ASM 11gR2 Disk Discovery

Hi,
I've got the following scenario:
Say I have 3 ISCSI disks that is exposed to the 2 nodes as:
/dev/disk1 --> say 10Gb
/dev/disk2 --> say 20Gb
/dev/disk3 --> say 30Gb
I flag /dev/disk1 (the 10Gb disk) as a ASM disk and create a disk group.
After the server reboot the order in which the discs are seen by the server change and they are exposed as:
/dev/disk1 --> now the 30Gb
/dev/disk2 --> now the 10Gb
/dev/disk3 --> now the 20GB
Will this be a problem for ASM?
I'm sure I've read that ASM will automatically pickup the correct disk and mount the disk groups, but can't seem to find the document.
Can anyone please point me to the documentation for this?
Regards.

I found the following at:
http://www.oracle.com/technology/pub/articles/hunter-rac11gr2-iscsi.html#Create%20Partitions%20on%20iSCSI%20Volumes
Create Persistent Local SCSI Device Names
In this section, we will go through the steps to create persistent local SCSI device names for each of the iSCSI target names. This will be done using udev. Having a consistent local SCSI device name and which iSCSI target it maps to, helps to differentiate between the three volumes when configuring ASM. Although this is not a strict requirement since we will be using ASMLib 2.0 for all volumes, it provides a means of self-documentation to quickly identify the name and location of each iSCSI volume.
So it don't look like it will be a problem.
Can anybody maybe point me to the Oracle documentation stating this?
Thanks in advance.

Similar Messages

Questions on asm disk discovery:

Questions on asm disk discovery:
1）What is the relationship btween asm_diskstring in the init.ora and DiscoveryString in the GPNP profile.xml?
2) Which one of the above two finally accounts for the disk discovery process?
3) We know that asmlib disks are self describing at the disk header. This overcomes the disk name/path persistency issue as we no long need to rely on the path to discover the asm disks, by setting asm_diskstring='ORCL:*' , ASM instance will identify the right disks automatically. However, I am not sure if setting asm_diskstring='ORCL:*' is the most economic way to do the discovery as I am not sure if Oracle will have to probe all the disks on the OS to determine the right disks. If Oracle has to screen all the disks in this way, then I think setting asm_diskstring='<path_to_asmlib_disk>' will be much faster, although this will be open to the persistent problem. Is my understanding correct?
Thanks.

From my understanding all disk you see in /dev/oracleasm/disks are the disks in your system that been discovered by asmlib at discovery stage.
Currently, due to bug 13465545, ASM instance will discover disks from both locations, ASM_DISKSTRING and gpnp profile, which can cause some mess in disk representation for asm. You can check the settings using asmcmd command: dsget, and set to be the same using dsset.
I think its more secure to set ASM_DISKSTRING to only the disks used by asm instance.
ASMCMD> dsget
Regards
Ed

ASM LABLED DISK NOT SHOWN IN GRID INSTALLATION

Hi Guru,
Im new to oracle,just started, we are installing ORCALE 11gr2 11.2.0.3 single node cluster for an test environment on RHEL 6.2.
we installed oracle prerequisite with yum provided by oracle with following command.
yum install "oracle-rdbms-server-11gR2-preinstall" ##did all pathch,rpm & parameter set automatically.
create users oracle & grid with required group.
part-ion disk
#fdisk /dev/sd*
n,p,1,<>,<>,w
#partprob /dev/sd*
Install oracleasm with "yum install kmod-oracleasm" including support & asmlib file .
oracleasm configure
ORACLEASM_ENABLED=true
ORACLEASM_UID=grid
ORACLEASM_GID=asmdba
ORACLEASM_SCANBOOT=true
ORACLEASM_SCANORDER=""
ORACLEASM_SCANEXCLUDE=""
ORACLEASM_USE_LOGICAL_BLOCK_SIZE="false"
oracleasm listdisks
DATA01
DATA02
VOTE01
VOTE02
VOTE03
ls -ltr /dev/oracleasm/disks/*
brw-rw---- 1 grid asmdba 8, 17 May 17 15:58 /dev/oracleasm/disks/VOTE01
brw-rw---- 1 grid asmdba 8, 33 May 17 15:58 /dev/oracleasm/disks/VOTE02
brw-rw---- 1 grid asmdba 8, 49 May 17 15:58 /dev/oracleasm/disks/VOTE03
brw-rw---- 1 grid asmdba 8, 65 May 17 15:59 /dev/oracleasm/disks/DATA01
brw-rw---- 1 grid asmdba 8, 81 May 17 15:59 /dev/oracleasm/disks/DATA02
started grid installation with (grid, asmdba) ./runInstaller
Every things seems good till the time.
while it looks for asmdisk during installation it will not show asm labled disk there with discovery string "/dev/oracleasm/disks/*" -----"OCRL:*"
Please help, im stuck in this issue from 5 days.
Regards
Sumit Sharma

