Hands on practice ASM

Today I want to share with you an ASM exercise which includes how to add an additional disk to our VM RAC nodes, prepare the disk, add the disk to ASM configuration and create a new diskgroup using this disk.

The very first step is to have our VM machines turned off. Then go into your VM host server’s terminal and get into ASM shared disks location.

alfredo@alfredo-N56VM:~$ cd /u04

alfredo@alfredo-N56VM:/u04$ ls

VirtualBox

alfredo@alfredo-N56VM:/u04$ cd VirtualBox/

alfredo@alfredo-N56VM:/u04/VirtualBox$ ls

ol5-112-rac

alfredo@alfredo-N56VM:/u04/VirtualBox$ cd ol5-112-rac/

alfredo@alfredo-N56VM:/u04/VirtualBox/ol5-112-rac$ ls

asm1.vdi asm2.vdi asm3.vdi asm4.vdi


Then create the new VM shared disk and assign it to your VM machines.

alfredo@alfredo-N56VM:/u04/VirtualBox/ol5-112-rac$ VBoxManage createhd --filename asm5.vdi --size 1024 --format VDI --variant Fixed

0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%

Disk image created. UUID: f317a4fb-d132-49fa-8572-76ca7a509e04

alfredo@alfredo-N56VM:/u04/VirtualBox/ol5-112-rac$ VBoxManage storageattach ol5-112-rac1 --storagectl "SATA" --port 5 --device 0 --type hdd --medium asm5.vdi --mtype shareable

alfredo@alfredo-N56VM:/u04/VirtualBox/ol5-112-rac$ VBoxManage modifyhd asm5.vdi --type shareable

alfredo@alfredo-N56VM:/u04/VirtualBox/ol5-112-rac$ VBoxManage storageattach ol5-112-rac2 --storagectl "SATA" --port 5 --device 0 --type hdd --medium asm5.vdi --mtype shareable

alfredo@alfredo-N56VM:/u04/VirtualBox/ol5-112-rac$ VBoxManage modifyhd asm5.vdi --type shareable


Now turn your on your node 1, open a terminal as root and format the disk.

[oracle@ol5-112-rac1 ~]$ su -
Password:
[root@ol5-112-rac1 ~]# cd /dev
[root@ol5-112-rac1 dev]# ls sd*
sda sda1 sda2 sdb sdb1 sdc sdc1 sdd sdd1 sde sde1 sdf sdf1 sdg sdg1 sdh
[root@ol5-112-rac1 dev]# fdisk /dev/sdh
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel. 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)

Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-130, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-130, default 130):
Using default value 130

Command (m for help): p

Disk /dev/sdh: 1073 MB, 1073741824 bytes
255 heads, 63 sectors/track, 130 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdh1 1 130 1044193+ 83 Linux

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

Calling ioctl() to re-read partition table.
Syncing disks.


Turn on the second VM node.
The next step is to add the newly partitioned disk to ASM.

[root@ol5-112-rac1 dev]# /usr/sbin/oracleasm listdisks
DISK1
DISK2
DISK3
DISK4
[root@ol5-112-rac1 dev]# /usr/sbin/oracleasm createdisk DISK5 /dev/sdh1
Writing disk header: done
Instantiating disk: done
[root@ol5-112-rac1 dev]# /usr/sbin/oracleasm listdisks
DISK1
DISK2
DISK3
DISK4
DISK5
[root@ol5-112-rac1 dev]# exit



At this point the new disk is already added to ASM configuration; let’s login to ASM instance and confirm that new disk is present.

