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30 January, 2017

12cR1 RAC Posts -- 5 : Relocating OCR and VoteDisk

Most default installation guides for Grid Infrastructure will have you creating a DATA Disk Group during the install.  This results in the OCR, the Vote Disk and MGMTDB being created in the same DATA Disk Group.

The proper installation is to have OCR and Vote Disk separated from DATA.  If you create a different Disk Group during the installation, you would have all three components (MGMTDB is new in 12c, did not exist in 11g) and you can have these components properly placed in a non-DATA Disk Group that you create as the default.

But what if they have already been located in DATA ?  Can you relocate them to another Disk Group ?



I start with creating a new Disk Group called OCRVOTE on an existing unused ASM Disk.

[root@collabn1 ~]# su - oracle
[oracle@collabn1 ~]$ . oraenv
ORACLE_SID = [oracle] ? +ASM1
The Oracle base has been set to /u01/app/oracle
[oracle@collabn1 ~]$ sqlplus '/ as sysasm'

SQL*Plus: Release 12.1.0.2.0 Production on Mon Jan 30 22:34:38 2017

Copyright (c) 1982, 2014, Oracle.  All rights reserved.


Connected to:
Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Real Application Clusters and Automatic Storage Management options

SQL>
SQL> set pages600
SQL> col name format a12
SQL> col path format a16
SQL> select name, path, state, group_number, disk_number
  2  from v$asm_disk
  3  order by 4,5,1
  4  /

NAME         PATH             STATE    GROUP_NUMBER DISK_NUMBER
------------ ---------------- -------- ------------ -----------
             /dev/asm-disk4   NORMAL              0           0
DATA_0000    /dev/asm-disk1   NORMAL              1           0
DATA_0001    /dev/asm-disk2   NORMAL              1           1
DATA_0002    /dev/asm-disk5   NORMAL              1           2
FRA_0000     /dev/asm-disk3   NORMAL              2           0

SQL>
SQL> create diskgroup OCRVOTE external redundancy disk '/dev/asm-disk4';

Diskgroup created.

SQL>
SQL> select name, path, state, group_number, disk_number
  2  from v$asm_disk
  3  order by 4,5,1
  4  /

NAME         PATH             STATE    GROUP_NUMBER DISK_NUMBER
------------ ---------------- -------- ------------ -----------
DATA_0000    /dev/asm-disk1   NORMAL              1           0
DATA_0001    /dev/asm-disk2   NORMAL              1           1
DATA_0002    /dev/asm-disk5   NORMAL              1           2
FRA_0000     /dev/asm-disk3   NORMAL              2           0
OCRVOTE_0000 /dev/asm-disk4   NORMAL              3           0

SQL>
SQL> alter diskgroup OCRVOTE set attribute 'COMPATIBLE.ASM' = '12.1';

Diskgroup altered.

SQL>


I have identified the ASM Disk on /dev/asm-disk4 as available and created a DiskGroup on it.  I have to mount the DiskGroup on the second node as well.  (If I don't mount the DiskGroup on the second node collabn2, I get errors
"PROT-30: The Oracle Cluster Registry location to be added is not usable
PROC-50: The Oracle Cluster Registry location to be added is inaccessible on nodes collabn2."
when attempting to add the OCR on the DiskGroup).

[oracle@collabn2 trace]$ sqlplus

SQL*Plus: Release 12.1.0.2.0 Production on Mon Jan 30 22:52:18 2017

Copyright (c) 1982, 2014, Oracle.  All rights reserved.

Enter user-name: / as sysasm

Connected to:
Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Real Application Clusters and Automatic Storage Management options

SQL> alter diskgroup OCRVOTE mount;

Diskgroup altered.

SQL> set pages60
SQL> col name format a12
SQL> col path format a16
SQL> select name, path, state, group_number, disk_number
  2  from v$asm_disk
  3  order by 4,5,1
  4  /

NAME         PATH             STATE    GROUP_NUMBER DISK_NUMBER
------------ ---------------- -------- ------------ -----------
DATA_0000    /dev/asm-disk1   NORMAL              1           0
DATA_0001    /dev/asm-disk2   NORMAL              1           1
DATA_0002    /dev/asm-disk5   NORMAL              1           2
FRA_0000     /dev/asm-disk3   NORMAL              2           0
OCRVOTE_0000 /dev/asm-disk4   NORMAL              3           0

SQL>


Next, I plan to relocate the OCR which is currently in the DATA DiskGroup.

