Question on RAC Failover testing
Can someone point me to RAC Fail-over testing strategies?
Thanks,
Subroto
It totally depends on your application and your setup. Using TAF ? Using Load Balancing ? Using OCFS ? Using ASM ?
Kill the sqlnet listener and see what happens.
Kill the database pmon and see what happens.
Kill the ASM dbwr and see what happens.
Kill crsd and see what happens.
Shutdown the VIP interface and see what happens.
Shutdown the interconnect interface and see what happens.
Pull the power plug out and see what happens.
Similar Messages
-
Hi,
Anybody did 11i/10g RAC Failover test. How to do the test and what steps involved. What is expected when one node down?
my config
web, admin, form - appsnode1
concurrent / db (rac1) - dbnode1
concurrent /db (rac2) - dbnode2
Thanks for your help.
RegardsYou can check the below
1. VIP Failover - VIP should failover when node gets rebooted.
2. When one of the node is down you should still be able to logon to applications.
3. Since you have only one node and do not use PCP you CM processes will die.Make sure you start them.
4.Once you bring the node back , test your load balancing is happening fine across both the db nodes.
Let me know if this is helpful/correct and if you need more information.
Regards
Nitin Arora -
Node can not join cluster after RAC HA Testing
Dear forum,
We are performing RAC failover tests according to document "RAC System Test Plan Outline 11gR2, Version 2.0". In testcase #14 - Interconnect network failure (11.2.0.2 an higher), we have disabled private interconnect network of node node1 (OCR Master).
Then - as expected - node node2 was evicted. Now, after enabling private interconnect network on node node1, i want to start CRS again on node2. However, node does not join cluster with messages:
2012-03-15 14:12:35.138: [ CSSD][1113114944]clssgmWaitOnEventValue: after CmInfo State val 3, eval 1 waited 0
2012-03-15 14:12:35.371: [ CSSD][1109961024]clssnmvDHBValidateNCopy: node 1, node1, has a disk HB, but no network HB, DHB has rcfg 226493542, wrtcnt, 2301201, LATS 5535614, lastSeqNo 2301198, uniqueness 1331804892, timestamp 1331817153/13040714
2012-03-15 14:12:35.479: [ CSSD][1100884288]clssnmvDHBValidateNCopy: node 1, node1, has a disk HB, but no network HB, DHB has rcfg 226493542, wrtcnt, 2301202, LATS 5535724, lastSeqNo 2301199, uniqueness 1331804892, timestamp 1331817154/13041024
2012-03-15 14:12:35.675: [ CSSD][1080801600]clssnmvDHBValidateNCopy: node 1, node1, has a disk HB, but no network HB, DHB has rcfg 226493542, wrtcnt, 2301203, LATS 5535924, lastSeqNo 2301200, uniqueness 1331804892, timestamp 1331817154/13041364
Rebooting node2 did not help. Node1 which was online all the time (although private interconnect interface was unplugged for a few minutes and then plugged back in). I suppose that if we reboot node2, the problem will disappear. But there should be solution, which keeps availability requirements.
Setup:
2 Nodes (OEL5U7, UEK)
2 Storages
Network bonding via Linux bonding
GI 11.2.0.3.1
RDBMS 11.1.0.7.10
Any ideas?
Regards,
MartinI have found a solution myself:
[root@node1 trace]# echo -eth3 > /sys/class/net/bond1/bonding/slaves
[root@node1 trace]# echo -eth1 > /sys/class/net/bond1/bonding/slaves
[root@node1 trace]# echo +eth1 > /sys/class/net/bond1/bonding/slaves
[root@node1 trace]# echo +eth3 > /sys/class/net/bond1/bonding/slaves
Now node2 is automatically joining the cluster.
Regards,
martin -
JMS queue| failover test question
HI gurus,
We are planning a failover test to migrate from prod to contingency environment.
What happens to transactions that may be sitting in the JMS queue when the prod jvms are stopped? Is there a way to migrate them to the cont jvms?We are using jdbc stores and the supporting tables for both prod and cont will exist in the oracle DB, but with different names. Since the CONT jvms will be using different tables for the JMS queues, is there a way to migrate those queued transactions from prod to the CONT side?
Details of environment
1) OS for App Server
Linux x86-64.
