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1 1 Extending Virtualized Oracle RAC Across Data Centers: True Active-Active Availability Over Distance Sam Lucido, EMC Kannan Mani, VMware Inc.,

2 2 Agenda Customer Challenges What is Oracle Real Application Clusters (RAC) What happens when a server fails using Oracle RAC Transparent Application Failure What is the single point of failure with Oracle RAC

3 3 Customer Challenges 1. Application and database availability Many mission critical systems demand 5 nines (99.999%) of uptime: Per year no more than 6 minutes of unplanned downtime 2. Revenue Impact of unplanned downtime Independent auditing of the revenue impact related to unplanned downtime can range from 10s of thousands to millions of dollars per 24 hours of outage 3. Broad application availability availability of the entire application stack and not just the database 4. Rapid Provisioning and Greater Uptime New RAC nodes are provisioned in minutes and vsphere HA along with RAC provides greater Uptime

4 RAC Interconnect 4 What Is Oracle Real Application Cluster? Real Application Clusters (RAC)Is the federation of servers to provide the following benefits: Fault Tolerance Scalability Manageability Rolling Upgrades Most customers use Oracle RAC for fault tolerance and scalability SAN Network Physical RAC Nodes Database Listener Database Listener Database Listener 10 GbE Switch SAN Storage Array

5 RAC Interconnect 5 Stretched Oracle RAC Recovery Types If A Server Fails.. A service called, Clusterware reports a change in clusters membership pool In-flight transactions are restarted on surviving nodes Database scalability and performance could temporarily be reduced do to the loss of a server in the cluster Recovery involves reconfiguring the RAC node back into the cluster SAN Network Physical RAC Nodes Database Listener Database Listener Database Listener 10 GbE Switch b

6 RAC Interconnect 6 Stretched Oracle RAC and Fault Tolerance Oracle RAC Increases Uptime Each node in a RAC grid actively services database sessions Transparent Application Failover (TAF) is an Oracle Call Interface (OCI) that provides these failover types: SELECT: recovery of an database transaction to a surviving node SESSION: failover of a session to a surviving node While TAF can recover or failover there might be an associated delay Applications must be designed to use the OCI API to use TAF Physical RAC Nodes Database Listener Database Listener Database Listener SAN Network 10 GbE Switch SAN Storage Array

7 RAC Interconnect 7 Stretched Oracle RAC: Redundancy At Most Every Layer Layer of redundancy: Physical Federation of servers into RAC nodes Use of NIC bonding and teaming Software Duplication of RAC services across all nodes What is the Single Point of Failure? However unlikely a storage array failure represents a total application outage *Exception: ASM stretch mirroring Physical RAC Nodes 10 GbE Switch SAN Network NIC NIC NIC NIC NIC NIC SAN Storage Array

8 8 How Does EMC VPLEX Address These Challenges? A Hardware And Software Solution Both within and between datacenters Even across two physically separate sites Simplify Oracle RAC deployment Solution is transparent to RAC and other applications Turn off ASM protection, keep voting disk on virtual volume Certified by Oracle EMC worked with Oracle to certify this mutual solution Enables Dynamic Workload Availability Active / Active database and application access across datacenters With virtualization the capability to non-disruptively move virtual machines

9 9 The Oracle Voting Disk Oracle RAC Voting Disk on VPLEX

10 10 EMC VPLEX Stretched Oracle RAC Metro Resiliency With Synchronous Access Anywhere Oracle RAC manages nodes across interconnect Site A LAN Backbone RAC Interconnect LAN Backbone Site B Virtual volume is synchronously replicated over VPLEX interconnect VPLEX Witness provides failure resiliency via storage monitoring Is a required component for extended Oracle RAC on VPLEX Same Virtual Volume VPLEX Interconnect VPLEX Witness 3rd Domain

11 11 Stretched Oracle RAC Without EMC VPLEX Third site for voting disk using NFS or iscsi Prevents splitbrain syndrome A Voting Disk is a shared disk device or file used to determine node availability (establishes quorum) and resolve split-brain scenarios: All nodes write to the voting disk (check in) Must be stored in a raw partition or regular file in a clustered file system like ASM Site A LAN Backbone RAC Interconnect LAN Backbone Site B

12 12 Stretched Oracle RAC With EMC VPLEX With VPLEX place the voting disk on the virtual volume VPLEX Witness prevents split brain syndrome Simplified Database Architecture Site A LAN Backbone RAC Interconnect Same Virtual Volume VPLEX Interconnect LAN Backbone Site B VPLEX Witness

13 Oracle Voting Disks: Recommendations Copyright 2012 EMC Corporation. All rights reserved. 13 Oracle Clusterware voting disks with VPLEX Witness Required Should reside on VPLEX virtual volumes and not in an independent 3 rd domain VPLEX Witness provides split-brain protection Oracle Clusterware deployment Create a unique disk group for Oracle Clusterware files (+GRID) The +GRID disk group will benefit from using Normal or High redundancy Relatively small if no other database files All other Oracle files Use external redundancy (array based RAID) as this should be adequate protection for ASM members

