{"id":17166,"date":"2022-04-14T16:39:06","date_gmt":"2022-04-14T14:39:06","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/oracle-21c-dealing-with-faststartfailoveractiononprecalloutfailure\/"},"modified":"2023-06-20T10:14:20","modified_gmt":"2023-06-20T08:14:20","slug":"oracle-21c-dealing-with-faststartfailoveractiononprecalloutfailure","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/oracle-21c-dealing-with-faststartfailoveractiononprecalloutfailure\/","title":{"rendered":"Oracle 21c : Dealing with FastStartFailoverActionOnPreCalloutFailure"},"content":{"rendered":"

By Mouhamadou Diaw<\/strong><\/p>\n

In a previous blog <\/a>I talked about the FSFO callout scripts which is a new feature with Oracle 21c with the broker.<\/p>\n

This feature will allow to execute some tasks before and after a fast-start failover. By default, the automatic failover will not happen if the pre-script fails. Maybe it’s not what we want, sometimes we will want to continue the automatic failover even if the pre-tasks did not execute successfully.<\/p>\n

Oracle has a parameter for this, it is the FastStartFailoverActionOnPreCalloutFailure. This parameter has two values :
\nSTOP: the FSFO will not happen if there is not a .suc file (the pre-tasks fail)
\nCONTINUE: the FSFO will continue even if the pre-tasks fail<\/p>\n

In this blog I do some tests with this parameter and show the results. Below the configuration I used, the same that the one used in my previous blog <\/a><\/p>\n

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DGMGRL> show configuration<\/code><\/div>\n
<\/div>\n
Configuration - db21<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0<\/code>Protection Mode: MaxPerformance<\/code><\/div>\n
\u00a0\u00a0<\/code>Members:<\/code><\/div>\n
\u00a0\u00a0<\/code>DB21_SITE1 - <\/code>Primary<\/code> database<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>DB21_SITE2 - (*) Physical standby <\/code>database<\/code><\/div>\n
<\/div>\n
Fast-Start Failover: Enabled <\/code>in<\/code> Potential Data Loss Mode<\/code><\/div>\n
<\/div>\n
Configuration Status:<\/code><\/div>\n
SUCCESS\u00a0\u00a0 (status updated 17 seconds ago)<\/code><\/div>\n
<\/div>\n
DGMGRL><\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

FastStartFailoverActionOnPreCalloutFailure=STOP<\/strong><\/p>\n

The first tests are done with the parameter set to STOP. Below my callout scripts<\/p>\n

fsfocallout.ora script with the value=STOP<\/p>\n

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oracle@oraadserver3:<\/code>\/u01\/app\/oracle\/admin\/prod20\/broker_files\/config_db21\/callout\/<\/code> [DB21 (CDB$ROOT)] <\/code>cat<\/code> fsfocallout.ora | <\/code>grep<\/code> -<\/code>v<\/code> ^<\/code>#<\/code><\/div>\n
FastStartFailoverPreCallout=fsfo_precallout<\/code><\/div>\n
FastStartFailoverPreCalloutTimeout=25<\/code><\/div>\n
FastStartFailoverPreCalloutSucFileName=fsfo_precallout.suc<\/code><\/div>\n
FastStartFailoverPreCalloutErrorFileName=fsfo_precallout.err<\/code><\/div>\n
FastStartFailoverActionOnPreCalloutFailure=STOP<\/code><\/div>\n
FastStartFailoverPostCallout=fsfo_postcallout<\/code><\/div>\n
oracle@oraadserver3:<\/code>\/u01\/app\/oracle\/admin\/prod20\/broker_files\/config_db21\/callout\/<\/code> [DB21 (CDB$ROOT)]<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