Hello,
To resolve this issue, first reconfigure your ASMlib using following steps:
[root@host02 ~]# ll -ltr /dev/oracleasm/disks/ASMDISK0*
brw-rw---- 1 grid asmadmin 8, 17 May 15 11:05 /dev/oracleasm/disks/ASMDISK01
brw-rw---- 1 grid asmadmin 8, 18 May 15 11:05 /dev/oracleasm/disks/ASMDISK02
brw-rw---- 1 grid asmadmin 8, 19 May 15 11:05 /dev/oracleasm/disks/ASMDISK03
brw-rw---- 1 grid asmadmin 8, 21 May 15 11:05 /dev/oracleasm/disks/ASMDISK04
brw-rw---- 1 grid asmadmin 8, 22 May 15 11:05 /dev/oracleasm/disks/ASMDISK05
brw-rw---- 1 grid asmadmin 8, 23 May 15 11:05 /dev/oracleasm/disks/ASMDISK06
brw-rw---- 1 grid asmadmin 8, 24 May 15 11:05 /dev/oracleasm/disks/ASMDISK07
brw-rw---- 1 grid asmadmin 8, 25 May 15 11:05 /dev/oracleasm/disks/ASMDISK08
If the permission is not like this then do the following:
*[root@host02 ~]# oracleasm configure -i*
Configuring the Oracle ASM library driver.
Default user to own the driver interface [asd]: grid
Default group to own the driver interface [asd]: asmadmin
Start Oracle ASM library driver on boot (y/n) [y]: y
Scan for Oracle ASM disks on boot (y/n) [y]: y
Writing Oracle ASM library driver configuration: done
[root@host02 ~]# oracleasm exit
[root@host02 ~]#
[root@host02 ~]#
[root@host02 ~]# oracleasm init
Loading module "oracleasm": oracleasm
Mounting ASMlib driver filesystem: /dev/oracleasm
[root@host02 ~]#
[root@host02 ~]#
[root@host02 ~]#
[root@host02 ~]# oracleasm scandisks
Reloading disk partitions: done
Cleaning any stale ASM disks...
Scanning system for ASM disks...
Instantiating disk "ASMDISK01"
Instantiating disk "ASMDISK02"
Instantiating disk "ASMDISK03"
Instantiating disk "ASMDISK04"
Instantiating disk "ASMDISK05"
Instantiating disk "ASMDISK06"
[root@host02 ~]#
[root@host02 ~]#
[root@host02 ~]#
[root@host02 ~]# oracleasm listdisks
ASMDISK01
ASMDISK02
ASMDISK03
ASMDISK04
ASMDISK05
ASMDISK06
Hope it will work.
Thanks,
Ashish Shukla

Database is not created on ASM configured Disks

hi,
I have installed Oracle 11gR2 Grid Infrastructure and Automatic Storage Management for a Standalone Server through "Grid" user. After then I install Oracle Database 11gR1 Software through "Oracle" User. There is no problem occure during the installation of these software. The OS is OEL-5.4. AND
ASM configured Disks are "DISK1, DISK2 AND DISK3" and the Group Name is "+DATA".
The Problem is when i want to create Database and chose ASM configured disk for Database storage, at the database creation process on 27% an error occur that is "ORA-03114 Not connected to Oracle". Sir but when i chose File System for Database Storage, Database created successfully.
Sir i am new in Oracle Grid Infrastructure and ASM please help me.