SQL> exit
Disconnected from Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Real Application Clusters and Automatic Storage Management options
[oracle@collabn1 ~]$ ocrcheck
Status of Oracle Cluster Registry is as follows :
         Version                  :          4
         Total space (kbytes)     :     409568
         Used space (kbytes)      :       1688
         Available space (kbytes) :     407880
         ID                       :  827167720
         Device/File Name         :      +DATA
                                    Device/File integrity check succeeded

                                    Device/File not configured

                                    Device/File not configured

                                    Device/File not configured

                                    Device/File not configured

         Cluster registry integrity check succeeded

         Logical corruption check bypassed due to non-privileged user

[oracle@collabn1 ~]$
[oracle@collabn1 ~]$ su
Password:
[root@collabn1 oracle]# ocrconfig -add +OCRVOTE
[root@collabn1 oracle]# ocrcheck
Status of Oracle Cluster Registry is as follows :
         Version                  :          4
         Total space (kbytes)     :     409568
         Used space (kbytes)      :       1684
         Available space (kbytes) :     407884
         ID                       :  827167720
         Device/File Name         :      +DATA
                                    Device/File integrity check succeeded
         Device/File Name         :   +OCRVOTE
                                    Device/File integrity check succeeded

                                    Device/File not configured

                                    Device/File not configured

                                    Device/File not configured

         Cluster registry integrity check succeeded

         Logical corruption check succeeded

[root@collabn1 oracle]# ocrconfig -delete +DATA
[root@collabn1 oracle]# ocrcheck
Status of Oracle Cluster Registry is as follows :
         Version                  :          4
         Total space (kbytes)     :     409568
         Used space (kbytes)      :       1684
         Available space (kbytes) :     407884
         ID                       :  827167720
         Device/File Name         :   +OCRVOTE
                                    Device/File integrity check succeeded

                                    Device/File not configured

                                    Device/File not configured

                                    Device/File not configured

                                    Device/File not configured

         Cluster registry integrity check succeeded

         Logical corruption check succeeded

[root@collabn1 oracle]#


I first used OCRCHECK ("ocrcheck" at the commandline) to list the existing OCR location.  I then used root and OCRCONFIG -ADD to add +OCRVOTE as a location and verified it with OCRCHECK.  I then used OCRCONFIG -DELETE ("ocrconfig -add" and "ocrconfig -delete") to delete the old location.

I could have used "ocrconfig -replace" to replace the OCR location but I prefer ADD and DELETE.



How do I relocate the VoteDisk ?  Since I am using a single DiskGroup and External Redundancy with only 1 Failure Group, I have only 1 VoteDisk.

[root@collabn1 oracle]# crsctl query css votedisk
##  STATE    File Universal Id                File Name Disk group
--  -----    -----------------                --------- ---------
 1. ONLINE   96fbcb40bfeb4ff7bf18881adcfef149 (/dev/asm-disk1) [DATA]
Located 1 voting disk(s).
[root@collabn1 oracle]#
[root@collabn1 oracle]# crsctl replace votedisk +OCRVOTE
Successful addition of voting disk a58b8b9d58064fb8bf6df0b3ee701e32.
Successful deletion of voting disk 96fbcb40bfeb4ff7bf18881adcfef149.
Successfully replaced voting disk group with +OCRVOTE.
CRS-4266: Voting file(s) successfully replaced
[root@collabn1 oracle]#
[root@collabn1 oracle]# crsctl query css votedisk
##  STATE    File Universal Id                File Name Disk group
--  -----    -----------------                --------- ---------
 1. ONLINE   a58b8b9d58064fb8bf6df0b3ee701e32 (/dev/asm-disk4) [OCRVOTE]
Located 1 voting disk(s).
[root@collabn1 oracle]#


With ASM as  the location for VoteDisk, I cannot use CRSCTL ADD VOTEDISK  but have to use CRSCTL REPLACE VOTEDISK.

So, I have added a new DiskGroup called OCRVOTE and relocated both OCR and VoteDisk to this new DiskGroup (on disk /dev/asm-disk4).

Can I relocate +MGMTDB ?  I am open to suggestions.

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1 comment:

erpcharan said...

Nice one to read about and good points were stated in the blog

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