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20 February, 2017

12cR1 RAC Posts -- 6 :Running the Cluster Verification Utility

With a successful RAC Cluster, running the Cluster Verification Utility

[oracle@collabn1 ~]$ cluvfy stage -post crsinst -n collabn1,collabn2

Performing post-checks for cluster services setup

Checking node reachability...
Node reachability check passed from node "collabn1"


Checking user equivalence...
User equivalence check passed for user "oracle"

Checking node connectivity...

Checking hosts config file...

Verification of the hosts config file successful

Check: Node connectivity using interfaces on subnet "192.168.78.0"
Node connectivity passed for subnet "192.168.78.0" with node(s) collabn2,collabn1
TCP connectivity check passed for subnet "192.168.78.0"


Check: Node connectivity using interfaces on subnet "172.16.100.0"
Node connectivity passed for subnet "172.16.100.0" with node(s) collabn1,collabn2
TCP connectivity check passed for subnet "172.16.100.0"

Checking subnet mask consistency...
Subnet mask consistency check passed for subnet "192.168.78.0".
Subnet mask consistency check passed for subnet "172.16.100.0".
Subnet mask consistency check passed.

Node connectivity check passed

Checking multicast communication...

Checking subnet "172.16.100.0" for multicast communication with multicast group "224.0.0.251"...
Check of subnet "172.16.100.0" for multicast communication with multicast group "224.0.0.251" passed.

Check of multicast communication passed.

Checking whether the ASM filter driver is active and consistent on all nodes
ASM filter driver library is not installed on any of the cluster nodes.
ASM filter driver configuration was found consistent across all the cluster nodes.
Time zone consistency check passed

Checking Cluster manager integrity...


Checking CSS daemon...
Oracle Cluster Synchronization Services appear to be online.

Cluster manager integrity check passed


UDev attributes check for OCR locations started...
UDev attributes check passed for OCR locations


UDev attributes check for Voting Disk locations started...
UDev attributes check passed for Voting Disk locations

Default user file creation mask check passed

Checking cluster integrity...


Cluster integrity check passed


Checking OCR integrity...

Checking the absence of a non-clustered configuration...
All nodes free of non-clustered, local-only configurations


Checking daemon liveness...
Liveness check passed for "CRS daemon"

Checking OCR config file "/etc/oracle/ocr.loc"...

OCR config file "/etc/oracle/ocr.loc" check successful


Disk group for ocr location "+OCRVOTE/collabn-cluster/OCRFILE/registry.255.934671619" is available on all the nodes


Checking OCR backup location "/u01/app/12.1.0/grid/cdata/collabn-cluster"

OCR backup location "/u01/app/12.1.0/grid/cdata/collabn-cluster" check passed

NOTE:
This check does not verify the integrity of the OCR contents. Execute 'ocrcheck' as a privileged user to verify the contents of OCR.

OCR integrity check passed

Checking CRS integrity...

Clusterware version consistency passed.

CRS integrity check passed

Checking node application existence...

Checking existence of VIP node application (required)
VIP node application check passed

Checking existence of NETWORK node application (required)
NETWORK node application check passed

Checking existence of ONS node application (optional)
ONS node application check passed


Checking Single Client Access Name (SCAN)...

Checking TCP connectivity to SCAN listeners...
TCP connectivity to SCAN listeners exists on all cluster nodes

Checking name resolution setup for "collabn-cluster-scan.racattack"...

Checking integrity of name service switch configuration file "/etc/nsswitch.conf" ...
All nodes have same "hosts" entry defined in file "/etc/nsswitch.conf"
Check for integrity of name service switch configuration file "/etc/nsswitch.conf" passed


Checking SCAN IP addresses...
Check of SCAN IP addresses passed

Verification of SCAN VIP and listener setup passed

Checking OLR integrity...
Check of existence of OLR configuration file "/etc/oracle/olr.loc" passed
Check of attributes of OLR configuration file "/etc/oracle/olr.loc" passed

WARNING:
This check does not verify the integrity of the OLR contents. Execute 'ocrcheck -local' as a privileged user to verify the contents of OLR.

OLR integrity check passed

Checking Oracle Cluster Voting Disk configuration...

Oracle Cluster Voting Disk configuration check passed

User "oracle" is not part of "root" group. Check passed
Oracle Clusterware is installed on all nodes.
CTSS resource check passed
Query of CTSS for time offset passed

CTSS is in Active state. Proceeding with check of clock time offsets on all nodes...
Check of clock time offsets passed


Oracle Cluster Time Synchronization Services check passed
Checking VIP configuration.
Checking VIP Subnet configuration.
Check for VIP Subnet configuration passed.
Checking VIP reachability
Check for VIP reachability passed.

