{"id":21153,"date":"2022-12-20T18:03:12","date_gmt":"2022-12-20T17:03:12","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/?p=21153"},"modified":"2022-12-20T18:03:13","modified_gmt":"2022-12-20T17:03:13","slug":"db-systems-backup-on-oda","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/db-systems-backup-on-oda\/","title":{"rendered":"DB Systems backup on ODA"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Introduction<\/h2>\n\n\n\n<p>All Oracle Database Appliances running recent versions of the patch (19.1x) are now able to run bare metal databases, virtualized databases or both. A virtualized database is actually a single database in a dedicated VM called a DB System. This is exactly what you can find in OCI, the Oracle public cloud. This feature is very convenient to isolate databases in different networks, and dedicate a limited amount of memory and CPU resources. You may think that these DB Systems have a kind of backup command proposed by odacli, but it does not exist for now.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>odacli -h | grep dbsystem | sort | uniq\n\t\tcreate-dbsystem\n\t\tdelete-dbsystem\n\t\tdescribe-dbsystem\n\t\tdescribe-dbsystem-image\n\t\tlist-dbsystems\n\t\tmodify-dbsystem\n\t\tstart-dbsystem\n\t\tstop-dbsystem\n\tdbsystem-image:\n\tdbsystem:<\/code><\/pre>\n\n\n\n<p>Is there a solution to make simple backups of these DB Systems? Let&#8217;s try to find out.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">DB Systems and storage<\/h2>\n\n\n\n<p>DB Systems use 2 kind of storages. A vdisk for the system itself, and ASM storage for data and recovery area. The ASM storage proposed in a DB System is nothing else than the ASM storage of your ODA, and it&#8217;s shared accross all VMs. ASM storage is only used for database files, and as you know you will backup your database using classic RMAN scripts or with odacli which rely on RMAN.<\/p>\n\n\n\n<p>There is no tool to backup the vdisk, the vdisk being an hidden file on this filesystem: \/u05\/app\/sharedrepo\/<code>hostname<\/code>. It&#8217;s not an issue not having backups of this vdisk because you would normally be able to restore the RMAN backup of your database on another DB System. DB System are not supposed to be tuned manually. The only operation that is normally supported is to modify the DB System with modify-dbsystem, mainly to change its shape (resources allocation).<\/p>\n\n\n\n<p>Most probably, nothing will never corrupt or destroy your DB System, but as you never know, it could be nice to do backups from time to time, just in case.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Identifying the vdisk<\/h2>\n\n\n\n<p>Let&#8217;s list the DB Systems on my ODA:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>odacli list-dbsystems\nName                  Shape       Cores  Memory      GI version          DB version          Status           Created                   Updated\n--------------------  ----------  -----  ----------  ------------------  ------------------  ---------------  ------------------------  ------------------------\nsrvdb01               odb2        2      16.00 GB    19.16.0.0.220719    19.16.0.0.220719    CONFIGURED       2022-11-04 15:03:28 CET   2022-11-04 15:29:51 CET<\/code><\/pre>\n\n\n\n<p>Finding the associated vdisk of this unique DB System is quite easy:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>odacli describe-dbsystem -n srvdb01 | grep \"VM image\"\n            VM image path:  \/u05\/app\/sharedrepo\/srvdb01\/.ACFS\/snaps\/vm_x9622f3fdf\/x9622f3fdf<\/code><\/pre>\n\n\n\n<p>My DB System is running, so the vdisk is continuously updated:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ls -lrth \/u05\/app\/sharedrepo\/srvdb01\/.ACFS\/snaps\/vm_x9622f3fdf\/x9622f3fdf\n-rw-r--r-- 1 qemu qemu 53G Dec 20 14:54 \/u05\/app\/sharedrepo\/srvdb01\/.ACFS\/snaps\/vm_x9622f3fdf\/x9622f3fdf\n\nsleep 60 ; ls -lrth \/u05\/app\/sharedrepo\/srvdb01\/.ACFS\/snaps\/vm_x9622f3fdf\/x9622f3fdf\n-rw-r--r-- 1 qemu qemu 53G Dec 20 14:55 \/u05\/app\/sharedrepo\/srvdb01\/.ACFS\/snaps\/vm_x9622f3fdf\/x9622f3fdf<\/code><\/pre>\n\n\n\n<p>A clean backup will first need stopping the DB System:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>odacli stop-dbsystem -n srvdb01\nodacli describe-dbsystem -n srvdb01 | grep \"Current State\"\n            Current State:  OFFLINE<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Backing up the vdisk<\/h2>\n\n\n\n<p>Now let&#8217;s copy the vdisk on a backup location. In this example I will use my ACFS recovery area volume but in real life it will probably be a NFS share:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>cp \/u05\/app\/sharedrepo\/srvdb01\/.ACFS\/snaps\/vm_x9622f3fdf\/x9622f3fdf \/u03\/app\/oracle\/`date +\"%Y%m%d_%H%M\"`_srvdb01_vdisk.bck\n<\/code><\/pre>\n\n\n\n<p>Let&#8217;s check if everything is OK with the copy:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>md5sum \/u03\/app\/oracle\/20221220_1501_srvdb01_vdisk.bck\nc00c5d1908eca913b5893c277540439b  \/u03\/app\/oracle\/20221220_1501_srvdb01_vdisk.bck\n\nmd5sum \/u05\/app\/sharedrepo\/srvdb01\/.ACFS\/snaps\/vm_x9622f3fdf\/x9622f3fdf\nc00c5d1908eca913b5893c277540439b  \/u05\/app\/sharedrepo\/srvdb01\/.ACFS\/snaps\/vm_x9622f3fdf\/x9622f3fdf<\/code><\/pre>\n\n\n\n<p>Now I can start again my DB System:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>odacli start-dbsystem -n srvdb01\n\nodacli describe-dbsystem -n srvdb01 | grep \"Current State\"\n            Current State:  ONLINE\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Destroying my DB System<\/h2>\n\n\n\n<p>Destroying systems and databases is always easy! Let&#8217;s connect to the DB System using its private IP:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>odacli describe-dbsystem -n srvdb01 | grep \"ASM:\"\n                      ASM:  192.168.17.4    \/ 255.255.255.128 \/ ens4 \/ BRIDGE(privasm) VLAN(priv0.100)\n\nssh 192.168.17.4\nFIPS mode initialized\nroot@192.168.17.4's password:\nLast login: Tue Dec 20 14:32:50 2022 from 192.168.17.2\nps -ef | grep pmon\noracle   19650     1  0 15:31 ?        00:00:00 ora_pmon_VDBITST\nroot     25612 25327  0 15:33 pts\/0    00:00:00 grep --color=auto pmon<\/code><\/pre>\n\n\n\n<p>I will create a table before destroying the system:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>su - oracle\n. oraenv &lt;&lt;&lt; VDBITST\nsqlplus \/ as sysdba\nSQL&gt; create table before_the_crash as select sysdate \"THE_DATE\" from dual;\n\nTable created.\n\nSQL&gt; exit;\n\nexit\n<\/code><\/pre>\n\n\n\n<p>My database VDBITST is running fine, but it will end soon.<\/p>\n\n\n\n<p>Let&#8217;s destroy the \/ filesystem:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>rm -rf \/\nrm: it is dangerous to operate recursively on '\/'\nrm: use --no-preserve-root to override this failsafe\nrm -rf \/ --no-preserve-root\n...\ndf -h\n-bash: df: command not found\nshutdown -h now\n-bash: shutdown: command not found\n\nexit\nConnection to 192.168.17.4 closed by remote host.\nConnection to 192.168.17.4 closed.<\/code><\/pre>\n\n\n\n<p>My DB System is not working correctly anymore. Let&#8217;s stop it from the ODA:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>odacli stop-dbsystem -n srvdb01\nodacli describe-dbsystem -n srvdb01 | grep \"Current State\"\n            Current State:  ONLINE\nsleep 30 ; odacli describe-dbsystem -n srvdb01 | grep \"Current State\"\n            Current State:  ONLINE\nsleep 30 ; odacli describe-dbsystem -n srvdb01 | grep \"Current State\"\n            Current State:  ONLINE\n\nodacli describe-job -i 7a450741-589a-4c6c-9f80-3888a52db91e\n\nJob details\n----------------------------------------------------------------\n                     ID:  7a450741-589a-4c6c-9f80-3888a52db91e\n            Description:  DB System srvdb01 stop\n                 Status:  Running\n                Created:  December 20, 2022 3:36:46 PM CET\n                Message:\n\nTask Name                                Start Time                          End Time                            Status\n---------------------------------------- ----------------------------------- ----------------------------------- ----------\nStop DB System                           December 20, 2022 3:36:46 PM CET    December 20, 2022 3:36:46 PM CET    Running\n\nodacli describe-job -i 7a450741-589a-4c6c-9f80-3888a52db91e\n\nJob details\n----------------------------------------------------------------\n                     ID:  7a450741-589a-4c6c-9f80-3888a52db91e\n            Description:  DB System srvdb01 stop\n                 Status:  Success\n                Created:  December 20, 2022 3:36:46 PM CET\n                Message:\n\nTask Name                                Start Time                          End Time                            Status\n---------------------------------------- ----------------------------------- ----------------------------------- ----------\nStop DB System                           December 20, 2022 3:36:46 PM CET    December 20, 2022 3:46:50 PM CET    Success\n<\/code><\/pre>\n\n\n\n<p>It took 10 minutes to shut down because odacli didn&#8217;t managed to do a clean stop, obviously.