Linux STRESS command usage example


During high CPU usage in kernel space we have noticed brownouts on our database nodes. For finding the reason of the problem we wanted to reproduce the issue and somehow trigger high %sy usage on our nodes.

I have found stress tool very useful and want to share my experience with you.


1. Install stress tool via yum:

# yum install stress

2. Stress has several options to use:

[root@rac1 ~]# stress

`stress' imposes certain types of compute stress on your system

Usage: stress [OPTION [ARG]] ...
 -?, --help         show this help statement
     --version      show version statement
 -v, --verbose      be verbose
 -q, --quiet        be quiet
 -n, --dry-run      show what would have been done
 -t, --timeout N    timeout after N seconds
     --backoff N    wait factor of N microseconds before work starts
 -c, --cpu N        spawn N workers spinning on sqrt()
 -i, --io N         spawn N workers spinning on sync()
 -m, --vm N         spawn N workers spinning on malloc()/free()
     --vm-bytes B   malloc B bytes per vm worker (default is 256MB)
     --vm-stride B  touch a byte every B bytes (default is 4096)
     --vm-hang N    sleep N secs before free (default none, 0 is inf)
     --vm-keep      redirty memory instead of freeing and reallocating
 -d, --hdd N        spawn N workers spinning on write()/unlink()
     --hdd-bytes B  write B bytes per hdd worker (default is 1GB)

Example: stress --cpu 8 --io 4 --vm 2 --vm-bytes 128M --timeout 10s

Note: Numbers may be suffixed with s,m,h,d,y (time) or B,K,M,G (size).

To cause high %sy you need to use –vm option and find appropriate number of workers, in my case 50 workers were enough to cause an issue.

In the following example, stress will run 50 workers and timeout for the run will be 200s:

# stress --vm 50 --timeout 200s

From another terminal tab, run top command to monitor %sy usage (81.2%) :

See short video demonstration below:


Rollback RU patches from 12c GI home using opatchauto

Junior DBAs will find these steps useful ūüôā

Environment details:

Two-node Real Application Cluster.
Database version:
Applied RU: 16-04-2019

1. Check existing patches

[grid@rac1 ~]$  /u01/app/12.2.0/grid/OPatch/opatch lspatches
29314424;OCW APR 2019 RELEASE UPDATE (29314424)
29314339;Database Apr 2019 Release Update : (29314339)
29301676;ACFS APR 2019 RELEASE UPDATE (29301676)
28566910;TOMCAT RELEASE UPDATE (28566910)
26839277;DBWLM RELEASE UPDATE (26839277)
OPatch succeeded.

Note that all these patches are part of RU 16-04-2019.

2. Stop all database instances on that node:

# srvctl stop instance -db orclA -i orclA1

3. Download Release Update 16-04-2019 (, unzip and go to the unzipped patch location:

To rollback all these patches it is easier to have unzipped Release Update 16-04-2019 patch (all existing patches are part of it) on the server.

If you cannot download zipped RU then you need to indicate all patch ids in the list during opatchauto rollback -id 29314424,29314339,29301676,28566910,26839277

As long as I have unzipped RU on rac1, I will do by the following way:

[root@rac1 ~]# cd /u01/app/sw/29301687

[root@rac1 29301687]# ll
 total 132
 drwxr-x--- 4 grid oinstall     48 Mar 25 01:09 26839277
 drwxr-x--- 4 grid oinstall     48 Mar 25 01:08 28566910
 drwxr-x--- 5 grid oinstall     62 Mar 25 01:03 29301676
 drwxr-x--- 4 grid oinstall     67 Mar 25 01:08 29314339
 drwxr-x--- 5 grid oinstall     62 Mar 25 01:06 29314424
 drwxr-x--- 2 grid oinstall   4096 Mar 25 01:03 automation
 -rw-rw-r-- 1 grid oinstall   5828 Mar 25 01:29 bundle.xml
 -rw-r--r-- 1 grid oinstall 120219 Apr 10 18:07 README.html
 -rw-r----- 1 grid oinstall      0 Mar 25 01:03 README.txt