fsfo_precallout script with errors inside<\/p>\n

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oracle@oraadserver3:<\/code>\/u01\/app\/oracle\/admin\/prod20\/broker_files\/config_db21\/callout\/<\/code> [DB21 (CDB$ROOT)] <\/code>cat<\/code> fsfo_precallout<\/code><\/div>\n
#! \/bin\/bash<\/code><\/div>\n
if<\/code> [ 1 -lt 100 ]<\/code><\/div>\n
\u00a0<\/code>then<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>touch<\/code> \/temp\/test<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>echo<\/code> \"starting fun observer\"<\/code> > <\/code>\/temp\/test<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>echo<\/code> \"starting fun observer\"<\/code> > <\/code>\/temp\/test<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>touch<\/code>\u00a0 \/u01\/app\/oracle\/aadmin\/prod20\/broker_files\/config_db21\/callout\/fsfo_precallout<\/code>.suc<\/code><\/div>\n
else<\/code><\/div>\n
\u00a0\u00a0<\/code>touch<\/code> \/u01\/app\/oracle\/admin\/prod20\/broker_files\/config_db21\/callout\/fsfo_precallout<\/code>.err<\/code><\/div>\n
fi<\/code><\/div>\n
oracle@oraadserver3:<\/code>\/u01\/app\/oracle\/admin\/prod20\/broker_files\/config_db21\/callout\/<\/code> [DB21 (CDB$ROOT)]<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

As you may see, I did some mistakes (\/temp instead of \/tmp, aadmin instead of admin) in the script so that the pre-tasks will not finish successfully.<\/p>\n

Now let’s simulate a Failover to validate the expected behavior<\/p>\n

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SQL> <\/code>select<\/code> db_unique_name,open_mode <\/code>from<\/code> v$<\/code>database<\/code>;<\/code><\/div>\n
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DB_UNIQUE_NAME\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 OPEN_MODE<\/code><\/div>\n
------------------------------ --------------------<\/code><\/div>\n
db21_site1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/code>READ<\/code> WRITE<\/code><\/div>\n
<\/div>\n
SQL> shut abort<\/code><\/div>\n
ORACLE instance shut down.<\/code><\/div>\n
SQL><\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

After the shutdown abort of the primary, we can see in the observer logfile, that the automatic failover did not happen because of the value of the parameter FastStartFailoverActionOnPreCalloutFailure=STOP<\/p>\n

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[W000 2022-04-13T11:07:07.786+02:00] Fast-Start Failover is not enabled or can't be checked. Retry after 15 seconds.<\/code><\/div>\n
[W000 2022-04-13T11:07:22.792+02:00] Standby database has changed to DB21_SITE2.<\/code><\/div>\n
[W000 2022-04-13T11:07:22.794+02:00] Try to connect to the primary.<\/code><\/div>\n
[W000 2022-04-13T11:07:22.794+02:00] Try to connect to the primary DB21_SITE1.<\/code><\/div>\n
[W000 2022-04-13T11:07:24.028+02:00] Connection to the primary restored!<\/code><\/div>\n
[W000 2022-04-13T11:07:24.034+02:00] The standby DB21_SITE2 is ready to be a FSFO target<\/code><\/div>\n
[W000 2022-04-13T11:07:26.036+02:00] Disconnecting from database DB21_SITE1.<\/code><\/div>\n
[W000 2022-04-13T11:24:02.493+02:00] Primary database cannot be reached.<\/code><\/div>\n
[W000 2022-04-13T11:24:02.494+02:00] Fast-Start Failover threshold has not exceeded. Retry <\/code>for<\/code> the next 15 seconds<\/code><\/div>\n
[W000 2022-04-13T11:24:03.496+02:00] Try to connect to the primary.<\/code><\/div>\n
[W000 2022-04-13T11:24:05.797+02:00] Primary database cannot be reached.<\/code><\/div>\n
[W000 2022-04-13T11:24:06.799+02:00] Try to connect to the primary.<\/code><\/div>\n
[W000 2022-04-13T11:24:19.665+02:00] Primary database cannot be reached.<\/code><\/div>\n
[W000 2022-04-13T11:24:19.665+02:00] Fast-Start Failover threshold has expired.<\/code><\/div>\n
[W000 2022-04-13T11:24:19.666+02:00] Succeeded to parse FSFO callout config <\/code>file<\/code> '\/u01\/app\/oracle\/admin\/prod20\/broker_files\/config_db21\/callout\/fsfocallout.ora'<\/code><\/div>\n
[W000 2022-04-13T11:24:19.666+02:00] Try to connect to the standby.<\/code><\/div>\n
[W000 2022-04-13T11:24:19.666+02:00] Check <\/code>if<\/code> the standby is ready <\/code>for<\/code> failover.<\/code><\/div>\n
[W000 2022-04-13T11:24:19.685+02:00] Doing pre-FSFO callout.<\/code><\/div>\n
[W000 2022-04-13T11:24:23.746+02:00] Failed to <\/code>ping<\/code> the primary.<\/code><\/div>\n
[W000 2022-04-13T11:24:29.821+02:00] Failed to <\/code>ping<\/code> the primary.<\/code><\/div>\n
[W000 2022-04-13T11:24:36.020+02:00] Failed to <\/code>ping<\/code> the primary.<\/code><\/div>\n
[W000 2022-04-13T11:24:41.040+02:00] Failed to <\/code>ping<\/code> the primary.<\/code><\/div>\n
[W000 2022-04-13T11:24:41.040+02:00] Failed to detect the pre-FSFO callout suc <\/code>file<\/code> '\/u01\/app\/oracle\/admin\/prod20\/broker_files\/config_db21\/callout\/fsfo_precallout.suc'<\/code>, or error <\/code>file<\/code> '\/u01\/app\/oracle\/admin\/prod20\/broker_files\/config_db21\/callout\/fsfo_precallout.err'<\/code>, after 25 seconds passed.<\/code><\/div>\n
[W000 2022-04-13T11:24:41.040+02:00] Will not <\/code>continue<\/code> Fast-Start Failover since pre-FSFO callout failure action is STOP<\/code><\/div>\n
[W000 2022-04-13T11:24:41.040+02:00] Returning to primary <\/code>ping<\/code> state.<\/code><\/div>\n
[W000 2022-04-13T11:24:41.040+02:00] Try to connect to the primary.<\/code><\/div>\n
[W000 2022-04-13T11:24:43.274+02:00] Primary database cannot be reached.<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