Post-check for cluster services setup was successful.
[oracle@collabn1 ~]$
[oracle@collabn1 ~]$ su
Password:
[root@collabn1 oracle]# 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         :   +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]#
[root@collabn1 oracle]# ocrcheck -local
Status of Oracle Local Registry is as follows :
         Version                  :          4
         Total space (kbytes)     :     409568
         Used space (kbytes)      :       1028
         Available space (kbytes) :     408540
         ID                       : 1014277103
         Device/File Name         : /u01/app/12.1.0/grid/cdata/collabn1.olr
                                    Device/File integrity check succeeded

         Local registry integrity check succeeded

         Logical corruption check succeeded

[root@collabn1 oracle]#



[root@collabn2 oracle]# ocrcheck -local
Status of Oracle Local Registry is as follows :
         Version                  :          4
         Total space (kbytes)     :     409568
         Used space (kbytes)      :        796
         Available space (kbytes) :     408772
         ID                       : 1896774486
         Device/File Name         : /u01/app/12.1.0/grid/cdata/collabn2.olr
                                    Device/File integrity check succeeded

         Local registry integrity check succeeded

         Logical corruption check succeeded

[root@collabn2 oracle]#


The "cluvfy stage -post crsinst" command as the Grid Infrastructure user checks the status of all components after the installation and configuration of the Cluster.  Note : This does not and cannot check any database (RAC or non-RAC) that is created.

The "ocrcheck" commands by root are to check the integrity of the Cluster Registry and Local Registry.  (You would run "ocrcheck -local" on each node of the Cluster).

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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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22 January, 2017

12cR1 RAC Posts -- 4 : Adding a Disk of a different size

How does 12.1.0.2 ASM handle adding a disk of a different size to an existing DiskGroup ?

I currently have 4 disks of 5GB each in 2 DiskGroups

[oracle@collabn1 ~]$ sqlplus / as sysasm

SQL*Plus: Release 12.1.0.2.0 Production on Sat Jan 21 23:48:00 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> select group_number, disk_number, name, state, total_mb
  2  from v$asm_disk
  3  order by 1,2,3
  4  /

GROUP_NUMBER DISK_NUMBER NAME                           STATE      TOTAL_MB
------------ ----------- ------------------------------ -------- ----------
           0           0                                NORMAL            0
           1           0 DATA_0000                      NORMAL         5114
           1           1 DATA_0001                      NORMAL         5114
           2           0 FRA_0000                       NORMAL         5114

SQL>
SQL> select group_number, name
  2  from v$asm_diskgroup
  3  order by 1
  4  /

GROUP_NUMBER NAME
------------ ------------------------------
           1 DATA
           2 FRA

SQL>


The DATA DiskGroup has 2 disks of 5GB each and the FRA DiskGroup has 1 disk of 5GB.  One disk (identified as DiskNumber=0) is not yet assigned.

What happens if I try to expand the DATA DiskGroup with a Disk of 10GB ?

[root@collabn1 dev]# fdisk /dev/sdf
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0xff8b0ab7.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
         switch off the mode (command 'c') and change display units to
         sectors (command 'u').

Command (m for help): m
Command action
   a   toggle a bootable flag
   b   edit bsd disklabel
   c   toggle the dos compatibility flag
   d   delete a partition
   l   list known partition types
   m   print this menu
   n   add a new partition
   o   create a new empty DOS partition table
   p   print the partition table
   q   quit without saving changes
   s   create a new empty Sun disklabel
   t   change a partition's system id
   u   change display/entry units
   v   verify the partition table
   w   write table to disk and exit
   x   extra functionality (experts only)

Command (m for help): p

Disk /dev/sdf: 12.9 GB, 12884901888 bytes
255 heads, 63 sectors/track, 1566 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xff8b0ab7

   Device Boot      Start         End      Blocks   Id  System

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-1566, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-1566, default 1566):
Using default value 1566

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.
[root@collabn1 dev]#
[root@collabn1 dev]# /sbin/scsi_id -g -u -d /dev/sdf
1ATA_VBOX_HARDDISK_VB535deca9-9a295efe
[root@collabn1 dev]#
[root@collabn1 dev]# cd /etc/udev/rules.d
[root@collabn1 rules.d]# vi 99-oracle-asmdevices.rules
[root@collabn1 rules.d]# tail -1 99-oracle-asmdevices.rules
KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id -g -u -d /dev/$parent",  RESULT=="1ATA_VBOX_HARDDISK_VB535deca9-9a295efe", NAME="asm-disk5", OWNER="oracle", GROUP="dba", MODE="0660"
[root@collabn1 rules.d]#
[root@collabn1 rules.d]# /sbin/partprobe /dev/sdf1
[root@collabn1 rules.d]# /sbin/udevadm test /block/sdb/sdf1
run_command: calling: test
udevadm_test: version 147
This program is for debugging only, it does not run any program,
specified by a RUN key. It may show incorrect results, because
some values may be different, or not available at a simulation run.