Linux va2xpre03.gdsososos.com 2.6.18-128.1.6.el5 #1 SMP Tue Mar 24 12:05:57 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux
2) App Server type and version
WLS 10.3.0
JDK version
jrockit_160_11
3)
Clustered and it is a Prod environment.
Details:
UI cluster has 5 servers. There are 4 jvms in each server. Altogether there are 20 jvms in UI cluster
Recon cluster has 3 servers. There are 4 jvms in each server. Altogether there are 12 jvms in Recon cluster
regards,
Thiago Leoncio GuimaraesA common practice for handling this type of fail-over is to ensure that the main environment's domain name, server names, store, transaction logs (default store), and JMS configuration all all the same in the contigency environment (basically, differences, if any, are confined to things like URLs and Data Source configuration of DB location). Recovery is accomplished in the fail-over environment by copying over each server's default file store, as well as its JDBC store backing tables, prior to booting the fail-over servers.
Transaction logs don't need to be copied over if you don't use XA (JTA) in your applications... -
Good day all,
I have a question about the N+1 5508 failover test:
Should I shutdown one of the primary WLC to test failover?
I just setup the N+1 bakcup WLC (5508). B
Based on: http://www.cisco.com/en/US/docs/wireless/technology/hi_avail/N1_High_Availability_Deployment_Guide.pdf
We have two production WLCs both 5508 and one 4405.
We just purchased another HA-SKU WLC 5508.
All our four WLCs had been setup into one mobility group in version 7.4.100.6.
Their neighbors are all up.
But our test AP could not register to the Backup N+1 WLC. ( We are using option 43 in our DHCP server for all the AP boot.)
Here are the log screen:
================ From test Access Point============
*Mar 1 00:00:53.099: %CDP_PD-4-POWER_OK: Full power - INJECTOR_CONFIGURED_ON_SOURCE inline power source
*Mar 1 00:00:53.842: %DHCP-6-ADDRESS_ASSIGN: Interface BVI1 assigned DHCP address 10.255.1.3, mask 255.255.255.0, hostname wo11-test-ap1
*Mar 1 00:00:54.188: %LINK-6-UPDOWN: Interface Dot11Radio0, changed state to up
*Mar 1 00:00:55.188: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to up
*Mar 1 00:00:55.279: %LINK-6-UPDOWN: Interface Dot11Radio1, changed state to up
*Mar 1 00:00:56.280: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio1, changed state to up
*Mar 1 00:01:03.820: %CAPWAP-5-DHCP_OPTION_43: Controller address 10.254.240.5 obtained through DHCP
*Mar 1 00:01:03.820: %CAPWAP-3-ERRORLOG: Did not get log server settings from DHCP.
*Mar 1 00:01:13.823: %CAPWAP-3-ERRORLOG: Go join a capwap controller
*Aug 2 02:30:55.000: %CAPWAP-5-DTLSREQSEND: DTLS connection request sent peer_ip: 10.254.240.5 peer_port: 5246
*Aug 2 02:31:25.003: DTLS_CLIENT_ERROR: ../capwap/base_capwap/dtls/base_capwap_dtls_connection_db.c:2051 Max retransmission count reached!
*Aug 2 02:31:55.001: %DTLS-5-SEND_ALERT: Send FATAL : Close notify Alert to 10.254.240.5:5246
*Aug 2 02:31:55.001: %CAPWAP-3-ERRORLOG: Go join a capwap controller
*Aug 2 02:30:55.000: %CAPWAP-5-DTLSREQSEND: DTLS connection request sent peer_ip: 10.254.240.23 peer_port: 5246
*Aug 2 02:30:55.490: %CAPWAP-5-DTLSREQSUCC: DTLS connection created sucessfully peer_ip: 10.254.240.23 peer_port: 5246
*Aug 2 02:30:55.493: %CAPWAP-5-SENDJOIN: sending Join Request to 10.254.240.23
*Aug 2 02:30:55.493: %CAPWAP-3-ERRORLOG: Invalid event 10 & state 5 combination.
*Aug 2 02:30:55.493: %CAPWAP-3-ERRORLOG: CAPWAP SM handler: Failed to process message type 10 state 5.
