GPnP Works: Client Database Connections

Database client

DNS

SCAN

listener

Listener1

Listener2

Listener3 SCAN listener

SCAN listener

GNS




ASM for OCR and Vote




ASM Configuration Assistant




ADVM: ASM Dynamic Volume Manager




ACFS: ASM Cluster File System




Cluster Resource Status

[oracle@rac11gr2node2 ~]$ crsctl stat res -t--------------------------------------------------------------------------------

NAME TARGET STATE SERVER STATE_DETAILS

--------------------------------------------------------------------------------

Local Resources

--------------------------------------------------------------------------------

ora.DATA.dg

ONLINE ONLINE rac11gr2node1


ora.LISTENER.lsnr



ora.OCRVOTE.dg



ora.asm

ONLINE ONLINE rac11gr2node1 Started


ora.eons

ONLINE ONLINE rac11gr2node1ONLINE ONLINE rac11gr2node2

ora.gsd

OFFLINE OFFLINE rac11gr2node1

OFFLINE OFFLINE rac11gr2node2

...




Questions and Answers

Thank you for listening!

Gász Róbert

WEBváltó Kft.

Date post:	06-Apr-2018
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Oracle 11gR2 RAC_GI New Feature

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