FastStartFailoverActionOnPreCalloutFailure=CONTINUE<\/strong><\/p>\n

If for any raison I want the fsfo to happen event if the pre-tasks fail, I have to explicitly set the value to CONTINUE<\/p>\n

Let’s do the same tests but with the parameter to CONTINUE<\/p>\n

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oracle@oraadserver3:<\/code>\/u01\/app\/oracle\/admin\/prod20\/broker_files\/config_db21\/callout\/<\/code> [DB21 (CDB$ROOT)] <\/code>cat<\/code> fsfocallout.ora | <\/code>grep<\/code> -<\/code>v<\/code> ^<\/code>#<\/code><\/div>\n
FastStartFailoverPreCallout=fsfo_precallout<\/code><\/div>\n
FastStartFailoverPreCalloutTimeout=25<\/code><\/div>\n
FastStartFailoverPreCalloutSucFileName=fsfo_precallout.suc<\/code><\/div>\n
FastStartFailoverPreCalloutErrorFileName=fsfo_precallout.err<\/code><\/div>\n
FastStartFailoverActionOnPreCalloutFailure=CONTINUE<\/code><\/div>\n
FastStartFailoverPostCallout=fsfo_postcallout<\/code><\/div>\n
oracle@oraadserver3:<\/code>\/u01\/app\/oracle\/admin\/prod20\/broker_files\/config_db21\/callout\/<\/code> [DB21 (CDB$ROOT)]<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

In the observer logfile, we can see that as expected the automatic failover happens because the value is CONTINUE for the parameter.<\/p>\n