4. Rollback patches using opatchauto:

[root@rac1 29301687]# /u01/app/12.2.0/grid/OPatch/opatchauto rollback -oh /u01/app/12.2.0/grid
 ==Following patches were SUCCESSFULLY rolled back:
 Patch: /u01/app/sw/29301687/29314424
 Log: /u01/app/12.2.0/grid/cfgtoollogs/opatchauto/core/opatch/opatch2019-05-29_12-56-19PM_1.log
 Patch: /u01/app/sw/29301687/29301676
 Log: /u01/app/12.2.0/grid/cfgtoollogs/opatchauto/core/opatch/opatch2019-05-29_12-56-19PM_1.log
 Patch: /u01/app/sw/29301687/26839277
 Log: /u01/app/12.2.0/grid/cfgtoollogs/opatchauto/core/opatch/opatch2019-05-29_12-56-19PM_1.log
 Patch: /u01/app/sw/29301687/28566910
 Log: /u01/app/12.2.0/grid/cfgtoollogs/opatchauto/core/opatch/opatch2019-05-29_12-56-19PM_1.log
 Patch: /u01/app/sw/29301687/29314339
 Log: /u01/app/12.2.0/grid/cfgtoollogs/opatchauto/core/opatch/opatch2019-05-29_12-56-19PM_1.log

5. Start database instance on the first node and shutdown on the second:

# srvctl start instance -db orclA -i orclA1
# srvctl stop instance -db orclA -i orclA2

6. Connect to the second node and repeat the same steps:

[root@rac2 ~]# cd /u01/app/sw/29301687

[root@rac2 29301687]# /u01/app/12.2.0/grid/OPatch/opatchauto rollback -oh /u01/app/12.2.0/grid

7. Start database instance on rac2

# srvctl start instance -db orclA -i orclA2

8. Check inventory

$  /u01/app/12.2.0/grid/OPatch/opatch lspatches

There are no Interim patches installed in this Oracle Home "/u01/app/12.2.0/grid".
 OPatch succeeded.

Start CRS even getting “ORA-15040: diskgroup is incomplete” on voting file/OCR diskgroup


CRS was down on both nodes, during startup cluster encountered the following error when it was trying to mount diskgroup containing voting files and OCR:

WARNING: Disk Group VOTE containing configured OCR is not mounted
WARNING: Disk Group VOTE containing voting files is not mounted
ORA-15040: diskgroup is incomplete
ORA-15042: ASM disk "0" is missing from group number "1" 

The diskgroup, where OCR and voting files were located was not able to mount because one disk was missing. As a result CRS is down:

# crsctl status res -t
CRS-4535: Cannot communicate with Cluster Ready Services
CRS-4000: Command Status failed, or completed with errors.

We know that NORMAL redundancy diskgroup can tolerate one mirror problem at a time.


1. Start HAS and check status of the local resoureces

# crsctl start has

# crsctl status res -t -init

Name          Target      State        Server      State details       
Cluster Resources
       1       ONLINE      ONLINE       rac2         STABLE
       1        ONLINE     ONLINE       rac2         STABLE
       1        OFFLINE    OFFLINE                   STABLE
       1        ONLINE      OFFLINE                  STABLE
       1        ONLINE      ONLINE       rac2        STABLE
       1        ONLINE      ONLINE       rac2        STABLE
       1        ONLINE      ONLINE       rac2        OBSERVER,STABLE
       1        OFFLINE      OFFLINE                 STABLE
       1        ONLINE      ONLINE       rac2        STABLE
       1        ONLINE      INTERMEDIATE rac2        STABLE
       1        ONLINE      ONLINE       rac2        STABLE
       1        ONLINE      ONLINE       rac2        STABLE
       1        ONLINE      ONLINE       rac2        STABLE
       1        ONLINE      OFFLINE      rac2        STABLE 

2. Connect to the ASM instance and mount diskgroup using force option.

ASM instance will be in nomount state, because diskgroup having voting files and OCR cannot be mounted.

Force option is mandatory, otherwise you will get the same ORA-15040 error.

# su - grid

$ sqlplus / as sysasm

SQL*Plus: Release Production on Tue May 28 16:14:14 2019
Copyright (c) 1982, 2016, Oracle.  All rights reserved.