Hi buddy,
Are there errors in the alert.log of RDBMS istance, and what about traces ? Have it been generated ?
Regards,
Cerreia

Changing the AU_size parameter on ASM 11gR2

Hi Experts,
Is it possible to change the AU_Size parmeter of existing Diskgroup on ASM 11gR2?
Thanks
Vivek

872239 wrote:
Hi Experts,
Is it possible to change the AU_Size parmeter of existing Diskgroup on ASM 11gR2?
Thanks
VivekI Think no,
"This attribute can only be set when creating a disk group"
http://download.oracle.com/docs/cd/E11882_01/server.112/e16102/asmdiskgrps.htm#CHDIABGJ

ASM - Adding Disks and DiskGroups

I am quite eager to start using ASM on one of our test databases.
Using localconfig add, I have configured CSS, and am now using the dbca wizard to create an ASM instance and add disks and diskgroups.
I have reached the point in the wizard, where the wizard is showing no disk groups and we have to create new disk groups.
At this point I click "Create New" button, but in the "select member disks" it shows no disks to select. I though ASM can manage filesystems, disks and raw devices. Why is it not showing any disks here? There are plenty of disks when I do a df -h on the unix prompt. Shouldnt the disks available in the filesystem be available here?
I am asking this question knowing pretty well that it is probably the daftest question ever asked on this forum. Sorry for that!

Thanks.
I have defined the parameter ASM_DISKSTRING to a value of / (forward slash). I was hoping that this should enable disk discovery. The filesystems available on my server as checked through df -h are as follows.....
Filesystem_
/dev/md/dsk/d12
/proc
mnttab
fd
/dev/md/dsk/d32
swap
swap
/dev/md/dsk/d51
/dev/md/dsk/d52
/dev/md/dsk/d53
/dev/md/dsk/d54
/dev/md/dsk/d56
/dev/md/dsk/d55
/dev/md/dsk/d57
/dev/md/dsk/d71
/dev/md/dsk/d73
/dev/md/dsk/d72
/dev/md/dsk/d74
/dev/md/dsk/d75
/dev/md/dsk/d76
/dev/md/dsk/d77
/dev/md/dsk/d79
I tried giving the /dev/md/dsk path as well, but that does not seem to change anything either...
I tried both the above and also tried changing the disk discovery path in the wizard....
Nothing works.

Configuring Oracle ASM 11gR2 to use ASMM

Hello,
Kernel hugepages under Oracle Linux is incompatible with Oracle AMM. The Oracle ASM instance under 11g uses AMM by default. So in order to configure Oracle ASM to use ASMM, what are the recommended settings please?
I reviewed http://docs.oracle.com/cd/E18283_01/server.112/e16102/asminst.htm#CHDBBIBF which outlines some information about various pool size parameters required for ASMM, depending on the size of the datafiles that will used.
But what about typical ASMM parametes like sga_target and pga_aggregate_target, or are these not used in an ASM instance?
How have you configred ASMM for Oracle ASM 11gR2?
Thanks!

The minimum MEMORY_TARGET requirment for Oracle ASM is 256 MB. which we have set in ASM.
But what about typical ASMM parametes like sga_target and pga_aggregate_target, or are these not used in an ASM instance? yes ,they will be used ,below snap from aix 6.1 OS
SQL> sho parameter memory
NAME                                 TYPE        VALUE
memory_max_target                    big integer 272M
memory_target                        big integer 272M
SQL> r
1* select * from V$MEMORY_DYNAMIC_COMPONENTS
COMPONENT                         CURRENT_SIZE   MIN_SIZE   MAX_SIZE USER_SPECIFIED_SIZE OPER_COUNT LAST_OPER_TYP LAST_OPER LAST_OPER GRANULE_SIZE
shared pool                          201326592 201326592 201326592                   0          0 STATIC                                 4194304
large pool                            20971520   12582912   20971520            12582912          2 GROW          IMMEDIATE 04-JUN-12      4194304
java pool                                    0          0          0                   0          0 STATIC                                 4194304
streams pool                                 0          0          0                   0          0 STATIC                                 4194304
SGA Target                           264241152 255852544 264241152                   0          2 GROW          IMMEDIATE 04-JUN-12      4194304
DEFAULT buffer cache                         0          0          0                   0          0 STATIC                                 4194304
KEEP buffer cache                            0          0          0                   0          0 STATIC                                 4194304
RECYCLE buffer cache                         0          0          0                   0          0 STATIC                                 4194304
DEFAULT 2K buffer cache                      0          0          0                   0          0 STATIC                                 4194304
DEFAULT 4K buffer cache                      0          0          0                   0          0 STATIC                                 4194304
DEFAULT 8K buffer cache                      0          0          0                   0          0 STATIC                                 4194304
COMPONENT                         CURRENT_SIZE   MIN_SIZE   MAX_SIZE USER_SPECIFIED_SIZE OPER_COUNT LAST_OPER_TYP LAST_OPER LAST_OPER GRANULE_SIZE
DEFAULT 16K buffer cache                     0          0          0                   0          0 STATIC                                 4194304
DEFAULT 32K buffer cache                     0          0          0                   0          0 STATIC                                 4194304
Shared IO Pool                               0          0          0                   0          0 STATIC                                 4194304
PGA Target                            20971520   20971520   29360128                   0          2 SHRINK        IMMEDIATE 04-JUN-12      4194304
ASM Buffer Cache                      25165824   25165824   25165824                   0          0 STATIC                                 4194304
16 rows selected.Edited by: Kuljeet Pal Singh on Jun 27, 2012 6:59 PM

