Hemesh RAC Edition: 2011

Thursday, 23 June 2011

Troubleshooting RAC Public Network Failure

Here are some steps I used to troubleshoot the failure of a public network used for SCAN in a 2-node RAC cluster.

Note: I used an aliased crsstat for the command: crsctl stat res –t

Check the status of the Clusterware resources. You can see that there are several resources that are offline below. The ones highlighted in red are the ones we are interested in. The resource for the local listener is now offline while the VIP has been failed over. You will also notice that all of the SCAN Listeners have been failed over to the surviving node.

grid@tibora30[+ASM1]-/u01/11.2.0/grid/log/tibora30 >crsstat
--------------------------------------------------------------------------------
NAME TARGET STATE SERVER STATE_DETAILS
--------------------------------------------------------------------------------
Local Resources
--------------------------------------------------------------------------------
ora.DG_DATA.dg
ONLINE ONLINE tibora30
ONLINE ONLINE tibora31
ora.DG_FLASH.dg
ONLINE ONLINE tibora30
ONLINE ONLINE tibora31
ora.LISTENER.lsnr
ONLINE OFFLINE tibora30
ONLINE ONLINE tibora31
ora.asm
ONLINE ONLINE tibora30 Started
ONLINE ONLINE tibora31 Started
ora.gsd
OFFLINE OFFLINE tibora30
OFFLINE OFFLINE tibora31
ora.net1.network
ONLINE ONLINE tibora30
ONLINE ONLINE tibora31
ora.ons
ONLINE ONLINE tibora30
ONLINE OFFLINE tibora31
ora.registry.acfs
ONLINE ONLINE tibora30
ONLINE ONLINE tibora31
--------------------------------------------------------------------------------
Cluster Resources
--------------------------------------------------------------------------------
ora.LISTENER_SCAN1.lsnr
1 ONLINE ONLINE tibora31
ora.LISTENER_SCAN2.lsnr
1 ONLINE ONLINE tibora31
ora.LISTENER_SCAN3.lsnr
1 ONLINE ONLINE tibora31
ora.cvu
1 ONLINE OFFLINE
ora.oc4j
1 ONLINE ONLINE tibora31
ora.scan1.vip
1 ONLINE ONLINE tibora30
ora.scan2.vip
1 ONLINE ONLINE tibora31
ora.scan3.vip
1 ONLINE ONLINE tibora31
ora.tibora30.vip
1 ONLINE INTERMEDIATE tibora31 FAILED OVER
ora.tibora31.vip
1 ONLINE ONLINE tibora31
ora.tibprd.db
1 ONLINE ONLINE tibora30 Open
2 ONLINE ONLINE tibora31 Open
ora.tibprd.tibprd_applog.svc
1 ONLINE ONLINE tibora31
ora.tibprd.tibprd_basic.svc
1 ONLINE ONLINE tibora31
ora.tibprd.tibprd_smap.svc
1 ONLINE ONLINE tibora31

Then look at the CRS logs under $GI_HOME/log/hostname/alerthostname.log for entries similar to the ones below:

2011-06-21 09:43:57.844

[/u01/11.2.0/grid/bin/orarootagent.bin(21168162)]CRS-5818:Aborted command 'check for resource: ora.net1.network tibora30 1' for resource 'ora.net1.network'. Details at (:CRSAGF00113:) {0:9:2} in /u01/11.2.0/grid/log/tibora30/agent/crsd/orarootagent_root/orarootagent_root.log.

2011-06-21 09:44:00.459

[/u01/11.2.0/grid/bin/oraagent.bin(22413372)]CRS-5016:Process "/u01/11.2.0/grid/opmn/bin/onsctli" spawned by agent "/u01/11.2.0/grid/bin/oraagent.bin" for action "check" failed: details at "(:CLSN00010:)" in "/u01/11.2.0/grid/log/tibora30/agent/crsd/oraagent_grid/oraagent_grid.log"

2011-06-21 09:44:01.112

[/u01/11.2.0/grid/bin/oraagent.bin(22413372)]CRS-5016:Process "/u01/11.2.0/grid/bin/lsnrctl" spawned by agent "/u01/11.2.0/grid/bin/oraagent.bin" for action "

check" failed: details at "(:CLSN00010:)" in "/u01/11.2.0/grid/log/tibora30/agent/crsd/oraagent_grid/oraagent_grid.log"