[oracle@ol5-112-rac2 ~]$ . oraenv
ORACLE_SID = [RAC2] ? +ASM2
The Oracle base for ORACLE_HOME=/u01/app/11.2.0/grid is /u01/app/oracle
[oracle@ol5-112-rac2 ~]$ crsctl status resource -t
--------------------------------------------------------------------------------
NAME TARGET STATE SERVER STATE_DETAILS
--------------------------------------------------------------------------------
Local Resources
--------------------------------------------------------------------------------
ora.DATA.dg
ONLINE ONLINE ol5-112-rac1
ONLINE ONLINE ol5-112-rac2
ora.LISTENER.lsnr
ONLINE ONLINE ol5-112-rac1
ONLINE ONLINE ol5-112-rac2
ora.asm
ONLINE ONLINE ol5-112-rac1
ONLINE ONLINE ol5-112-rac2 Started
ora.eons
ONLINE ONLINE ol5-112-rac1
ONLINE ONLINE ol5-112-rac2
ora.gsd
OFFLINE OFFLINE ol5-112-rac1
OFFLINE OFFLINE ol5-112-rac2
ora.net1.network
ONLINE ONLINE ol5-112-rac1
ONLINE ONLINE ol5-112-rac2
ora.ons
ONLINE ONLINE ol5-112-rac1
ONLINE ONLINE ol5-112-rac2
--------------------------------------------------------------------------------
Cluster Resources
--------------------------------------------------------------------------------
ora.LISTENER_SCAN1.lsnr
1 ONLINE ONLINE ol5-112-rac1
ora.oc4j
1 OFFLINE OFFLINE
ora.ol5-112-rac1.vip
1 ONLINE ONLINE ol5-112-rac1
ora.ol5-112-rac2.vip
1 ONLINE ONLINE ol5-112-rac2
ora.rac.db
1 ONLINE ONLINE ol5-112-rac2 Open
2 ONLINE ONLINE ol5-112-rac1
ora.rac.reports.svc
1 ONLINE ONLINE ol5-112-rac1
ora.scan1.vip
1 ONLINE ONLINE ol5-112-rac1
[oracle@ol5-112-rac2 ~]$ sqlplus / as sysasm


SQL*Plus: Release 11.2.0.1.0 Production on Sun Jun 9 16:06:27 2013

Copyright (c) 1982, 2009, Oracle. All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
With the Real Application Clusters and Automatic Storage Management options

SQL> set lines 1000
SQL> column path format a50
SQL> SELECT PATH,NAME,GROUP_NUMBER,DISK_NUMBER,MOUNT_STATUS,HEADER_STATUS,MODE_STATUS,STATE,REDUNDANCY,OS_MB,TOTAL_MB,FREE_MB FROM V$ASM_DISK;

PATH NAME GROUP_NUMBER DISK_NUMBER MOUNT_S HEADER_STATU MODE_ST STATE REDUNDA OS_MB TOTAL_MB FREE_MB
-------------------------------------------------- ------------------------------ ------------ ----------- ------- ------------ ------- -------- ------- ---------- ---------- ----------
/dev/oracleasm/disks/DISK5 0 0 CLOSED PROVISIONED ONLINE NORMAL UNKNOWN 1019 0 0
/dev/oracleasm/disks/DISK4 DATA_0003 1 3 CACHED MEMBER ONLINE NORMAL UNKNOWN 5114 5114 4439
/dev/oracleasm/disks/DISK3 DATA_0002 1 2 CACHED MEMBER ONLINE NORMAL UNKNOWN 5114 5114 4439
/dev/oracleasm/disks/DISK2 DATA_0001 1 1 CACHED MEMBER ONLINE NORMAL UNKNOWN 5114 5114 4444
/dev/oracleasm/disks/DISK1 DATA_0000 1 0 CACHED MEMBER ONLINE NORMAL UNKNOWN 5114 5114 4406



You can see the DISK5 present in the ASM system view, the HEADER_STATUS is ‘PROVISIONED’. The PROVISIONED status implies that an additional platform-specific action has been taken by an administrator to make the disk available for ASM.

Now, let’s drop DISK4 from DATA diskgroup, this will free DISK4 for our new configuration.

SQL> select * from V$ASM_DISKGROUP;

GROUP_NUMBER NAME SECTOR_SIZE BLOCK_SIZE ALLOCATION_UNIT_SIZE STATE TYPE TOTAL_MB FREE_MB HOT_USED_MB COLD_USED_MB REQUIRED_MIRROR_FREE_MB USABLE_FILE_MB OFFLINE_DISKS COMPATIBILITY DATABASE_COMPATIBILITY V
------------ ------------------------------ ----------- ---------- -------------------- ----------- ------ ---------- ---------- ----------- ------------ ----------------------- -------------- ------------- ------------------------------------------------------------ ------------------------------------------------------------ -
1 DATA 512 4096 1048576 MOUNTED EXTERN 20456 17728 0 2728 0 17728 0 11.2.0.0.0 10.1.0.0.0 N



SQL> ALTER DISKGROUP DATA DROP DISK DATA_0003;

Diskgroup altered.