*Aug 2 02:30:55.493: %CAPWAP-3-ERRORLOG: Failed to handle capwap control message from controller
*Aug 2 02:30:55.493: %CAPWAP-3-ERRORLOG: Failed to process encrypted capwap packet from 10.254.240.23
*Aug 2 02:30:55.874: %LINK-6-UPDOWN: Interface Dot11Radio0, changed state to down
*Aug 2 02:30:55.931: %LINK-5-CHANGED: Interface Dot11Radio0, changed state to reset
*Aug 2 02:30:55.987: %CAPWAP-5-JOINEDCONTROLLER: AP has joined controller WG-WLC1
*Aug 2 02:30:56.041: ac_first_hop_mac - IP:10.255.1.1 Hop IP:10.255.1.1 IDB:BVI1
*Aug 2 02:30:56.041: Setting AC first hop MAC: ccef.481f.14bf
-test-ap1#sh int bvI 1
BVI1 is up, line protocol is up
Hardware is BVI, address is e8b7.489e.4645 (bia e8b7.489e.4645)
Internet address is 10.255.1.3/24
===================From backup N+1 WLC===
*spamApTask4: Aug 02 11:41:09.842: #CAPWAP-3-DTLS_DB_ERR: capwap_ac_sm.c:7305 64:a0:e7:40:eb:42: Failed to create DTLS connection for AP 10:255:1:3 (58470).
*spamApTask4: Aug 02 11:41:01.889: #CAPWAP-3-DTLS_DB_ERR: capwap_ac_sm.c:7305 64:a0:e7:40:eb:42: Failed to create DTLS connection for AP 10:255:1:3 (58470).
*spamApTask4: Aug 02 11:40:57.912: #CAPWAP-3-DTLS_DB_ERR: capwap_ac_sm.c:7305 64:a0:e7:40:eb:42: Failed to create DTLS connection for AP 10:255:1:3 (58470).
*spamApTask4: Aug 02 11:40:55.924: #CAPWAP-3-DTLS_DB_ERR: capwap_ac_sm.c:7305 64:a0:e7:40:eb:42: Failed to create DTLS connection for AP 10:255:1:3 (58470).
*spamApTask4: Aug 02 11:18:50.553: #CAPWAP-3-DTLS_DB_ERR: capwap_ac_sm.c:7305 64:a0:e7:40:eb:42: Failed to create DTLS connection for AP 10:255:1:3 (58469).
*spamApTask4: Aug 02 11:18:42.600: #CAPWAP-3-DTLS_DB_ERR: capwap_ac_sm.c:7305 64:a0:e7:40:eb:42: Failed to create DTLS connection for AP 10:255:1:3 (58469).
*spamApTask4: Aug 02 11:18:38.623: #CAPWAP-3-DTLS_DB_ERR: capwap_ac_sm.c:7305 64:a0:e7:40:eb:42: Failed to create DTLS connection for AP 10:255:1:3 (58469).
*spamApTask4: Aug 02 11:18:36.636: #CAPWAP-3-DTLS_DB_ERR: capwap_ac_sm.c:7305 64:a0:e7:40:eb:42: Failed to create DTLS connection for AP 10:255:1:3 (58469).
*mmListen: Aug 02 10:43:38.637: #LOG-3-Q_IND: spam_lrad.c:1676 Ignoring discovery request from AP e8:b7:48:9e:46:45 - maximum number of downloads (0) exceeded
*spamApTask0: Aug 02 10:43:38.500: #LWAPP-3-DISC_MAX_DOWNLOAD: spam_lrad.c:1676 Ignoring discovery request from AP e8:b7:48:9e:46:45 - maximum number of downloads (0) exceeded
==================== From one of our Primary WLC=====================
(WLC-5500) >show advanced backup-controller
AP primary Backup Controller .................... ODC-WLC1 10.254.240.5
AP secondary Backup Controller .................. 0.0.0.0
(WLC-5500) >show redundancy summary
Redundancy Mode = SSO DISABLED
Local State = ACTIVE
Peer State = N/A
Unit = Primary
Unit ID = 54:75:D0:DE:DE:40
Redundancy State = N/A
Mobility MAC = 54:75:D0:DE:DE:40
Redundancy Management IP Address................. 0.0.0.0
Peer Redundancy Management IP Address............ 0.0.0.0
Redundancy Port IP Address....................... 0.0.0.0
Peer Redundancy Port IP Address.................. 169.254.0.0
(WLC-5500) >show license capacity
Licensed Feature Max Count Current Count Remaining Count
AP Count 250 203 47
==============From the Backup N+1 WLC in DR =====================
(Cisco Controller) >show redundancy summary
Redundancy Mode = SSO DISABLED
Local State = ACTIVE
Peer State = N/A
Unit = Secondary - HA SKU
Unit ID = 6C:41:6A:5F:4C:80
Redundancy State = N/A
Mobility MAC = 6C:41:6A:5F:4C:80
Redundancy Management IP Address................. 10.254.240.3
Peer Redundancy Management IP Address............ 0.0.0.0
Redundancy Port IP Address....................... 169.254.240.3
Peer Redundancy Port IP Address.................. 169.254.0.0
(Cisco Controller) >show license capacity
Licensed Feature Max Count Current Count Remaining Count
AP Count 500 0 500Current AP High Availability Configuration:
2nd Step, shutdown the LAN Switch ports on which the Primary WLC is connected so I force the AP going to HA SKU WLC.