2011-06-21 09:44:01.180

[/u01/11.2.0/grid/bin/oraagent.bin(22413372)]CRS-5016:Process "/u01/11.2.0/grid/bin/lsnrctl" spawned by agent "/u01/11.2.0/grid/bin/oraagent.bin" for action "

check" failed: details at "(:CLSN00010:)" in "/u01/11.2.0/grid/log/tibora30/agent/crsd/oraagent_grid/oraagent_grid.log"

Check the status of the VIP on the node

grid@tibora30[+ASM1]-/u01/11.2.0/grid/log/tibora30 >srvctl status vip -n tibora30
VIP tibora30-vip is enabled
VIP tibora30-vip is not running

Also check the status of the SCAN resources.

grid@tibora30[+ASM1]-/u01/11.2.0/grid/log/tibora30 >srvctl status scan
SCAN VIP scan1 is enabled
SCAN VIP scan1 is running on node tibora30
SCAN VIP scan2 is enabled
SCAN VIP scan2 is running on node tibora31
SCAN VIP scan3 is enabled
SCAN VIP scan3 is running on node tibora31

In this particular case the SCAN VIPs were running on both nodes. It turns out that on another cluster which also experienced a network failure the SCAN VIPs were all running on node.

First we need to start the local listener:

grid@tibora30[+ASM1]-/u01/11.2.0/grid/log/tibora30 >srvctl start listener
Now check the status of the resources.
grid@tibora30[+ASM1]-/u01/11.2.0/grid/log/tibora30 >crsstat
--------------------------------------------------------------------------------
NAME TARGET STATE SERVER STATE_DETAILS
--------------------------------------------------------------------------------
Local Resources
--------------------------------------------------------------------------------
ora.DG_DATA.dg
ONLINE ONLINE tibora30
ONLINE ONLINE tibora31
ora.DG_FLASH.dg
ONLINE ONLINE tibora30
ONLINE ONLINE tibora31
ora.LISTENER.lsnr
ONLINE ONLINE tibora30
ONLINE ONLINE tibora31
ora.asm
ONLINE ONLINE tibora30 Started
ONLINE ONLINE tibora31 Started
ora.gsd
OFFLINE OFFLINE tibora30
OFFLINE OFFLINE tibora31
ora.net1.network
ONLINE ONLINE tibora30
ONLINE ONLINE tibora31
ora.ons
ONLINE ONLINE tibora30
ONLINE OFFLINE tibora31
ora.registry.acfs
ONLINE ONLINE tibora30
ONLINE ONLINE tibora31
--------------------------------------------------------------------------------
Cluster Resources
--------------------------------------------------------------------------------
ora.LISTENER_SCAN1.lsnr
1 ONLINE ONLINE tibora31
ora.LISTENER_SCAN2.lsnr
1 ONLINE ONLINE tibora31
ora.LISTENER_SCAN3.lsnr
1 ONLINE ONLINE tibora31
ora.cvu
1 ONLINE OFFLINE
ora.oc4j
1 ONLINE ONLINE tibora31
ora.scan1.vip
1 ONLINE ONLINE tibora30
ora.scan2.vip
1 ONLINE ONLINE tibora31
ora.scan3.vip
1 ONLINE ONLINE tibora31
ora.tibora30.vip
1 ONLINE ONLINE tibora30
ora.tibora31.vip
1 ONLINE ONLINE tibora31
ora.tibprd.db
1 ONLINE ONLINE tibora30 Open
2 ONLINE ONLINE tibora31 Open
ora.tibprd.tibprd_applog.svc
1 ONLINE ONLINE tibora31
ora.tibprd.tibprd_basic.svc
1 ONLINE ONLINE tibora31
ora.tibprd.tibprd_smap.svc
1 ONLINE ONLINE tibora31

Starting the local listener also caused the VIP to relocate to the previous node.

In another situation I had to manually relocate the VIP to the original node.