Connected to:
 Oracle Database 12c Enterprise Edition Release - 64bit Production

SQL> alter diskgroup VOTE mount force;
Diskgroup altered.

This operation sometimes takes ~6min to complete because of the following notification in alert_ASM?.log

"WARNING: Background operations delayed until 05/28/19 16:19:47 because ASM was not stopped cleanly and there could be disconnected client(s)"

The error message is self explanatory.

3. The diskgroup online operation on the 2nd step should trigger clusterware autostart, if not start it using the following command:

# crsctl start cluster

4. Check CRS status:

# crsctl status res -t 

Name           Target  State        Server       State details       
Local Resources

                ONLINE  ONLINE       rac2        STABLE
                ONLINE  OFFLINE      rac2        STABLE
                ONLINE  OFFLINE      rac2        STABLE
                ONLINE  ONLINE       rac2        STABLE
                ONLINE  OFFLINE      rac2        STABLE
                ONLINE  ONLINE       rac2        STABLE
                ONLINE  OFFLINE      rac2        STABLE
                ONLINE  ONLINE       rac2        STABLE
                ONLINE  ONLINE       rac2        STABLE
                OFFLINE OFFLINE      rac2        STABLE
Cluster Resources
       1        ONLINE  ONLINE       rac2        STABLE
       1        ONLINE  ONLINE       rac2        STABLE
       1        ONLINE  ONLINE       rac2        STABLE
       1        OFFLINE OFFLINE                  STABLE
       1        ONLINE  OFFLINE                  STABLE
       2        ONLINE  ONLINE       rac2        Started,STABLE
       1        ONLINE  ONLINE       rac2        STABLE
       1        OFFLINE OFFLINE                  STABLE
       1        ONLINE  ONLINE       rac2        STABLE
       1        ONLINE  ONLINE       rac2        STABLE
       1        ONLINE  ONLINE       rac2        STABLE
       1        ONLINE  ONLINE       rac2        STABLE
       1        ONLINE  ONLINE       rac2        STABLE


Change corrupted disks as soon as possible and make it online.

ORA-12578: TNS:wallet open failed while starting the database


ORA-12578: TNS:wallet open failed encountered while starting the database using SRVCTL. Auto-login wallet doesn’t open during database startup when started using SRVCTL .

$ srvctl start database -db orcl
PRCD-1332 : failed to start database orcl
PRCR-1079 : Failed to start resource ora.orcl.db
CRS-5017: The resource action “ora.orcl.db start” encountered the following error:
ORA-01078: failure in processing system parameters
ORA-01565: error in identifying file ‘+DATA/ORCL/PARAMETERFILE/spfile.291.1001107969’
ORA-17503: ksfdopn:10 Failed to open file +DATA/ORCL/PARAMETERFILE/spfile.291.1001107969
ORA-12578: TNS:wallet open failed

There are two solutions:


Start the database in mount mode using sqlplus:

SQL> startup mount;

Open the wallet:

SQL> alter system set encryption wallet open identified by “wallet_password”;

Open the database:

SQL> alter database open;


Check the value of TNS_ADMIN value by executing:

$ srvctl getenv database -d orcl -t “TNS_ADMIN”
PRKF-1128 : Environment variable TNS_ADMIN is not defined.

Set correct TNS_ADMIN value by executing:

$ srvctl setenv database -d orcl -T “TNS_ADMIN=/u01/app/oracle/product/18.3.0/dbhome_1/network/admin”

Change the following parameter in sqlnet.ora file:





Start the database:

$ srvctl start database -db orcl

Backup best practices for Oracle Clusterware

I recommend you to backup clusterware related files after initial setup and at any change. The backup files can save you from OCR, OLR corruption during GI patch. If any of the files become corrupted you will be able to recover it in several minutes (or seconds). Depends on the failure, you may lose several hours to recover your cluster to the state it was before something happened.

Here are the steps to protect your cluster:

1. Backup ASM spfile initially and at any change.

There are several ways to backup ASM spfile using spcopy, spbackup or create pfile=<backup location> from spfile.