DC-WiFi-SVC1-LAB(config)#inter
DC-WiFi-SVC1-LAB(config)#interface por
DC-WiFi-SVC1-LAB(config)#interface port-
DC-WiFi-SVC1-LAB(config)#interface port-channel 3
DC-WiFi-SVC1-LAB(config-if)#shut
DC-WiFi-SVC1-LAB(config-if)#
Log in the AP after shutdown:
Jan 15 15:52:15.307: %CAPWAP-3-ERRORLOG: Retransmission count for packet exceeded max(CAPWAP_WTP_EVENT_REQUEST
., 2)
*Jan 15 15:52:15.307: %CAPWAP-3-ERRORLOG: Retransmission count exceeded max, ignoring as the ethernet is overloaded
*Jan 15 15:52:18.307: %CAPWAP-3-ERRORLOG: Retransmission count for packet exceeded max(CAPWAP_WTP_EVENT_REQUEST
., 2)
*Jan 15 15:52:18.307: %CAPWAP-3-ERRORLOG: Retransmission count exceeded max, ignoring as the ethernet is overloaded
*Jan 15 15:52:21.307: %CAPWAP-3-ERRORLOG: Retransmission count for packet exceeded max(CAPWAP_WTP_EVENT_REQUEST
., 3)
*Jan 15 15:52:21.307: %CAPWAP-3-ERRORLOG: Retransmission count exceeded max, ignoring as the ethernet is overloaded
*Jan 15 15:52:24.307: %CAPWAP-3-ERRORLOG: Retransmission count for packet exceeded max(CAPWAP_WTP_EVENT_REQUEST
., 4)
*Jan 15 15:52:24.307: %CAPWAP-3-ERRORLOG: Retransmission count exceeded max, ignoring as the ethernet is overloaded
*Jan 15 15:52:27.307: %CAPWAP-3-ERRORLOG: Retransmission count for packet exceeded max(CAPWAP_WTP_EVENT_REQUEST
., 4)
*Jan 15 15:52:27.307: %CAPWAP-3-ERRORLOG: Retransmission count exceeded max, ignoring as the ethernet is overloaded
*Jan 15 15:52:30.307: %CAPWAP-3-ERRORLOG: Retransmission count for packet exceeded max(CAPWAP_WTP_EVENT_REQUEST
., 4)
*Jan 15 15:52:30.307: %CAPWAP-3-ERRORLOG: Retransmission count exceeded max, ignoring as the ethernet is overloaded
*Jan 15 15:52:33.307: %CAPWAP-3-ERRORLOG: Retransmission count for packet exceeded max(CAPWAP_WTP_EVENT_REQUEST
., 4)
*Jan 15 15:52:33.307: %CAPWAP-3-ERRORLOG: Retransmission count exceeded max, ignoring as the ethernet is overloaded
*Jan 15 15:52:36.307: %CAPWAP-3-ERRORLOG: Retransmission count for packet exceeded max(CAPWAP_WTP_EVENT_REQUEST
., 4)
*Jan 15 15:52:36.307: %CAPWAP-3-ERRORLOG: Retransmission count exceeded max, ignoring as the ethernet is overloaded
*Jan 15 15:52:39.307: %CAPWAP-3-ERRORLOG: Retransmission count for packet exceeded max(CAPWAP_WTP_EVENT_REQUEST
., 4)
*Jan 15 15:52:39.307: %CAPWAP-3-ERRORLOG: Retransmission count exceeded max, ignoring as the ethernet is overloaded
*Jan 15 15:52:42.307: %CAPWAP-3-ERRORLOG: Retransmission count for packet exceeded max(CAPWAP_WTP_EVENT_REQUEST
., 7)
*Jan 15 15:52:42.307: %CAPWAP-3-ERRORLOG: Retransmission count exceeded max, ignoring as the ethernet is overloaded
*Jan 15 15:52:45.307: %CAPWAP-3-ERRORLOG: Retransmission count for packet exceeded max(CAPWAP_WTP_EVENT_REQUEST
., 8)
*Jan 15 15:52:45.307: %CAPWAP-3-ERRORLOG: GOING BACK TO DISCOVER MODE
*Jan 15 15:52:45.307: %DTLS-5-SEND_ALERT: Send FATAL : Close notify Alert to 172.23.111.23:5246
*Jan 15 15:52:45.371: %WIDS-6-DISABLED: IDS Signature is removed and disabled.