Next we need to check our nodeapps including ONS.

grid@tibora30[+ASM1]-/u01/11.2.0/grid/log/tibora30 >srvctl status nodeapps

VIP tibora30-vip is enabled

VIP tibora30-vip is running on node: tibora30

VIP tibora31-vip is enabled

VIP tibora31-vip is running on node: tibora31

Network is enabled

Network is running on node: tibora30

Network is running on node: tibora31

GSD is disabled

GSD is not running on node: tibora30

GSD is not running on node: tibora31

ONS is enabled

ONS daemon is running on node: tibora30

ONS daemon is not running on node: tibora31

Here you can see that the ONS daemon is not running on the tibora31.
To start the ONS daemon issue the following command:

grid@tibora30[+ASM1]-/u01/11.2.0/grid/log/tibora30 >srvctl start nodeapps -n tibora31

PRKO-2421 : Network resource is already started on node(s): tibora31

PRKO-2420 : VIP is already started on node(s): tibora31

Check the status of the nodeapps again

grid@tibora30[+ASM1]-/u01/11.2.0/grid/log/tibora30 >srvctl status nodeapps
VIP tibora30-vip is enabled
VIP tibora30-vip is running on node: tibora30
VIP tibora31-vip is enabled
VIP tibora31-vip is running on node: tibora31
Network is enabled
Network is running on node: tibora30
Network is running on node: tibora31
GSD is disabled
GSD is not running on node: tibora30
GSD is not running on node: tibora31
ONS is enabled
ONS daemon is running on node: tibora30
ONS daemon is running on node: tibora31

The CVU resource can be started as follows:

grid@tibora30[+ASM1]-/u01/11.2.0/grid/log/tibora30 >srvctl start cvu -n tibora30

You can now verify connectivity to the database/services. I prefer to use SQL Developer to test connectivity to my databases with one connection for each service name.

All the SCAN listeners were running on a single node. At least one needed to be relocated to service the requests coming from the SCAN on that node.

grid@tibora31[+ASM2]-/home/grid >srvctl relocate scan_listener -i 1 -n tibora30
grid@tibora31[+ASM2]-/home/grid >srvctl status scan_listener
SCAN Listener LISTENER_SCAN1 is enabled
SCAN listener LISTENER_SCAN1 is running on node tibora30
SCAN Listener LISTENER_SCAN2 is enabled
SCAN listener LISTENER_SCAN2 is running on node tibora31
SCAN Listener LISTENER_SCAN3 is enabled
SCAN listener LISTENER_SCAN3 is running on node tibora31

Once the SCAN was relocated the application connected successfully.

Thursday, 17 March 2011

Stopping the Oracle RAC 10g Environment

The first step is to stop the Oracle instance. When the instance (and related services) is down, then bring down the ASM instance. Finally, shut down the node applications (Virtual IP, GSD, TNS Listener, and ONS).

$ export ORACLE_SID=orcl1 $ emctl stop dbconsole $ srvctl stop instance -d orcl -i orcl1 $ srvctl stop asm -n linux1 $ srvctl stop nodeapps -n linux1

Starting the Oracle RAC 10g Environment

The first step is to start the node applications (Virtual IP, GSD, TNS Listener, and ONS). When the node applications are successfully started, then bring up the ASM instance. Finally, bring up the Oracle instance (and related services) and the Enterprise Manager Database console.

$ export ORACLE_SID=orcl1 $ srvctl start nodeapps -n linux1 $ srvctl start asm -n linux1 $ srvctl start instance -d orcl -i orcl1 $ emctl start dbconsole

Start/Stop All Instances with SRVCTL

Start/stop all the instances and their enabled services. I have included this step just for fun as a way to bring down all instances!

$ srvctl start database -d orcl  $ srvctl stop database -d orcl

**************************************************************************************

A brief Summary of Steps to Start / Shutdown RAC/ASM Setup (Oracle 11g):

Shutdown

1. shutdown database
srvctl stop database -d  "that will shutdown ALL running instances of "
srvctl stop instance -d  -i  "that will shutdown only specified instance of , other running instances will continue to run"

2. shutdown ASM
srvctl stop asm -n  "run it for every rac node one-by-one"

3. shutdown nodeapps
srvctl stop nodeapps -n  "run it for every rac node one-by-one"

4. Shutdown crs processes
crsctl stop crs
Startup

1. crsctl start crs -> that will start crs processes (HA-Engine), NodeApps, then ASM then Database's Instances then HA-Services (if any)

Thursday, 10 March 2011

Migrate OCR and Voting Disk from External to High Redundancy disk group in Oracle ASM

Multiple OCRs and vote disks on ASM in Oracle 11gR2 « Guenadi N Jilevski's Oracle BLOG

Voting Disk and OCR in 11gR2 On ASM Storage

Having just delivered an Oracle Database 11gR2 RAC Admin course, I’d like to point out some remarkable changes in the way we handle now the important Clusterware components Voting Disk and Oracle Cluster Registry (OCR): Amazingly, we can now store the two inside of an Automatic Storage Management (ASM) Disk Group, which was not possible in 10g.