To locate the Oracle ASM SPFILE, use the ASMCMD spget command:

ASMCMD> spget

Copy the Oracle ASM SPFILE to the backup location:

ASMCMD> spbackup +GRID/myrac/ASMPARAMETERFILE/registry.253.974466047 /backup/spfileasm.ora

2. Backing up ASM password file once should be enough. If you change password for pwfile users or add another user into the list, then make a new backup.

Locate the password file using the ASMCMD pwget command.

ASMCMD> pwget --asm

Back up the password file to another location with the pwcopy command.

ASMCMD> pwcopy +GRID/orapwASM  /backup/orapwASM 
copying +GRID/orapwASM -> /backup/orapwASM

3. Use md_backup command to create a backup file containing metadata for one or more disk groups.

To backup metadata for all disk groups, do the following:

ASMCMD> md_backup /tmp/dgmetabackup

Disk group metadata to be backed up: DATA
Disk group metadata to be backed up: FRA
Disk group metadata to be backed up: GRID

In case you need to backup metadata only for a specific disk group, use -G option.

4. Backup OLR on each node.

If OLR is missing or corrupted, clusterware can’t be started on that node. So make manual backup initially and after any change:

Do the following on each node:

# ocrconfig -local -manualbackup

Copy generated file to the backup location:

# cp /u01/app/12.2.0/grid/cdata/rac1/backup_20180510_230359.olr /backup/

Or change default backup location to /backup before making the actual backup:

# ocrconfig -local -backuploc /backup

# ocrconfig -local -manualbackup

5. Mirror and Backup OCR.

You should configure OCR in two independent disk groups. Typically, this is the work area and the recovery area. At least two OCR locations should be configured.

# ocrconfig -add +FRA

There are automatic OCR backups that are taken in the past 4 hours, 8 hours, 12 hours, and in the last day and week.

You can also manually backup OCR before applying any patch or upgrade GI home:

# ocrconfig -manualbackup

Regularly save taken backup to another location using the following way:

Identify the latest backup (manual or automatic):

[grid@rac1 ~]$ ocrconfig -showbackup
rac1 2018/05/10 13:06:18 +GRID:/myrac/OCRBACKUP/backup00.ocr.289.975762375 830990544

Copy it to the backup location:

$ ocrconfig -copy +GRID:/myrac/OCRBACKUP/backup00.ocr.289.975762375 /backup/backup00.ocr

Or change default backup locations to another diskgroup other than GRID:

# ocrconfig -backuploc +FRA



Add filegroup fails with ORA-15067: command or option incompatible with diskgroup redundancy


I was trying to add filegroup to the FRA diskgroup:

SQL> alter diskgroup FRA add filegroup high_filegroup database orcl set ‘datafile.redundancy’ = ‘HIGH’;


ORA-15067: command or option incompatible with diskgroup redundancy


Checking diskgroup type:

SQL> select name,type,compatibility,database_compatibility from v$asm_diskgroup where name=’FRA’;

————- —— ————————– ————————————————————


Change diskgroup type to FLEX:

SQL> alter diskgroup FRA convert redundancy to flex;
Diskgroup altered.

Check that type was changed:

SQL> select name,type,compatibility,database_compatibility from v$asm_diskgroup where name=’FRA’;

————- —— ————————– ————————————————————
FRA        FLEX

Adding filegroup succeeds:

SQL> alter diskgroup FRA add filegroup high_filegroup database orcl set ‘datafile.redundancy’ = ‘HIGH’;
Diskgroup altered.

Daylight saving time support in Oracle CRS

Dear readers,

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In this post, I want to share my experience of how I solved the daylight saving time problem with Oracle CRS. With the default setup, in case timezone changes on your system, the client/application who connects to the database remotely(local/BEQ connections have correct timezone) will still have old timezone information and will enter wrong data.

Some countries,  that are not affected by daylight saving time are lucky and does not have to worry about it. But if your servers are not located in lucky countries then you must make CRS DTS aware.

During the GI installation, Oracle saves Timezone information in $CRS_HOME/crs/install/s_crsconfig_hostname_env.txt file, that makes TZ not to change for CRS even it is changed on OS level.