*Jan 15 15:52:45.371: %LWAPP-3-CLIENTERRORLOG: LWAPP LED Init: incorrect led state 255
*Jan 15 15:52:45.383: %LINK-5-CHANGED: Interface Dot11Radio0, changed state to administratively down
*Jan 15 15:52:45.383: %LINK-5-CHANGED: Interface Dot11Radio1, changed state to administratively down
*Jan 15 15:52:45.395: %LINK-6-UPDOWN: Interface Dot11Radio0, changed state to up
*Jan 15 15:52:46.015: %LINK-6-UPDOWN: Interface Dot11Radio1, changed state to up
*Jan 15 15:52:46.383: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to down
*Jan 15 15:52:46.423: %LINK-6-UPDOWN: Interface Dot11Radio1, changed state to down
*Jan 15 15:52:46.431: %LINK-5-CHANGED: Interface Dot11Radio1, changed state to reset
*Jan 15 15:52:47.167: %CLEANAIR-6-STATE: Slot 0 down
*Jan 15 15:52:47.167: %CLEANAIR-6-STATE: Slot 1 down
*Jan 15 15:52:47.415: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to up
*Jan 15 15:52:47.423: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio1, changed state to down
*Jan 15 15:52:47.451: %LINK-6-UPDOWN: Interface Dot11Radio1, changed state to up
*Jan 15 15:52:47.459: %LINK-6-UPDOWN: Interface Dot11Radio0, changed state to down
*Jan 15 15:52:47.467: %LINK-5-CHANGED: Interface Dot11Radio0, changed state to reset
*Jan 15 15:52:48.451: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio1, changed state to up
*Jan 15 15:52:48.459: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to down
*Jan 15 15:52:48.487: %LINK-6-UPDOWN: Interface Dot11Radio0, changed state to up
*Jan 15 15:52:49.487: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to up
*Jan 15 15:52:56.011: %CAPWAP-3-ERRORLOG: Selected MWAR 'DC-WiFi-WLC1-0'(index 1).
*Jan 15 15:52:56.011: %CAPWAP-3-ERRORLOG: Go join a capwap controller
*Jan 15 15:52:44.000: %CAPWAP-5-DTLSREQSEND: DTLS connection request sent peer_ip: 172.23.111.20 peer_port: 5246
*Jan 15 15:52:44.467: %CAPWAP-5-DTLSREQSUCC: DTLS connection created sucessfully peer_ip: 172.23.111.20 peer_port: 5246
*Jan 15 15:52:44.471: %CAPWAP-5-SENDJOIN: sending Join Request to 172.23.111.20
*Jan 15 15:52:44.471: %CAPWAP-3-ERRORLOG: Invalid event 10 & state 5 combination.
*Jan 15 15:52:44.471: %CAPWAP-3-ERRORLOG: CAPWAP SM handler: Failed to process message type 10 state 5.
