{"id":7070,"date":"2016-02-04T10:50:11","date_gmt":"2016-02-04T09:50:11","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/about-ocr-backup\/"},"modified":"2016-02-04T10:50:11","modified_gmt":"2016-02-04T09:50:11","slug":"about-ocr-backup","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/about-ocr-backup\/","title":{"rendered":"About OCR backup"},"content":{"rendered":"

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

Last day Franck and me were discussing about OCR backup<\/p>\n

Let’s take a 2 nodes RAC. We can see that OCR backup is automatically done by oracle in only one node on local (with a certain frequency every day, every week and every 4 hours))<\/p>\n

[oracle@racsrv2 ~]$ \/u01\/app\/12.1.0.2\/grid\/bin\/ocrconfig -showbackup<\/p>\n

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racsrv2\u00a0\u00a0\u00a0\u00a0 2016<\/code>\/02\/03<\/code> 19:58:05\u00a0\u00a0\u00a0\u00a0 <\/code>\/u01\/app\/12<\/code>.1.0.2<\/code>\/grid\/cdata\/racsrv-cluster\/backup00<\/code>.ocr\u00a0\u00a0\u00a0\u00a0 2528224568<\/code><\/div>\n
<\/div>\n
racsrv2\u00a0\u00a0\u00a0\u00a0 2016<\/code>\/02\/03<\/code> 15:58:03\u00a0\u00a0\u00a0\u00a0 <\/code>\/u01\/app\/12<\/code>.1.0.2<\/code>\/grid\/cdata\/racsrv-cluster\/backup01<\/code>.ocr\u00a0\u00a0\u00a0\u00a0 2528224568<\/code><\/div>\n
<\/div>\n
racsrv2\u00a0\u00a0\u00a0\u00a0 2016<\/code>\/02\/03<\/code> 11:58:02\u00a0\u00a0\u00a0\u00a0 <\/code>\/u01\/app\/12<\/code>.1.0.2<\/code>\/grid\/cdata\/racsrv-cluster\/backup02<\/code>.ocr\u00a0\u00a0\u00a0\u00a0 2528224568<\/code><\/div>\n
<\/div>\n
racsrv2\u00a0\u00a0\u00a0\u00a0 2016<\/code>\/02\/02<\/code> 23:57:57\u00a0\u00a0\u00a0\u00a0 <\/code>\/u01\/app\/12<\/code>.1.0.2<\/code>\/grid\/cdata\/racsrv-cluster\/day<\/code>.ocr\u00a0\u00a0\u00a0\u00a0 2528224568<\/code><\/div>\n
<\/div>\n
racsrv2\u00a0\u00a0\u00a0\u00a0 2016<\/code>\/02\/02<\/code> 23:57:57\u00a0\u00a0\u00a0\u00a0 <\/code>\/u01\/app\/12<\/code>.1.0.2<\/code>\/grid\/cdata\/racsrv-cluster\/week<\/code>.ocr\u00a0\u00a0\u00a0\u00a0 2528224568<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

But what is determining which node is doing the backup? It seems that backup is always done on the master node<\/p>\n

In our environment we have 2 servers and actually \u00a0the master is server racsrv2 as shown below<\/p>\n

[oracle@racsrv2 ~]$ \/u01\/app\/12.1.0.2\/grid\/bin\/olsnodes -s -n<\/p>\n

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\n
\n
racsrv1 1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Active<\/code><\/div>\n
racsrv2 2\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Active<\/code><\/div>\n
<\/div>\n
[oracle@racsrv1 ~]$ <\/code>grep<\/code> MASTER <\/code>\/u01\/app\/oracle\/diag\/crs\/racsrv1\/crs\/trace\/crsd<\/code>.trc<\/code><\/div>\n
2016-02-02 19:46:25.134016 :\u00a0 OCRMAS:3316590336: proath_master: SUCCESSFULLY CONNECTED TO THE MASTER<\/code><\/div>\n
2016-02-02 19:46:25.134024 :\u00a0 OCRMAS:3316590336: th_master: NEW OCR MASTER IS 2<\/code><\/div>\n
2016-02-02 19:46:26.235447 :\u00a0\u00a0 CRSPE:2637657856: {1:21661:2} PE MASTER NAME: racsrv2<\/code><\/div>\n
2016-02-02 19:52:26.126885 :\u00a0 CRSOCR:2646062848: {1:21661:2} Registered PE standby with CSS. I AM A STANDBY MASTER.<\/code><\/div>\n
<\/div>\n
[oracle@racsrv2 ~]$ <\/code>grep<\/code> MASTER <\/code>\/u01\/app\/oracle\/diag\/crs\/racsrv2\/crs\/trace\/crsd<\/code>.trc<\/code><\/div>\n
2016-02-02 19:46:45.355996 : default:3428738816:\u00a0 LIST_LOGS: 2016-02-02 19:46:45.343: proas_open: I AM THE MASTER NODE, key_name = [DATABASE.NODEAPPS]<\/code><\/div>\n
2016-02-02 19:46:45.356604 : default:2713634560:\u00a0 LIST_LOGS: 2016-02-02 19:46:45.346: proas_open: I AM THE MASTER NODE, key_name = [SYSTEM.ASM.DEFAULT_DISKGROUP]<\/code><\/div>\n
2016-02-02 19:46:45.356668 : default:3456055040:\u00a0 LIST_LOGS: 2016-02-02 19:46:45.347: proas_open: I AM THE MASTER NODE, key_name = [SYSTEM.ASM.DEFAULT_DISKGROUP]<\/code><\/div>\n
2016-02-02 19:46:51.407749 : default:3458156288:\u00a0 LIST_LOGS: 2016-02-02 19:46:51.407: proas_open: I AM THE MASTER NODE, key_name = [SYSTEM.ASM.DEFAULT_DISKGROUP]<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Ok since the backup location is not shared, what happens if my master node crashes and disks on this node no longer accessible. Did Oracle \u00a0immediately do a OCR backup on the new master\u00a0node?
\nLet’s simulate a crash of my master node (racsrv2) with a power off . We can see now that racsrv1 is the new master<\/p>\n