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Restoring the DB System<\/h2>\n\n\n\n<p>Restoring the DB System is actually restoring the vdisk. So let&#8217;s copy back the clean vdisk image from my backup folder:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>mv \/u05\/app\/sharedrepo\/srvdb01\/.ACFS\/snaps\/vm_x9622f3fdf\/x9622f3fdf \/u05\/app\/sharedrepo\/srvdb01\/.ACFS\/snaps\/vm_x9622f3fdf\/x9622f3fdf.old\n\ncp \/u03\/app\/oracle\/20221220_1501_srvdb01_vdisk.bck \/u05\/app\/sharedrepo\/srvdb01\/.ACFS\/snaps\/vm_x9622f3fdf\/x9622f3fdf<\/code><\/pre>\n\n\n\n<p>Let&#8217;s then start again the DB System:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>odacli start-dbsystem -n srvdb01\nodacli describe-dbsystem -n srvdb01 | grep \"Current State\"\n            Current State:  ONLINE<\/code><\/pre>\n\n\n\n<p>And finally, let&#8217;s connect to it and check if everything is OK:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ssh 192.168.17.4\nFIPS mode initialized\nroot@192.168.17.4's password:\nLast login: Tue Dec 20 14:32:50 2022 from 192.168.17.2\ndf -h\nFilesystem                             Size  Used Avail Use% Mounted on\ndevtmpfs                               7.7G   16K  7.7G   1% \/dev\ntmpfs                                  7.8G     0  7.8G   0% \/dev\/shm\ntmpfs                                  7.8G  8.7M  7.7G   1% \/run\ntmpfs                                  7.8G     0  7.8G   0% \/sys\/fs\/cgroup\n\/dev\/mapper\/VolGroupVm-LogVolRoot       30G  3.5G   25G  13% \/\n\/dev\/mapper\/VolGroupVm-LogVolOpt        25G  5.6G   18G  24% \/opt\n\/dev\/mapper\/VolGroupVm-LogVolU01        99G   26G   68G  28% \/u01\n\/dev\/vda1                              942M  113M  765M  13% \/boot\n192.168.17.2:\/opt\/oracle\/oak\/pkgrepos   50G   38G  9.1G  81% \/opt\/oracle\/oak\/pkgrepos\ntmpfs                                  1.6G     0  1.6G   0% \/run\/user\/0\n\nps -ef | grep pmon\noracle   17286     1  0 15:58 ?        00:00:00 ora_pmon_VDBITST\nroot     18790 14644  0 15:58 pts\/0    00:00:00 grep --color=auto pmon<\/code><\/pre>\n\n\n\n<p>It looks fine.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What about my table?<\/h2>\n\n\n\n<p>Let&#8217;s check if the database is OK and if the table created before the crash but after the vdisk backup is still there:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>su - oracle\n. oraenv &lt;&lt;&lt; VDBITST\nsqlplus \/ as sysdba\nSQL&gt; select status from v$instance;\n\nSTATUS\n------------\nOPEN\n\nSQL&gt; create table back_to_life as select sysdate \"THE_DATE\" from dual;\n\nTable created.\n\nSQL&gt; alter session set nls_date_format='YYYYMMDD HH24MI';\n\nSession altered.\n\nSQL&gt; select the_date from back_to_life;\n\nTHE_DATE\n-------------\n20221220 1600\n\nSQL&gt; select the_date from before_the_crash;\n\nTHE_DATE\n-------------\n20221220 1536\n<\/code><\/pre>\n\n\n\n<p>My DB System is back, and my database is OK. Data created after the vdisk backup was done is still there as expected.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p>odacli may include a backup feature for the DB Systems in a future release. But for now, doing a cold backup of the vdisks from time to time is a nice solution.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>How to backup DB Systems on Oracle Database Appliance<\/p>\n","protected":false},"author":45,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[59],"tags":[2792,2794,2793,2795,2797,2496,2796,79,2791,96,365,1330,1331,1332,1697,1698,1699,2427,2682,2429],"type_dbi":[],"class_list":["post-21153","post","type-post","status-publish","format-standard","hentry","category-oracle","tag-backup-db-system","tag-backup-db-system-2","tag-backup-dbsystem","tag-backup-vm","tag-db-system-2","tag-dbsystem","tag-kvm-backup","tag-oda","tag-odacli-backup-dbsystem","tag-oracle","tag-oracle-database-appliance","tag-x7-2ha","tag-x7-2m","tag-x7-2s","tag-x8-2ha","tag-x8-2m","tag-x8-2s","tag-x9-2ha","tag-x9-2l","tag-x9-2s"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.2) - 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Ten years ago, he specialized in the Oracle Database technology. His expertise is focused on database architectures, high availability (RAC), disaster recovery (DataGuard), backups (RMAN), performance analysis and tuning (AWR\/statspack), migration, consolidation and appliances, especially ODA (his main projects during the last years). Prior to joining dbi services, J\u00e9r\u00f4me Dubar worked in a Franco-Belgian IT service company as Database team manager and main consultant for 7 years. He also worked for 5 years in a software editor company as technical consultant across France. He was also teaching Oracle Database lessons for 9 years. J\u00e9r\u00f4me Dubar holds a Computer Engineering degree from the Lille Sciences and Technologies university in northern France. 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