Please note that timezone can be changed for the database using srvctl:

srvctl setenv database -env 'TZ=time zone'

But I do not recommend to do that, because you must do the same everytime you create a new database.
Better to change TZ globally at CRS level.

In simple words just commenting out the TZ variable in¬†$CRS_HOME/crs/install/s_crsconfig_hostname_env.txt and restarting the CRS on each node just one time is enough to do that, but let’s check it.

1.  List the current timezone settings:

[root@rac1 ~]# timedatectl status|grep zone
Time zone: UTC (UTC, +0000)
[root@rac2 ~]#  timedatectl status|grep zone
Time zone: UTC (UTC, +0000)

2. Change timezone at OS level:

[root@rac1 ~]# timedatectl set-timezone Europe/Bratislava
[root@rac2 ~]# timedatectl set-timezone Europe/Bratislava

3. Check local and scan connections:

[oracle@rac1 ~]$ sqlplus / as sysdba

SQL> select to_char(sysdate,'HH24:MI:SS AM')  dbtime from dual;

18:50:05 PM     <<<<<<<<<<<<Correct , same as OS

[oracle@rac1 ~]$ sqlplus marik/123@ORCL

SQL> select to_char(sysdate,'HH24:MI:SS AM') dbtime from dual;

16:50:10 PM     <<<<<<<<<<<<Incorrect

4. Comment TZ in the config file:

[root@rac1 ~]# cat /u01/app/18.3.0/grid/crs/install/s_crsconfig_rac1_env.txt|grep TZ=
#   the appropriate time zone name. For example, TZ=America/New_York

[root@rac2 ~]# cat /u01/app/18.3.0/grid/crs/install/s_crsconfig_rac2_env.txt|grep TZ=
#   the appropriate time zone name. For example, TZ=America/New_York

5. Restart CRS on both nodes:

[root@rac1 ~]#  crsctl stop crs
[root@rac1 ~]#  crsctl start crs -wait
[root@rac2 ~]#  crsctl stop crs
[root@rac2 ~]#  crsctl start crs -wait

6. Change timezone on OS level several times and check local & scan connections:

[root@rac1 ~]# timedatectl set-timezone Africa/Conakry
[root@rac2 ~]# timedatectl set-timezone Africa/Conakry

Important: You need to reconnect to the database(so consider that sessions must be disconnected and reconnected again, old connections have old settings)

[oracle@rac1 ~]$ sqlplus / as sysdba

SQL> Select to_char(sysdate,'HH24:MI:SS AM') dbtime from dual;

17:15:56 PM <<<<<<<<<<<<Correct

[oracle@rac1 ~]$ sqlplus marik/123@ORCL

SQL> Select to_char(sysdate,'HH24:MI:SS AM') dbtime from dual;

17:15:27 PM <<<<<<<<<<<<Correct

Change one more time:

[root@rac1 ~]# timedatectl set-timezone America/Aruba
[root@rac2 ~]# timedatectl set-timezone America/Aruba

Exit connections and reconnect:

[oracle@rac1 ~]$ sqlplus / as sysdba

SQL> Select to_char(sysdate,'HH24:MI:SS AM') dbtime from dual;

13:17:47 PM <<<<<<<<<<<<Correct

[oracle@rac1 ~]$ sqlplus marik/123@ORCL

SQL> Select to_char(sysdate,'HH24:MI:SS AM') dbtime from dual;

13:17:31 PM <<<<<<<<<<<<Correct

MGTCA-1176/MGTCA-1162 : An error occurred while marking the Cluster Manifest File as expired.

If you are installing “Oracle Member Cluster for Oracle Database” and during the installation GIRM configuration assistant fails with the following error:

MGTCA-1176 : An error occurred while marking the Cluster Manifest File as expired.
MGTCA-1162 : failed to add a property to the provided Cluster Manifest File

Just give the following permission to the manifest file , to let the installer make changes there:

chmod 777 manifest.xml

There is no useful info about that on the internet and metalink! I guessed it myself.¬† That’s why posting that simple solution here.

Disable Auto Space Advisor

On our production database Segment Space Advisor jobs were running very frequently with different names “SYS.ORA$AT_SA_SPC_SY_***”.¬† That¬†was causing 100% of IO activity when was creating advise on the table containing XML files . LOB segment space for this table is 565G.