[oracle@racsrv1 ~]$ grep MASTER \/u01\/app\/oracle\/diag\/crs\/racsrv1\/crs\/trace\/crsd.trc<\/p>\n

\n
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\n
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\n
\n
2016-02-02 19:46:25.134016 :\u00a0 OCRMAS:3316590336: proath_master: SUCCESSFULLY CONNECTED TO THE MASTER<\/code><\/div>\n
2016-02-02 19:46:25.134024 :\u00a0 OCRMAS:3316590336: th_master: NEW OCR MASTER IS 2<\/code><\/div>\n
2016-02-02 19:46:26.235447 :\u00a0\u00a0 CRSPE:2637657856: {1:21661:2} PE MASTER NAME: racsrv2<\/code><\/div>\n
2016-02-02 19:52:26.126885 :\u00a0 CRSOCR:2646062848: {1:21661:2} Registered PE standby with CSS. I AM A STANDBY MASTER.<\/code><\/div>\n
2016-02-03 21:47:34.878814 :\u00a0 OCRMAS:3316590336: proath_master: GRPMASTER event. Ignored. Waiting <\/code>for<\/code> RCFG event <\/code>for<\/code> the old OCR Cache Writer:[2]. New Cache Writer:[1]<\/code><\/div>\n
2016-02-03 21:47:36.155945 :\u00a0 OCRMAS:3316590336: th_master:13: I AM THE NEW OCR MASTER at incar 3. Node Number 1<\/code><\/div>\n
2016-02-03 21:47:36.165548 :\u00a0 OCRSRV:2678048512: proas_amiwriter: ctx is MASTER CHANGING<\/code>\/CONNECTING<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

But no new OCR backup was automatically done immediately after racsrv1 crash as shown below (even after a few hours) and cluster is still referencing OCR backups on the racsrv2.<\/p>\n

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[root@racsrv1 tmp]<\/code># \/u01\/app\/12.1.0.2\/grid\/bin\/ocrconfig -showbackup<\/code><\/div>\n
<\/div>\n
racsrv2\u00a0\u00a0\u00a0\u00a0 2016<\/code>\/02\/03<\/code> 19:58:05\u00a0\u00a0\u00a0\u00a0 <\/code>\/u01\/app\/12<\/code>.1.0.2<\/code>\/grid\/cdata\/racsrv-cluster\/backup00<\/code>.ocr\u00a0\u00a0\u00a0\u00a0 2528224568<\/code><\/div>\n
<\/div>\n
racsrv2\u00a0\u00a0\u00a0\u00a0 2016<\/code>\/02\/03<\/code> 15:58:03\u00a0\u00a0\u00a0\u00a0 <\/code>\/u01\/app\/12<\/code>.1.0.2<\/code>\/grid\/cdata\/racsrv-cluster\/backup01<\/code>.ocr\u00a0\u00a0\u00a0\u00a0 2528224568<\/code><\/div>\n
<\/div>\n
racsrv2\u00a0\u00a0\u00a0\u00a0 2016<\/code>\/02\/03<\/code> 11:58:02\u00a0\u00a0\u00a0\u00a0 <\/code>\/u01\/app\/12<\/code>.1.0.2<\/code>\/grid\/cdata\/racsrv-cluster\/backup02<\/code>.ocr\u00a0\u00a0\u00a0\u00a0 2528224568<\/code><\/div>\n
<\/div>\n
racsrv2\u00a0\u00a0\u00a0\u00a0 2016<\/code>\/02\/02<\/code> 23:57:57\u00a0\u00a0\u00a0\u00a0 <\/code>\/u01\/app\/12<\/code>.1.0.2<\/code>\/grid\/cdata\/racsrv-cluster\/day<\/code>.ocr\u00a0\u00a0\u00a0\u00a0 2528224568<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

That means that if our OCR is now corrupted, no backup will be available to restore the OCR, and then we will have to reconstruct our cluster.<\/p>\n

To prevent this we can for example<\/p>\n

1- Backup the default OCR backups \u00a0(using os commands, using ocrconfig copy or using ocrconfig export)
\n2- Choose a shared place for the OCR backup location<\/p>\n","protected":false},"excerpt":{"rendered":"

By Mouhamadou Diaw Last day Franck and me were discussing about OCR backup Let’s take a 2 nodes RAC. We can see that OCR backup is automatically done by oracle in only one node on local (with a certain frequency every day, every week and every 4 hours)) [oracle@racsrv2 ~]$ \/u01\/app\/12.1.0.2\/grid\/bin\/ocrconfig -showbackup 1 2 3… <\/p>\n","protected":false},"author":27,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","neve_meta_reading_time":"","_themeisle_gutenberg_block_has_review":false,"footnotes":""},"categories":[4133],"tags":[],"class_list":["post-7070","post","type-post","status-publish","format-standard","hentry","category-database"],"yoast_head":"\nAbout OCR backup - dbi services | 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\/about-ocr-backup\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"About OCR backup\" \/>\n<meta property=\"og:description\" content=\"By Mouhamadou Diaw Last day Franck and me were discussing about OCR backup Let’s take a 2 nodes RAC. 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