How ASM Manages Disk Failures

Hi,
Was going through Oracle ASM document and came across this topic, need some clarification on this please.
"The disks are first taken offline and then automatically dropped. In this case, the disk group remains mounted and serviceable. In addition, because of mirroring, all of the disk group data remains accessible. After the disk drop operation, Oracle ASM performs a rebalance to restore full redundancy for the data on the failed disks". -- What does this mean?
Thanks

Simple example.
Single normal redundancy diskgroup DATA1 with 2 failgroups called MIRROR1 and MIRROR2. Each failgroup has 3 x disks (let's say 512GB).
Disk 2 in failgroup MIRROR1 fails. The MIRROR1 failgroup is not available as a result. DB operations continue unaware of the problem as MIRROR2 is online and working fine.
The dba cannot fix disk 2 within the meantime for repair period of ASM. ASM forces disk 2 out the MIRROR1 failgroup by force dropping it. MIRROR1 has now 2 disk remaining.
ASM starts a rebalance process to stripe the contents of the MIRROR1 failgroup across 2 disks - as oppose to 3 disks. If the space in use fits on 2 disks the rebalance operation will succeed. MIRROR1 will become online and available. But it will only be able to carry 1TB of data, as oppose to MIRROR2 with it 3 disks and 1.5TB capacity.
If the space used cannot be striped across the remaining disks in MIRROR1, the rebalance will fail due to insufficient capacity and the failgroup will remain offline.
In either scenario, the recommended action is to add a new 512GB disk to MIRROR1, reverting it back to a 3 disk failgroup, and then rebalance the failgroup.

ASM disk discovery

Hi
I am trying to use ASM in my windows server (xp). my database version is 10.2.0.3.
1. I have add disk by asmtool as under
a. j:\ partition of my windows I dropped then recreate the partition without file system with drive letter j:
b. C:\>asmtool -add -force j:
2. From DBCA I choice option ASM configure . ASM instance created but I am not able to discover the disk so not able to create disk group
please guide me in this regards
Rabi
Edited by: user623166 on Jul 11, 2011 4:57 AM

I think you have to check whether you have given the permissions for the ORACLE user on the disk which you supposed to create the diskgroup ..If you have given the permission then check whether that disk is formatted with any filesystem..Make sure that disk must not be formatted. if the disk is not yet formatted then please check whether its displaying the disks on the OS...GoodLuck!

ASM candidate disks not found

Hi all,
I am trying to install 2-node 11gR2 RAC on CentOS 5.6 using VMWare Fusion. I'm in the middle of Grid Infrastructure installation and while choosing the ASM diskgroups I don't see any candidate disks but when I click on all disks i can see them but can't select them.
I tried installing the grid before and ended up with and issue running the root.sh on all the nodes so had to deconfigure the grid binaries using the rootcrs.pl and then deinstalled the grid software using the ./desintall utility.
I'm not sure what has went wrong now when tried installing again ...I ran the cluvfy utility ..it doesn't show any errors.
Any advice on this is appreciated
Thanks
Sarat