parse_file: reading '/lib/udev/rules.d/10-console.rules' as rules file
parse_file: reading '/lib/udev/rules.d/10-dm.rules' as rules file
parse_file: reading '/lib/udev/rules.d/11-dm-lvm.rules' as rules file
parse_file: reading '/lib/udev/rules.d/13-dm-disk.rules' as rules file
parse_file: reading '/lib/udev/rules.d/40-isdn.rules' as rules file
parse_file: reading '/lib/udev/rules.d/40-redhat.rules' as rules file
parse_file: reading '/lib/udev/rules.d/42-qemu-usb.rules' as rules file
parse_file: reading '/lib/udev/rules.d/50-firmware.rules' as rules file
parse_file: reading '/lib/udev/rules.d/50-udev-default.rules' as rules file
parse_file: reading '/etc/udev/rules.d/55-usm.rules' as rules file
parse_file: reading '/lib/udev/rules.d/60-alias-kmsg.rules' as rules file
parse_file: reading '/lib/udev/rules.d/60-cdrom_id.rules' as rules file
parse_file: reading '/etc/udev/rules.d/60-fprint-autosuspend.rules' as rules file
parse_file: reading '/lib/udev/rules.d/60-net.rules' as rules file
parse_file: reading '/etc/udev/rules.d/60-pcmcia.rules' as rules file
parse_file: reading '/lib/udev/rules.d/60-persistent-alsa.rules' as rules file
parse_file: reading '/lib/udev/rules.d/60-persistent-input.rules' as rules file
parse_file: reading '/lib/udev/rules.d/60-persistent-serial.rules' as rules file
parse_file: reading '/lib/udev/rules.d/60-persistent-storage-tape.rules' as rules file
parse_file: reading '/lib/udev/rules.d/60-persistent-storage.rules' as rules file
parse_file: reading '/lib/udev/rules.d/60-persistent-v4l.rules' as rules file
parse_file: reading '/etc/udev/rules.d/60-raw.rules' as rules file
parse_file: reading '/etc/udev/rules.d/60-vboxadd.rules' as rules file
parse_file: reading '/lib/udev/rules.d/61-mobile-action.rules' as rules file
parse_file: reading '/lib/udev/rules.d/61-option-modem-modeswitch.rules' as rules file
parse_file: reading '/lib/udev/rules.d/61-persistent-storage-edd.rules' as rules file
parse_file: reading '/lib/udev/rules.d/64-device-mapper.rules' as rules file
parse_file: reading '/lib/udev/rules.d/64-md-raid.rules' as rules file
parse_file: reading '/lib/udev/rules.d/65-md-incremental.rules' as rules file
parse_file: reading '/lib/udev/rules.d/69-dm-lvm-metad.rules' as rules file
parse_file: reading '/lib/udev/rules.d/70-acl.rules' as rules file
parse_file: reading '/lib/udev/rules.d/70-cups-libusb.rules' as rules file
parse_file: reading '/lib/udev/rules.d/70-hid2hci.rules' as rules file
parse_file: reading '/etc/udev/rules.d/70-persistent-cd.rules' as rules file
parse_file: reading '/etc/udev/rules.d/70-persistent-net.rules' as rules file
parse_file: reading '/lib/udev/rules.d/71-biosdevname.rules' as rules file
parse_file: reading '/lib/udev/rules.d/75-cd-aliases-generator.rules' as rules file
parse_file: reading '/lib/udev/rules.d/75-net-description.rules' as rules file
parse_file: reading '/lib/udev/rules.d/75-persistent-net-generator.rules' as rules file
parse_file: reading '/lib/udev/rules.d/75-tty-description.rules' as rules file
parse_file: reading '/lib/udev/rules.d/78-sound-card.rules' as rules file
parse_file: reading '/lib/udev/rules.d/79-fstab_import.rules' as rules file
parse_file: reading '/lib/udev/rules.d/80-drivers.rules' as rules file
parse_file: reading '/lib/udev/rules.d/80-iosched.rules' as rules file
parse_file: reading '/lib/udev/rules.d/80-mpath-iosched.rules' as rules file
parse_file: reading '/lib/udev/rules.d/85-regulatory.rules' as rules file
parse_file: reading '/lib/udev/rules.d/88-clock.rules' as rules file
parse_file: reading '/lib/udev/rules.d/89-microcode.rules' as rules file
parse_file: reading '/etc/udev/rules.d/90-alsa.rules' as rules file
parse_file: reading '/lib/udev/rules.d/90-btrfs.rules' as rules file
parse_file: reading '/etc/udev/rules.d/90-hal.rules' as rules file
parse_file: reading '/lib/udev/rules.d/91-drm-modeset.rules' as rules file
parse_file: reading '/lib/udev/rules.d/95-dm-notify.rules' as rules file
parse_file: reading '/lib/udev/rules.d/95-keyboard-force-release.rules' as rules file
parse_file: reading '/lib/udev/rules.d/95-keymap.rules' as rules file
parse_file: reading '/lib/udev/rules.d/95-udev-late.rules' as rules file
parse_file: reading '/etc/udev/rules.d/98-kexec.rules' as rules file
parse_file: reading '/etc/udev/rules.d/99-oracle-asmdevices.rules' as rules file
parse_file: reading '/dev/.udev/rules.d/99-root.rules' as rules file
udev_rules_new: rules use 32448 bytes tokens (2704 * 12 bytes), 19085 bytes buffer
udev_rules_new: temporary index used 19500 bytes (975 * 20 bytes)
unable to open device '/sys/block/sdb/sdf1'
[root@collabn1 rules.d]#
[root@collabn1 rules.d]# /sbin/udevadm control --reload-rules
[root@collabn1 rules.d]# /sbin/start_udev
Starting udev:                                             [  OK  ]
[root@collabn1 rules.d]# 
[root@collabn1 rules.d]# ls -l /dev/asm*
brw-rw----. 1 oracle dba 8, 17 Jan 22 00:07 /dev/asm-disk1
brw-rw----. 1 oracle dba 8, 33 Jan 22 00:07 /dev/asm-disk2
brw-rw----. 1 oracle dba 8, 49 Jan 22 00:07 /dev/asm-disk3
brw-rw----. 1 oracle dba 8, 65 Jan 22 00:05 /dev/asm-disk4
brw-rw----. 1 oracle dba 8, 81 Jan 22 00:05 /dev/asm-disk5