Then you cannot create more than 1 voting disk in the same or on another/different diskgroup disk when using External Redundancy in 11.2.

The rules are as follows:

External = 1 voting disk

Normal= 3 voting disk

High= 5 voting disk

External redundancy diskgroup depends on the third party hardware vendor to handle the redundancy.

If you want to have the voting disk multiplexed at ASM level then it is recommended you change your redundancy to Normal so that ASM provides this redundancy for you.

The OCR is striped and mirrored (if we have a redundancy other than external), similar as ordinary Database Files are. So we can now leverage the mirroring capabilities of ASM to mirror the OCR also, without having to use multiple RAW devices for that purpose only. The Voting Disk (or Voting File, as it is now also referred to) is not striped but put as a whole on ASM Disks – if we use a redundancy of normal on the Diskgroup, 3 Voting Files are placed, each on one ASM Disk. This is a concern, if our ASM Diskgroups consist of only 2 ASM Disks! Therefore, the new quorum failgroup clause was introduced:

create diskgroup data normal redundancy

failgroup fg1 disk 'ORCL:ASMDISK1'

failgroup fg2 disk 'ORCL:ASMDISK2'

quorum failgroup fg3 disk 'ORCL:ASMDISK3'

attribute 'compatible.asm' = '11.2.0.0.0';

The failgroup fg3 above needs only one small Disk (300 MB should be on the safe side here, since the Voting File is only about 280 MB in size) to keep one Mirror of the Voting File. fg1 and fg2 will contain each one Voting File and all the other stripes of the Database Area as well, but fg3 will only get that one Voting File.

[root@uhesse1 ~]#  /u01/app/11.2.0/grid/bin/crsctl query css votedisk
  ##  STATE    File Universal Id                File Name Disk group
  --  -----    -----------------                --------- ---------
   1. ONLINE   511de6e64e354f9bbf4be318fc928c28 (ORCL:ASMDISK1) [DATA]
   2. ONLINE   2f1973ed4be84f50bffc2475949b428f (ORCL:ASMDISK2) [DATA]
   3. ONLINE   5ed44fb7e79c4f79bfaf09b402ba70df (ORCL:ASMDISK3) [DATA]

Another important change regarding the Voting File is that it is no longer supported to take a manual backup of it with dd. Instead, the Voting File gets backed up automatically into the OCR. As a New Feature, you can now do a manual backup of the OCR any time you like, without having to wait until that is done automatically – which is also still done:

[root@uhesse1 ~]# /u01/app/11.2.0/grid/bin/ocrconfig -showbackup

uhesse1 2010/10/06 09:37:30 /u01/app/11.2.0/grid/cdata/cluhesse/backup00.ocr

uhesse1 2010/10/06 05:37:29 /u01/app/11.2.0/grid/cdata/cluhesse/backup01.ocr

uhesse1 2010/10/06 01:37:27 /u01/app/11.2.0/grid/cdata/cluhesse/backup02.ocr

uhesse1 2010/10/05 01:37:21 /u01/app/11.2.0/grid/cdata/cluhesse/day.ocr

uhesse1 2010/10/04 13:37:19 /u01/app/11.2.0/grid/cdata/cluhesse/week.ocr

Above are the automatic backups of the OCR as in earlier versions. Now the manual backup:

[root@uhesse1 ~]# /u01/app/11.2.0/grid/bin/ocrconfig -manualbackup

uhesse1 2010/10/06 13:07:03 /u01/app/11.2.0/grid/cdata/cluhesse/backup_20101006_130703.ocr

I got a manual backup on the default location on my master node. We can define another backup location for the automatic backups as well as for the manual backups – preferrable on a Shared Device that is accessible by all the nodes (which is not the case with /home/oracle, unfortunately ):

[root@uhesse1 ~]# /u01/app/11.2.0/grid/bin/ocrconfig -backuploc /home/oracle

[root@uhesse1 ~]# /u01/app/11.2.0/grid/bin/ocrconfig -manualbackup

uhesse1 2010/10/06 13:10:50 /home/oracle/backup_20101006_131050.ocr