*Jan 15 15:52:44.471: %CAPWAP-3-ERRORLOG: Failed to handle capwap control message from controller
*Jan 15 15:52:44.471: %CAPWAP-3-ERRORLOG: Failed to process encrypted capwap packet from 172.23.111.20
*Jan 15 15:52:44.927: %LINK-6-UPDOWN: Interface Dot11Radio0, changed state to down
*Jan 15 15:52:44.995: %LINK-5-CHANGED: Interface Dot11Radio0, changed state to reset
*Jan 15 15:52:45.003: ac_first_hop_mac - IP:10.219.96.1 Hop IP:10.219.96.1 IDB:BVI1
*Jan 15 15:52:45.007: %LINK-6-UPDOWN: Interface Dot11Radio0, changed state to up
*Jan 15 15:52:45.075: %CAPWAP-5-JOINEDCONTROLLER: AP has joined controller DC-WiFi-WLC1-0
*Jan 15 15:52:45.223: %WIDS-6-ENABLED: IDS Signature is loaded and enabled
*Jan 15 15:52:45.927: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to down
*Jan 15 15:52:45.971: %LINK-6-UPDOWN: Interface Dot11Radio1, changed state to down
*Jan 15 15:52:45.979: %LINK-5-CHANGED: Interface Dot11Radio1, changed state to reset
*Jan 15 15:52:46.007: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio1, changed state to down
*Jan 15 15:52:46.959: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to up
*Jan 15 15:52:46.999: %DOT11-6-DFS_SCAN_START: DFS: Scanning frequency 5520 MHz for 60 seconds.
*Jan 15 15:52:47.003: %LINK-6-UPDOWN: Interface Dot11Radio1, changed state to up
*Jan 15 15:52:47.015: %LINK-6-UPDOWN: Interface Dot11Radio0, changed state to down
*Jan 15 15:52:47.023: %LINK-5-CHANGED: Interface Dot11Radio0, changed state to reset
*Jan 15 15:52:48.003: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio1, changed state to up
*Jan 15 15:52:48.015: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to down
*Jan 15 15:52:48.047: %LINK-6-UPDOWN: Interface Dot11Radio0, changed state to up
*Jan 15 15:52:49.047: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to up
APe4d3.f11e.a8e1#
3rd Step, verifying the LOG on the AP and check if it can connect to the HA SKU WLC
*Jan 15 15:52:45.075: %CAPWAP-5-JOINEDCONTROLLER: AP has joined controller DC-WiFi-WLC1-0
*Jan 15 15:52:45.223: %WIDS-6-ENABLED: IDS Signature is loaded and enabled
CONCLUSION:
I needed to activate the EVALUATION LICENSE in the HA SKU WLC which had status = EULA NOT ACCEPTED. I will test the SSID's in order to confirm that redundancy using HA SKU WLC works fine. -
Handling Oracle RAC Failover at the application layer
Hi All,
I am currently researching best practices for handling oracle RAC failover at the application layer since transactional statements (INSERT,UPDATE and DELETE) are not handled transparently. So I have few questions for the community:
1. In case of a node failure would I need to roll back all of transactional statements that are part of the transaction or would I have to re-execute the one that failed only?
2. Does things change with XA 2 phase commit transactions?
Any input and/or architecture suggestions would be much appreciated.
Regards,
Dmitriy FrolovHi,
the Oracle RAC stack works very vell on its own, without the need of a third party clusterware. It will be aware of failures on the nodes.
Database will be using ASM or RAW or NFS devices for Shared storage.
Oracle Clusterware can also be configured to monitor your applications and to a failover to other nodes.
However if you need a shared filesystem for your own applications, then you will have to use QFS or similar (which again than requires Sun Cluster).
See: http://www.oracle.com/technology/products/database/clusterware/index.html
Regards
Sebastian -
Hello,
Am new to Oracle RAC. We have a 2 node 11gR2 Cluster and we are in the process of doing some failover testing. For database deployments we use an internal third part tool called the deployer which has tokens for DB configurations and the DBHost token in the deployer has the Hostname for either Node 1 or Node 2. In this way we are not actually utilising the HA feature because the connection is either to Node1 or Node 2 and if something happens to either the deployment cannot connect to the database on the respective Node which treats as a single Node instead of a Cluster.
Instead of mentioning the DBHost value to point to the Physical Hostname of the Server in a Cluster I was thinking if I can use the VIP address i.e ipaddress-VIP for either of the Node. So after making changes I would like to do some failover testing manually and I am stuck here. How do I go about the testing scenarios.
For Eg: if DBHOST token value is VIP for Node 2, connections are coming in to Node2 via deployer how do I proceed with the testing
Should I bring down Node 2? If I reboot how can I see if it failed over or not to the surviving Node?
Any help/suggestions much appreciated.
Thanks!What you describe is having a RAC cluster, possibly working possibly not, and no actual use of the value of the licensing you paid for.
My first advice to you is to read the docs and learn what RAC is, how it works, how to define and use services, and how a properly configured LISTENER.ORA and TNSNAMES.ORA should be constructed so you can compare that to what you have. With 11gR2 you should connect to the SCAN not the VIP.