I tried this Thread but didnt work for me its the exact issue im facing ..as shown in this thread.. I ran the below commands on both the nodes
Reinstall Grid infrastructure ASM no cadiates.
dd if=/dev/zero of=/dev/diskname bs=1024 count=100
Edited by: 861173 on Aug 26, 2011 11:24 PM

How to Install Oracle ASM 11gR2 In Oracle Linux 6.5

Hi
I want to install oracle ASM in oracle linux 6.5 .
Can any one helps me to find a paper with above subject?
Thanks

Theses steps only if You want to use ISCSI. This is fine to get the howto:
If You ar running in VM Ware Boxes:
Add the following to the *.vmx file for the virtual machine:
disk.EnableUUID = "TRUE"
Restart the vm machine and the /dev/disk/by-id/scsi**** should be visible.
That's a nasty one - without this ISCSI just doesn't work
chkconfig iscsi on
iscsiadm -m discovery -t st -p 192.168.146.100
iscsiadm -m node -T iqn.1991-05.com.microsoft:iscsi-asm-target -p 192.168.146.100 -l
192.168.146.100 <=== IP Number of ISCSI Host
iqn.1991-05.com.microsoft:iscsi-asm-target <== Name of ISCSI Server, you get this as output from discovery command
Now, you must make sure that the devices belong to oracle.
Take a look at this link:
http://www.oracle-base.com/articles/linux/udev-scsi-rules-configuration-in-oracle-linux-5-and-6.php#make_scsi_devices_trusted
Add the following to the "/etc/scsi_id.config" file to configure SCSI devices as trusted. Create the file if it doesn't already exist.
options=-g
/sbin/scsi_id -g -u -s /block/sdc <== for all ISCSI devives
vi /etc/udev/rules.d/99-oracle-asmdevices.rules
KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id -g -u -s /block/$parent", RESULT=="360003fff419213c1a9a1ce9b75e35f63", NAME="asm1-disk1", OWNER="asm", GROUP="dba", MODE="0660"
KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id -g -u -s /block/$parent", RESULT=="360003fff419213c18af9aa132d316eca", NAME="asm1-disk2", OWNER="asm", GROUP="dba", MODE="0660"
KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id -g -u -s /block/$parent", RESULT=="360003fff419213c1b5bd65a6089784ae", NAME="asm1-disk3", OWNER="asm", GROUP="dba", MODE="0660"
KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id -g -u -s /block/$parent", RESULT=="360003fff419213c1b0098f974c463139", NAME="asm1-disk4", OWNER="asm", GROUP="dba", MODE="0660"
KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id -g -u -s /block/$parent", RESULT=="360003fff419213c18b94be6b8e64ae1a", NAME="asm2-disk1", OWNER="asm", GROUP="dba", MODE="0660"
KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id -g -u -s /block/$parent", RESULT=="360003fff419213c1ba97827387889d2f", NAME="asm2-disk2", OWNER="asm", GROUP="dba", MODE="0660"
KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id -g -u -s /block/$parent", RESULT=="360003fff419213c19344e120143d71a6", NAME="asm2-disk3", OWNER="asm", GROUP="dba", MODE="0660"
KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id -g -u -s /block/$parent", RESULT=="360003fff419213c1b088599c1a9a0a7f", NAME="asm2-disk4", OWNER="asm", GROUP="dba", MODE="0660"
RESULT=="360003fff419213c1b088599c1a9a0a7f" <=== That is returned by /sbin/scsi_id -g -u -s
Reload:
/sbin/udevcontrol reload_rules
/sbin/start_udev
Now you have your devices read, belonging to oracle:
ls -al /dev/asm*
Next go to oracle download click on list all and get:
Oracle Grid Infrastructure 11g Release 2 (11.2.0.1.0) for Linux x86-64
After extracting this you are ready to go.
When starting the install process you get an option to "change path", here select /dev.
In my test systems I use to set "external" for dataprotection.
Regards
Christian