In my opinion, it is fare to disable this auto task and run manually whenever you want.

client_name => ‘auto space advisor’,
operation => NULL,
window_name => NULL);

Check the status:

SQL> select client_name, status
2 from dba_autotask_client;

auto optimizer stats collection ENABLED
auto space advisor DISABLED
sql tuning advisor DISABLED

Thanks to Fikria for this case ūüôā

Exadata: Rebuild RAC clusterware without deleting data Version 2

This post is differrent from my previous post Rebuild RAC clusterware without deleting data . Because two days ago I was upgrading grid infrastructure from 12.1 to 12.2 that was successfull on first node , but failed on second node. I will not describe why this happend, but the whole process was something complicated instead of being simple. We have installed several patches before the installation(gridSetup has this option to indicate patches before installation)… Seems the 12.2 software has many bugs even during upgrade process.(But I agree  with other DBA-s that 12.2 database is very stable itself).

So what happend now is that during first node upgrade OCR files was changed. I tried deconfigure from 12.2 home and it was also failed. So now I am with my clusterware that has corrupted OCR and voting disks(it belongs 12.2 version). In my presious post I was starting clusterware in exclusive mode with nocrs and restoring OCR from backup, but now because of voting disks are different version  it does not starting in even exclusive mode.

So I have followed the steps that recreate diskgroup , where OCR and voting disks are saved. Because it is Exadata Cell Storage disks , it was more complicated than with ordinary disks, where you can cleanup header using “dd”. Instead of dd you use cellcli.

So let’s start:

Connect to each cell server(I have three of them) and drop grid disks that belong to DBFS(it contains OCR and Voting disks). Be careful dropping griddisk causes data to be erased. So DBFS must contain only OCR and Vdisks not !DATA!

#Find the name, celldisk and size of the grid disk:

CellCLI> list griddisk where name like ‘DBFS_.*’ attributes name, cellDisk, size
DBFS_CD_02_lbcel01_dr_adm CD_02_lbcel01_dr_adm 33.796875G
DBFS_CD_03_lbcel01_dr_adm CD_03_lbcel01_dr_adm 33.796875G
DBFS_CD_04_lbcel01_dr_adm CD_04_lbcel01_dr_adm 33.796875G
DBFS_CD_05_lbcel01_dr_adm CD_05_lbcel01_dr_adm 33.796875G
DBFS_CD_06_lbcel01_dr_adm CD_06_lbcel01_dr_adm 33.796875G
DBFS_CD_07_lbcel01_dr_adm CD_07_lbcel01_dr_adm 33.796875G
DBFS_CD_08_lbcel01_dr_adm CD_08_lbcel01_dr_adm 33.796875G
DBFS_CD_09_lbcel01_dr_adm CD_09_lbcel01_dr_adm 33.796875G
DBFS_CD_10_lbcel01_dr_adm CD_10_lbcel01_dr_adm 33.796875G
DBFS_CD_11_lbcel01_dr_adm CD_11_lbcel01_dr_adm 33.796875G



CellCLI> drop griddisk DBFS_CD_02_lbcel01_dr_adm
drop griddisk DBFS_CD_03_lbcel01_dr_adm
drop griddisk DBFS_CD_04_lbcel01_dr_adm
drop griddisk DBFS_CD_05_lbcel01_dr_adm
drop griddisk DBFS_CD_06_lbcel01_dr_adm
drop griddisk DBFS_CD_07_lbcel01_dr_adm
drop griddisk DBFS_CD_08_lbcel01_dr_adm
drop griddisk DBFS_CD_09_lbcel01_dr_adm
drop griddisk DBFS_CD_10_lbcel01_dr_adm
drop griddisk DBFS_CD_11_lbcel01_dr_adm