SQL> SELECT PATH,NAME,GROUP_NUMBER,DISK_NUMBER,MOUNT_STATUS,HEADER_STATUS,MODE_STATUS,STATE,REDUNDANCY,OS_MB,TOTAL_MB,FREE_MB FROM V$ASM_DISK;

PATH NAME GROUP_NUMBER DISK_NUMBER MOUNT_S HEADER_STATU MODE_ST STATE REDUNDA OS_MB TOTAL_MB FREE_MB
-------------------------------------------------- ------------------------------ ------------ ----------- ------- ------------ ------- -------- ------- ---------- ---------- ----------
/dev/oracleasm/disks/DISK5 0 0 CLOSED PROVISIONED ONLINE NORMAL UNKNOWN 1019 0 0
/dev/oracleasm/disks/DISK4 DATA_0003 1 3 CACHED MEMBER ONLINE DROPPING UNKNOWN 5114 5114 4546
/dev/oracleasm/disks/DISK3 DATA_0002 1 2 CACHED MEMBER ONLINE NORMAL UNKNOWN 5114 5114 4404
/dev/oracleasm/disks/DISK2 DATA_0001 1 1 CACHED MEMBER ONLINE NORMAL UNKNOWN 5114 5114 4409
/dev/oracleasm/disks/DISK1 DATA_0000 1 0 CACHED MEMBER ONLINE NORMAL UNKNOWN 5114 5114 4369


You can see the STATE of DISK4 is DROPPING, in this stage ASM will rebalance all the data from DISK4 into the disk of diskgroup DATA. In order to speed this operation we are going to modify the rebalance power of the diskgroup.

SQL> ALTER DISKGROUP DATA REBALANCE POWER 5;

Diskgroup altered.

SQL> SELECT PATH,NAME,GROUP_NUMBER,DISK_NUMBER,MOUNT_STATUS,HEADER_STATUS,MODE_STATUS,STATE,REDUNDANCY,OS_MB,TOTAL_MB,FREE_MB FROM V$ASM_DISK;


PATH NAME GROUP_NUMBER DISK_NUMBER MOUNT_S HEADER_STATU MODE_ST STATE REDUNDA OS_MB TOTAL_MB FREE_MB
-------------------------------------------------- ------------------------------ ------------ ----------- ------- ------------ ------- -------- ------- ---------- ---------- ----------
/dev/oracleasm/disks/DISK5 0 0 CLOSED PROVISIONED ONLINE NORMAL UNKNOWN 1019 0 0
/dev/oracleasm/disks/DISK4 0 1 CLOSED FORMER ONLINE NORMAL UNKNOWN 5114 0 0
/dev/oracleasm/disks/DISK3 DATA_0002 1 2 CACHED MEMBER ONLINE NORMAL UNKNOWN 5114 5114 4213
/dev/oracleasm/disks/DISK2 DATA_0001 1 1 CACHED MEMBER ONLINE NORMAL UNKNOWN 5114 5114 4218
/dev/oracleasm/disks/DISK1 DATA_0000 1 0 CACHED MEMBER ONLINE NORMAL UNKNOWN 5114 5114 4185

SQL> show parameter power

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
asm_power_limit integer 1
SQL> ALTER DISKGROUP DATA REBALANCE POWER 1;

Diskgroup altered.


After modifying the rebalance power to 5 ASM will provide more resources to the rebalance process, this results in faster rebalance times. You can see that DISK4’s header status is now ‘FORMER’ this means a disk was once part of a disk group but has been dropped cleanly from the group. It may be added to a new disk group with the ALTER DISKGROUP statement.

Be sure to modify back the power of the disk group DATA to 1.

Now let’s create a new disk group named FRA using DISK4 & DISK5.