Oracle ASM Member disks online & offline options are disable

Hi Guru's
OS:- RHEL5
DB :- 11GR2
I am trying to offline the members of a disk group using EM but what i found that the members are listed there but online and offline options are inactive there. Can you please tell me why it is so . Even after selecting the member the options are still inactive
Thanks in advance

vk82 wrote:
Actually now what happens is as the options are disabled i thought i added another physical disk by powering off the machine with properly shutdown the db and ASM instance. But when i try to restart the db i am getting the error as :-
ERROR at line 1:
ORA-01565: error in identifying file '+DATA/orcl/spfileorcl.ora'
ORA-17503: ksfdopn:2 Failed to open file +DATA/orcl/spfileorcl.ora
ORA-15056: additional error message
ORA-17503: ksfdopn:DGOpenFile05 Failed to open file +DATA/orcl/spfileorcl.ora
ORA-17503: ksfdopn:2 Failed to open file +DATA/orcl/spfileorcl.ora
ORA-15001: diskgroup "DATA" does not exist or is not mounted
ORA-06512: at line 4
ASM Instance is started fine
SQL> startup
ASM instance started
Total System Global Area 284565504 bytes
Fixed Size                  1336036 bytes
Variable Size             258063644 bytes
ASM Cache                  25165824 bytes
ASM diskgroups mounted
SQL>
Please help me over the same
Sorry, I read error again:
ORA-15001: diskgroup "DATA" does not exist or is not mounted
select name from v$asm_diskgroup:
Regards
Mahir

ASMCA needs Oracle Grid Infrastructure to configure ASM - 11gR2 on SLES11

Hi,
I'm trying to install 11gR2 with ASM on a new SLES11 Server. So far i successfully installed the Database Software but struggle now when it comes to installing the Grid Infrastructure.
Partitioning and stamping the disks as ASM disks worked fine, oracleasm listdisks would give me my disknames as output.
So far so good - in the grid infrastructure installer i chose "install and configure grid infrastructure for a standalone server"
The setup was working, i executed the root.sh script without any issues - but configuring ASMCA failed with the following error:
INFO: Read: Error while detecting Oracle Grid Infrastructure. ASMCA needs Oracle Grid Infrastructure to configure ASM.
Unfortunately i couldn't find a lot about it on the internet - i'm very stuck here..
Any ideas?
Andrea

i used raw devices in my first attempt - but read that it's not supported anymore - so i configured them as asm disks using the oracleasm tool.
which worked.. so the disks can not be the problem
i already read amans solution before posting here - but the problem in that thread was different - the guy installed the grid infrastructure software only and then tried to manually configure it, which failed.
His solution was to delete his previous install and choose '+Install and Configure Grid Infrastructure for a standalone server+' in the installer.
I already started my installation with Install and Configure Grid Infrastructure for a standalone server ... so that's no solution either :(

Asm candidate disk not listed in the OUI grid infrastructure

I am installing 11g R2 two node RAC on OEL 5. 4.and openfiler
In the middle of the GRID infrastructure installation,at the window "Create ASM Disks", the disks are not listed.
I have installed and configured Asm lib through configure command
I was able to list the disks with the below commands
1./etc/init.d/oracleasm listdisks it was listing
CRSVOL1
DATA1
FRAVOL1
2. /etc/init.d/oracleasm-discover ORCL:*
i was able to discover the disks
I had change the Discovery path in the "Create ASM Disks" to ORCL:* still it is not appearing
Any help is appreciated.
Dave

Hi,
You can change Discovery Path of ASM to : /dev/oracleasm/disks/*
It's same result and Oracle recommend do that in case of discover (ORCL:*) not working.
Check this note:
*FAQ ASMLIB CONFIGURE,VERIFY, TROUBLESHOOT [ID 359266.1]*
Put here output of :
strace -f -o asm_discover.out /etc/init.d/oracleasm-discover 'ORCL:*'Regards,
Levi Pereira

ASM CREATE DISK FAILED

i am getting this error while trying to create disk
[root@dbanew sysconfig]# /etc/init.d/oracleasm createdisk VOL1 /dev/sda3
Marking disk "/dev/sda3" as an ASM disk: asmtool: Unable to clear device "/dev/sda3": Input/output error
[FAILED]
[root@dbanew sysconfig]#
could any please look into this and help me

try to clear the disk with the command:
dd if=/dev/zero of=/dev/sda3 bs=4096 count=10000
and after that do your createdisk. perhaps there are some infos in the diskheader that prevents
asmlib from doing its work.

ASM 11gR2 Disk Discovery

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