cellcli> create griddisk DBFS_CD_02_lbcel01_dr_adm celldisk=CD_02_lbcel01_dr_adm, size=33.796875G
create griddisk DBFS_CD_03_lbcel01_dr_adm celldisk=CD_03_lbcel01_dr_adm, size=33.796875G
create griddisk DBFS_CD_04_lbcel01_dr_adm celldisk=CD_04_lbcel01_dr_adm, size=33.796875G
create griddisk DBFS_CD_05_lbcel01_dr_adm celldisk=CD_05_lbcel01_dr_adm, size=33.796875G
create griddisk DBFS_CD_06_lbcel01_dr_adm celldisk=CD_06_lbcel01_dr_adm, size=33.796875G
create griddisk DBFS_CD_07_lbcel01_dr_adm celldisk=CD_07_lbcel01_dr_adm, size=33.796875G
create griddisk DBFS_CD_08_lbcel01_dr_adm celldisk=CD_08_lbcel01_dr_adm, size=33.796875G
create griddisk DBFS_CD_09_lbcel01_dr_adm celldisk=CD_09_lbcel01_dr_adm, size=33.796875G
create griddisk DBFS_CD_10_lbcel01_dr_adm celldisk=CD_10_lbcel01_dr_adm, size=33.796875G
create griddisk DBFS_CD_11_lbcel01_dr_adm celldisk=CD_11_lbcel01_dr_adm, size=33.796875G

Do the same steps on other cells.

2.  Deconfigure on each node

# Run deconfig

/u01/app/ -deconfig -force

#rename gpnp profile

mv /u01/app/ /tmp/profile_backup.xml

3. Run on first node


It will fail because will not find the disk group DBFS for mounting and of course OCR inside.  But now asm is started in nomount mode and we are able to recreate diskgroup

4. Create DBFS diskgroup

sqlplus / as sysasm

SQL> create diskgroup DBFS
failgroup LBCEL01_DR_ADM disk ‘o/*/DBFS_CD_02_lbcel01_dr_adm’,’o/*/DBFS_CD_03_lbcel01_dr_adm’,’o/*/DBFS_CD_04_lbcel01_dr_adm’,’o/*/DBFS_CD_05_lbcel01_dr_adm’,’o/*/DBFS_CD_06_lbcel01_dr_adm’,’o/*/DBFS_CD_07_lbcel01_dr_adm’,’o/*/DBFS_CD_08_lbcel01_dr_adm’,’o/*/DBFS_CD_09_lbcel01_dr_adm’,’o/*/DBFS_CD_10_lbcel01_dr_adm’,’o/*/DBFS_CD_11_lbcel01_dr_adm’
failgroup LBCEL02_DR_ADM disk ‘o/*/DBFS_CD_02_lbcel02_dr_adm’,’o/*/DBFS_CD_03_lbcel02_dr_adm’,’o/*/DBFS_CD_04_lbcel02_dr_adm’,’o/*/DBFS_CD_05_lbcel02_dr_adm’,’o/*/DBFS_CD_06_lbcel02_dr_adm’,’o/*/DBFS_CD_07_lbcel02_dr_adm’,’o/*/DBFS_CD_08_lbcel02_dr_adm’,’o/*/DBFS_CD_09_lbcel02_dr_adm’,’o/*/DBFS_CD_10_lbcel02_dr_adm’,’o/*/DBFS_CD_11_lbcel02_dr_adm’
failgroup lbcel03_dr_adm disk ‘o/*/DBFS_CD_02_lbcel03_dr_adm’,’o/*/DBFS_CD_03_lbcel03_dr_adm’,’o/*/DBFS_CD_04_lbcel03_dr_adm’,’o/*/DBFS_CD_05_lbcel03_dr_adm’,’o/*/DBFS_CD_06_lbcel03_dr_adm’,’o/*/DBFS_CD_07_lbcel03_dr_adm’,’o/*/DBFS_CD_08_lbcel03_dr_adm’,’o/*/DBFS_CD_09_lbcel03_dr_adm’,’o/*/DBFS_CD_10_lbcel03_dr_adm’,’o/*/DBFS_CD_11_lbcel03_dr_adm’

5. Do the following steps:

* Deconfigure again from first node
* remove gpnp profile
* run again on first node

At this time should be successful.

6. Restore OCR

/u01/app/<clustername> directory contans OCR backups by default

crsctl stop crs -f
crsctl start crs -excl -nocrs
ocrconfig -restore /u01/app/
crsctl stop crs -f
crsctl start crs

7. Run on the second node