Here's how I would test RAC:
1. Walk up to one of the servers while half the users are connected to each instance and do a SHUTDOWN ABORT. See what happens. Restart the killed node. Try it with the other node.
2. With everything running properly and load on both machines disconnect the switch that provides the cache fusion interconnect or pull one of the cables out of the server. When you reestablish the connection what happens?
3. Repeat #2 but this time with the connection to storage.
The above should get you started. -
Do I need to change OCI layer to utilize Oracle RAC failover Feature?
Dear Oracle Experts,
From the Oracle documents, the RAC is a great feature providing the scalability and high availablility. I thought the failover features should be transparent to users.
However, from this book:
http://www.oreilly.com/catalog/oressentials2/chapter/ch01.html
"For instance, in high-availability implementations in which multiple systems share disks and implement Real Application Clusters/Oracle Parallel Server, you may want users to reattach to a second server transparently if the first fails. You can write programs that do this using OCI. "
"You can write applications with the Oracle Call Interface (OCI) to provide failover to a second instance transparently to the user. "
I am confused if RAC failover feature have to depend on OCI user application coding?
I have an application developed over Oracle 8.1.6, if I buy Oracle9i to use RAC failover feature, should I modify my application at OCI layer to make it work? Can I switch the oracle instance when the original one fails only by RAC setup instead of changing OCI code?
Thanks.
Wei
P.S. I am running application over Compaq tru64 5.1A.Hi ,
As answered by Sumit u need not alter ur application for shifting it to RAC.But there are few things which will determine the perfoemance of your application on RAC and depend on the type of application u use .Application partioning,data partitioning,index partitioning ... look for these topics . This may help.
The other thing u mentioned abt. Oracle Libraries,DB name,SID .. . Now when u'll have RAC there will be more than 1 Node I believe. So each Node will have its SID,Oracle Binaries but DB name will be same.
Gud Luck!
Vijay Shanker
Edited by: Vijay Shanker on Feb 14, 2009 6:12 PM -
can we send pre-test score (Pre-test question slide) and post test score (Question slide) both in lms from captivate?
Pretest score normally is not sent to the LMS. However it is stored in a system variable, you could use JS to send it.
-
I was reading the article about installing the RAC.
My conclussion , I can have till 127 instaces of a Oracle 10G database, working simultane. That is good really good and powerfull.
My questions
1º). ¿Can I have , by example, 3 , or any other number, of computer working with a HTMLDB instance or Oracle Aplication Server everyone serving pages to Internet and all then conect to one of those nodes? I think that yes, but prefer confirmation
2º) In case of failure of any of these nodes, broken computer ,by example, and I need to replace it, or I want add new nodes to a RAC system. ¿How I can do this? or ¿Where I can find documentation about this?
thanks for your help.Is posting Question about RAC some kind of thought experiment on clustering? Like, if you post the same question several tyimes do you get faster answers?
Cheers, APC -
I have a question takig the CLAD test wed
A Waveform Cluseter contains each of the following elements. A. t0, dt, Y B. X, Y, dt C. X, Y, t0, D. none of the above. Chose A, B , C, or D please
Thanks people for your help. I do not how tgo use labview help, b ut not to answer these sorts of questions. Also, the test does not have questions on how to use labviuew help, from the examples i have seen.
So here is another, if someone could tell me how to use help top actaully find these answers that would be great. I do not think help is setup to answer test questions
here is anotrher
All of the following statements regarding SubVIs are true except.
A. They require less memory
B. They allow for easier debugging
C They allow yopu to use the same code for many future applications
D. All of the above are true.
I say answer is B makes debugging more difficult? -
Dataguard switchover & failover testing
i want to build new physical & logical dbs just for testing & learning, as per menalink notes 736863.1 & 748595.1
wondering that configuration will let me test switchover & failover testing?Hi there,
Those notes help you to build a proper data guard configuration in both Physical and Logical Standby enviromnment.
I would also recommend to check:
- [The Oracle online documentation|http://download.oracle.com/docs/cd/B19306_01/server.102/b14239/toc.htm]
- [Oracle Maximum Availability Architecture site on OTN|http://www.oracle.com/technology/deploy/availability/htdocs/maa.htm]
These documents can provide a big picture of Data Guard configurations from different approaches as well as I would also recommend to learn and practice more advanced techniques and features such as Flasback database, Fast-start-failover or Cascaded destinations.