SQL> CREATE DISKGROUP FRA EXTERNAL REDUNDANCY DISK '/dev/oracleasm/disks/DISK4' NAME FRA_0000, '/dev/oracleasm/disks/DISK5' NAME FRA_0001;

Diskgroup created.

SQL> SELECT PATH,NAME,GROUP_NUMBER,DISK_NUMBER,MOUNT_STATUS,HEADER_STATUS,MODE_STATUS,STATE,REDUNDANCY,OS_MB,TOTAL_MB,FREE_MB FROM V$ASM_DISK;

PATH NAME GROUP_NUMBER DISK_NUMBER MOUNT_S HEADER_STATU MODE_ST STATE REDUNDA OS_MB TOTAL_MB FREE_MB
-------------------------------------------------- ------------------------------ ------------ ----------- ------- ------------ ------- -------- ------- ---------- ---------- ----------
/dev/oracleasm/disks/DISK4 FRA_0000 2 0 CACHED MEMBER ONLINE NORMAL UNKNOWN 5114 5114 5072
/dev/oracleasm/disks/DISK3 DATA_0002 1 2 CACHED MEMBER ONLINE NORMAL UNKNOWN 5114 5114 4215
/dev/oracleasm/disks/DISK2 DATA_0001 1 1 CACHED MEMBER ONLINE NORMAL UNKNOWN 5114 5114 4218
/dev/oracleasm/disks/DISK1 DATA_0000 1 0 CACHED MEMBER ONLINE NORMAL UNKNOWN 5114 5114 4183
/dev/oracleasm/disks/DISK5 FRA_0001 2 1 CACHED MEMBER ONLINE NORMAL UNKNOWN 1019 1019 1009

SQL> select * from V$ASM_DISKGROUP;

GROUP_NUMBER NAME SECTOR_SIZE BLOCK_SIZE ALLOCATION_UNIT_SIZE STATE TYPE TOTAL_MB FREE_MB HOT_USED_MB COLD_USED_MB REQUIRED_MIRROR_FREE_MB USABLE_FILE_MB OFFLINE_DISKS COMPATIBILITY DATABASE_COMPATIBILITY V
------------ ------------------------------ ----------- ---------- -------------------- ----------- ------ ---------- ---------- ----------- ------------ ----------------------- -------------- ------------- ------------------------------------------------------------ ------------------------------------------------------------ -
1 DATA 512 4096 1048576 MOUNTED EXTERN 15342 12616 0 2726 0 12616 0 11.2.0.0.0 10.1.0.0.0 N
2 FRA 512 4096 1048576 MOUNTED EXTERN 6133 6081 0 52 0 6081 0 10.1.0.0.0 10.1.0.0.0 N

SQL>

ALTER DISKGROUP FRA SET ATTRIBUTE 'compatible.asm'='11.2.0.0.0';

SQL> ALTER DISKGROUP FRA SET ATTRIBUTE 'compatible.asm'='11.2.0.0.0';

Diskgroup altered.

SQL> select * from V$ASM_DISKGROUP;

GROUP_NUMBER NAME SECTOR_SIZE BLOCK_SIZE ALLOCATION_UNIT_SIZE STATE TYPE TOTAL_MB FREE_MB HOT_USED_MB COLD_USED_MB REQUIRED_MIRROR_FREE_MB USABLE_FILE_MB OFFLINE_DISKS COMPATIBILITY DATABASE_COMPATIBILITY V
------------ ------------------------------ ----------- ---------- -------------------- ----------- ------ ---------- ---------- ----------- ------------ ----------------------- -------------- ------------- ------------------------------------------------------------ ------------------------------------------------------------ -
1 DATA 512 4096 1048576 MOUNTED EXTERN 15342 12616 0 2726 0 12616 0 11.2.0.0.0 10.1.0.0.0 N
2 FRA 512 4096 1048576 MOUNTED EXTERN 6133 6079 0 54 0 6079 0 11.2.0.0.0 10.1.0.0.0 N

SQL>



FRA disk group is ready to host our flash recovery area for archivelogs and backups.

This is a small but useful example of the ASM functionality.

Thanks,
Alfredo





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