So I now have asm-disk5 as the new ASM Disk.  Let my try to add this disk.

SQL> set pages600
SQL> select group_number, disk_number, name, path, total_mb
  2  from v$asm_disk
  3  order by 1,2
  4  /

GROUP_NUMBER DISK_NUMBER NAME
------------ ----------- ------------------------------
PATH
--------------------------------------------------------------------------------
  TOTAL_MB
----------
           0           0
/dev/asm-disk5
         0

           0           1
/dev/asm-disk4
         0

           1           0 DATA_0000
/dev/asm-disk1
      5114

           1           1 DATA_0001
/dev/asm-disk2
      5114

           2           0 FRA_0000
/dev/asm-disk3
      5114


SQL>
SQL> alter diskgroup data add disk '/dev/asm-disk5';

Diskgroup altered.

SQL>
SQL> select group_number, name, total_mb
  2  from v$asm_diskgroup
  3  order by 1,2
  4  /

GROUP_NUMBER NAME                             TOTAL_MB
------------ ------------------------------ ----------
           1 DATA                                22512
           2 FRA                                  5114

SQL>
SQL> select group_number, name, type
  2  from v$asm_diskgroup
  3  order by 1,2
  4  /

GROUP_NUMBER NAME                           TYPE
------------ ------------------------------ ------
           1 DATA                           EXTERN
           2 FRA                            EXTERN

SQL>
SQL> select group_number, name, compatibility, database_compatibility
  2  from v$asm_diskgroup
  3  order by 1
  4  /

GROUP_NUMBER NAME
------------ ------------------------------
COMPATIBILITY
------------------------------------------------------------
DATABASE_COMPATIBILITY
------------------------------------------------------------
           1 DATA
12.1.0.0.0
10.1.0.0.0

           2 FRA
12.1.0.0.0
10.1.0.0.0


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

GROUP_NUMBER DISK_NUMBER NAME
------------ ----------- ------------------------------
PATH
--------------------------------------------------------------------------------
  TOTAL_MB
----------
           0           0
/dev/asm-disk4
         0

           1           0 DATA_0000
/dev/asm-disk1
      5114

           1           1 DATA_0001
/dev/asm-disk2
      5114

           1           2 DATA_0002
/dev/asm-disk5
     12284

           2           0 FRA_0000
/dev/asm-disk3
      5114


SQL>


According to Oracle Support Document 1938950.1, adding a disk of a different size to an existing DiskGroup fails with an error ORA-15410 in 12.1.0.2.  However, that seems to apply to NORMAL or HIGH Redundancy and COMPATIBLE.ASM 12.1.0.2.   Here, I have EXTERNAL Redundancy and COMPATIBLE.ASM 12.1.0.0.0

Do I recommend Disks of different sizes ?  Absolutely *not* in Production.  This is a "play" environment in Virtual Machines on my desktop that I can destroy and recreate anytime.  I can monitor disk usage as well.
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