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[W000 2022-04-13T11:36:15.409+02:00] Primary database cannot be reached.<\/code><\/div>\n
[W000 2022-04-13T11:36:15.410+02:00] Fast-Start Failover threshold has not exceeded. Retry <\/code>for<\/code> the next 15 seconds<\/code><\/div>\n
[W000 2022-04-13T11:36:16.410+02:00] Try to connect to the primary.<\/code><\/div>\n
[W000 2022-04-13T11:36:18.949+02:00] Primary database cannot be reached.<\/code><\/div>\n
[W000 2022-04-13T11:36:19.950+02:00] Try to connect to the primary.<\/code><\/div>\n
[W000 2022-04-13T11:36:30.063+02:00] Primary database cannot be reached.<\/code><\/div>\n
[W000 2022-04-13T11:36:30.063+02:00] Fast-Start Failover threshold has expired.<\/code><\/div>\n
[W000 2022-04-13T11:36:30.072+02:00] Succeeded to parse FSFO callout config <\/code>file<\/code> '\/u01\/app\/oracle\/admin\/prod20\/broker_files\/config_db21\/callout\/fsfocallout.ora'<\/code><\/div>\n
[W000 2022-04-13T11:36:30.072+02:00] Try to connect to the standby.<\/code><\/div>\n
[W000 2022-04-13T11:36:30.072+02:00] Check <\/code>if<\/code> the standby is ready <\/code>for<\/code> failover.<\/code><\/div>\n
[W000 2022-04-13T11:36:30.087+02:00] Doing pre-FSFO callout.<\/code><\/div>\n
[W000 2022-04-13T11:36:34.095+02:00] Failed to <\/code>ping<\/code> the primary.<\/code><\/div>\n
[W000 2022-04-13T11:36:40.146+02:00] Failed to <\/code>ping<\/code> the primary.<\/code><\/div>\n
[W000 2022-04-13T11:36:46.255+02:00] Failed to <\/code>ping<\/code> the primary.<\/code><\/div>\n
[W000 2022-04-13T11:36:52.311+02:00] Failed to <\/code>ping<\/code> the primary.<\/code><\/div>\n
[W000 2022-04-13T11:36:55.352+02:00] Failed to detect the pre-FSFO callout suc <\/code>file<\/code> '\/u01\/app\/oracle\/admin\/prod20\/broker_files\/config_db21\/callout\/fsfo_precallout.suc'<\/code>, or error <\/code>file<\/code> '\/u01\/app\/oracle\/admin\/prod20\/broker_files\/config_db21\/callout\/fsfo_precallout.err'<\/code>, after 25 seconds passed.<\/code><\/div>\n
[W000 2022-04-13T11:36:55.352+02:00] Will <\/code>continue<\/code> Fast-Start Failover since pre-FSFO callout failure action is CONTINUE<\/code><\/div>\n
[S006 2022-04-13T11:36:55.352+02:00] Fast-Start Failover started...<\/code><\/div>\n
<\/div>\n
2022-04-13T11:36:55.352+02:00<\/code><\/div>\n
Initiating Fast-Start Failover to database <\/code>\"DB21_SITE2\"<\/code>...<\/code><\/div>\n
[S006 2022-04-13T11:36:55.352+02:00] Initiating Fast-start Failover.<\/code><\/div>\n
2022-04-13T11:36:55.362+02:00<\/code><\/div>\n
Performing failover NOW, please wait...<\/code><\/div>\n
<\/div>\n
2022-04-13T11:37:18.566+02:00<\/code><\/div>\n
Failover succeeded, new primary is <\/code>\"DB21_SITE2\"<\/code>.<\/code><\/div>\n
<\/div>\n
2022-04-13T11:37:18.566+02:00<\/code><\/div>\n
Failover processing complete, broker ready.<\/code><\/div>\n
2022-04-13T11:37:18.566+02:00<\/code><\/div>\n
[S006 2022-04-13T11:37:18.566+02:00] Fast-Start Failover finished...<\/code><\/div>\n
[W000 2022-04-13T11:37:18.566+02:00] Failover succeeded. Restart pinging.<\/code><\/div>\n
[W000 2022-04-13T11:37:18.582+02:00] Primary database has changed to DB21_SITE2.<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Conclusion<\/h3>\n

We can just say that when dealing with fsfo callout scripts, be sure that the parameter FastStartFailoverActionOnPreCalloutFailure is correctly set according your wishes.<\/p>\n","protected":false},"excerpt":{"rendered":"

By Mouhamadou Diaw In a previous blog I talked about the FSFO callout scripts which is a new feature with Oracle 21c with the broker. This feature will allow to execute some tasks before and after a fast-start failover. By default, the automatic failover will not happen if the pre-script fails. Maybe it’s not what […]<\/p>\n","protected":false},"author":27,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[229,198,59],"tags":[2528,2512,2513,236],"type_dbi":[],"class_list":["post-17166","post","type-post","status-publish","format-standard","hentry","category-database-administration-monitoring","category-database-management","category-oracle","tag-faststartfailoveractiononprecalloutfailure","tag-fsfo-callout-scripts","tag-oracle-21c-borker-new-feature","tag-oracle-data-guard"],"acf":[],"yoast_head":"\nOracle 21c : Dealing with FastStartFailoverActionOnPreCalloutFailure - dbi Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dbi-services.com\/blog\/oracle-21c-dealing-with-faststartfailoveractiononprecalloutfailure\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Oracle 21c : Dealing with FastStartFailoverActionOnPreCalloutFailure\" \/>\n<meta property=\"og:description\" content=\"By Mouhamadou Diaw In a previous blog I talked about the FSFO callout scripts which is a new feature with Oracle 21c with the broker. This feature will allow to execute some tasks before and after a fast-start failover. By default, the automatic failover will not happen if the pre-script fails. 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