Hope this helps,
Good luck and regards,
Jozsef -
As part of an ISE implementation, I want to test ISE failover for Admin, MnT, and PSN personas. Does anyone have an ISE failover test plan or ISE failover test best practices documentation to share?
Thanks much,
David DaversoSteps for Administration persona failover testing
1. Stop ISE services on Primary Admin
Primary Admin# application stop ise
2. Log in to the Secondary Admin GUI and manually promote to Primary
3. Wait 10-15 minutes before process is complete
4. Verify ISE services are up on promoted Secondary Admin
Secondary Admin# sh application status ise
5. Promoted Primary Admin checks
Deployment pages shows all nodes are green and in synch
6. User testing to verify successful authentications and logging
Note:
After you promote your secondary Administration node to become the primary Administration
node, you must reconfigure your scheduled Cisco ISE backups in the newly promoted primary
Administration node
because scheduled backups are not replicated from the primary to secondary Administration
node.
7. After step 6 testing is complete restore original Primary Admin
8. Start ISE services on original Primary Admin
Primary Admin# application start ise
9. Verify ISE services are up on original Primary Admin
Primary Admin# sh application status ise
10. Promoted Primary Admin checks
Deployment pages shows original Primary Admin green and in synch
11. Stop ISE services on Promoted Primary Admin
Secondary Admin# application stop ise
12. Log in to the original Primary Admin GUI and manually promote to Primary
13. Wait 10-15 minutes before process is complete
14. Verify ISE services are up on original Primary Admin
Primary Admin# sh application status ise
15. Promoted Primary Admin checks
Deployment pages shows all nodes are green and in synch
16. User testing to verify successful authentications and logging
Note:
After you promote your secondary Administration node to become the primary Administration
node, you
must reconfigure your scheduled Cisco ISE backups in the newly promoted primary
Administration node
because scheduled backups are not replicated from the primary to secondary Administration
node.
17. Start ISE services on original Secondary Admin
Secondary Admin# application start ise
18. Verify ISE services are up on original Secondary Admin
Secondary Admin# sh application status ise
19. Primary Admin checks
Deployment pages shows original Secondary Admin green and in synch
20. User testing to verify successful authentications and logging -
My company is a relatively small enterprise (about 800 people scattered across 45-50 branches) and we are planning on setting up a periodic failover/redundancy testing schedule for our routers. Basically, we want to test the secondary WAN links at our branch offices and test our redundancy in our data centers.
I'm sure there is plenty of documentation out there in regards to best practices, but what I find has more to do with a full DR test of a enterprise's systems, as opposed to a simple failover test of an office's WAN link.
Does anyone have good suggestions for how often you should run these tests? My original thinking is to do this every quarter, but this would involve some travel for us and our resources are slim. The branch offices can be done remotely without any issue, but our DR site (which is actually used for some production traffic) would probably require one of our staff to be on site during a redundancy test.
Thanks!Yep, that's what I did now.
But keep in mind this is not really explained, even if crossing all the documentations.
There is no document explaining what behaviour to expect in Jabber in case of redundancy of all the UC components.
For the CUCM, it's not clear, and nothing is mentionned in case of MRA.
IM&P is documented, but nothing for MRA.
Expressays states about redundancy, but the behaviour to expect is not. Same for XMPP federation, no idea.
UnityConnection as well, nothing is explained. -
Recreate standby after failover test
Hi -
I'm doing a failover test for the customer:
1. Disconnect all network between Primary and Standby
2. On the Standby - do a failover and open it to perform application tests.
3. After finish we need to re-create Standby again.
Is there a way to re-create Standby again without bringing it all from backup? it's a large 2TB database and it will take hours.
Is there a way like using flashback or other technology to do it?
We are talking 10.2.0.3 here...
Thanks
Edited by: 912294 on 04:07 06/02/2012Is there a way to re-create Standby again without bringing it all from backup? it's a large 2TB database and it will take hours.
Is there a way like using flashback or other technology to do it?
We are talking 10.2.0.3 here...Its called "open the Standby database in read write mode for any reporting or testing and then move it back to standby database using the flashback technology".
In detail check this MOS note *How To Open Physical Standby For Read Write Testing and Flashback [ID 805438.1]*
Thanks.
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