14 14 VMware Virtualization Oracle RAC On VPLEX

15 Oracle Real Applications Clusters (RAC) VMware VMs 15

16 Oracle RAC on vsphere Deployment Process Chart Oracle RAC Deployment Process on VMware vsphere - VMFS Create Oracle RAC Virtual Machine Install and Configure VMware ESXi 5.0 Configure NTP client, Storage and Networking on all ESX servers Add VMFS VMDK OS and Oracle Binary Create First Oracle RAC VM (VMORARAC1) Add two NIC Public and Interconnect and set to VMXNET3 Configure NTP Service on GOS Install GOS, VMware Tools and configure Device Persistent Install Oracle Grid Infrastructure NOW Save the VMORARAC1 VM as Template Change Host Name and assign new IP address Create Three Nodes Clone from Template Add Shared Disks following VMware KB Change SCSI type to Paravirtual. Add and configure CRS/ Voting Disks and format disks using fdisk Install and Configure Oracle Grid Infrastructure Verify Grid Infrastructure Run Cluster commands Install Oracle RAC Create and Add DAT, REDO VMDKs Disks to all RAC VMs. Change SCSI type to Paravirtual Format added VMDK s using fdisk on Node 1 Create ASM Disk groups for DATA and REDO Install Oracle RAC Binares Create RAC Database Complete Oracle RAC Deployment on VMware Create Custom Oracle RAC Database 16

17 RAC Node on vsphere Features vmotion for Maintenance 17

18 RAC Node on vsphere After Maintenance 18

19 Benefits of Oracle Databases on VMware Performance Server Consolidation I/O is not an issue Scale up and out Fully utilize hardware Maintain application isolation Rapid Provisioning Workload Management High Availability Business Continuity Streamline activation, deployment, and validation of servers Avoid manual configuration errors Zero downtime maintenance Migrate live databases vmotion, HA, DRS Without clustering or RAC vcenter Site Recovery Manager Hardware reduction at failover site

20 20 Oracle Redo Log Latency Oracle RAC On VPLEX

21 21 Oracle Database: Writing to the Redo Logs Database Transactions Database Write Acknowledgement LGWR (Log writer) ARCn (Archive writer) Online Redo Logs Database: Log writer latency The Oracle database will not commit transaction (insert, update or delete) until write acknowledgement has been received from the online redo logs Archive logfile Archive logfile Archive logfile

22 22 Oracle Online Redo Log Latency Database Transactions LOCAL Storage REMOTE Storage Database Write Acknowledgement LGWR (Log writer) Online Redo Logs EMC VPLEX Metro *Redo log write latency = longest amount of time it takes to acknowledge a write in remote storage

23 23 Round Trip Time The Differentiators Ideal For Oracle Stretch RAC 1 2ms Round trip time (RTT) All EMC proven solutions use a network latency of 2ms or less 3ms Round trip time (RTT) Possible For Databases With Low Transactional volume 4-5ms Round trip time (RTT) The recommendation for VPLEX Metro is no more than 5ms RTT latency over the wide area network. VPLEX Metro is certified for 5ms RTT with Extended Oracle RAC.

24 Transaction Rate Copyright 2012 EMC Corporation. All rights reserved. 24 VPLEX Metro With Stretched Oracle RAC Number of RAC Nodes Distance: 0 km (baseline) Distance: 100 km (1ms RTT) Tests Overview OLTP workload 70% reads / 30% writes 2 RAC nodes local 2 RAC nodes remote VPLEX and RAC interconnect affected by distance Increase workload with added nodes (16, 32, 48 & 64 drivers) *EMC VPLEX Metro is RAC Certified

25 25 Importance Of Write Order Fidelity Consistency Groups Write order fidelity and deterministic I/O continuation All database LUNs (ie, Oracle data, control and log files) require preserving write-order fidelity to maintain data integrity, and therefore should always be placed in a single consistency group together

26 26 VPLEX Resiliency Oracle RAC On VPLEX

27 27 Failure Scenarios: VPLEX Resiliency Solution Physical RAC Virtual RAC Physical Single Instance Virtual Single Instance Loss of a server (unplanned) TAF Manual restart or automated if using HA Dependent on Boot File System replication Manual restart or automated if using HA Loss of a server (planned) Manual restart at surviving site Live Migration Dependent on Boot File System replication Live Migration Loss of VPLEX Witness IO continues and Witness transparently rejoins Loss of storage array TAF TAF + Cold Migration or automated if using HA Dependent on Boot File System replication Manual restart or automated if using HA No loss of database access in these scenarios. Possible impact on scalability and performance until system or storage recovery.

28 28 Oracle Support For VPLEX On Linux

29 29 Oracle Support for VPLEX on Unix

30 RAC on vsphere - History Milestones Oracle support statement extension Fall 2010 MyOracleSupport.com Note » For Oracle RAC, Oracle will only accept Service Requests as described in this note on Oracle RAC and later releases. Release of the Oracle Databases on VMware - RAC Deployment Guide Jan Copyright 2012 EMC Corporation. All rights reserved. 30

31 31 EMC Proven Solutions For Oracle Oracle Runs Faster And More Efficiently On EMC and VMware Transformation Cloud Up to 3X Performance at Less Cost 40% More Oracle CPU Per Server Tested, Proven Results 80% Faster Provisioning Backup With 30x Less Storage Replicate And Recover In Minutes

32 Find EMC Experts, Tradeshows and learn more about virtualizing Oracle Copyright 2012 EMC Corporation. All rights reserved. 32 Visit Online Oracle at EMC Community Blogs, Polls, Events and Videos: One place for all EMC Oracle solutions! Search here! Participate in our discussions

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