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

Similar Messages

Questions on asm disk discover:

Questions on asm disk discover:
1）What is the relationship btween asm_diskstring in the init.ora and DiscoveryString in the GPNP profile.xml?
2) which one 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 do not rely on the path the discover the asmlib
disks. asm_diskstring='ORCL:*' will identify the right disks. I am not sure if setting 'ORCL:*' is the most economic way as I am not sure if Oracle will have to scan all the disks
on the OS and probe the disks that it has rigths to determine which disks belong to ASM. 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. However, this will be open to the persistent problem. Is my understanding correct?
Thanks.

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.

Question on Asm Disk Groups

Hello,
I have five 200gb (Total 1 TB) disks on my prod rac environment and we are using 11g 11.1.0.6. These disks have been mounted a while back and the db is currently 50gb full.
My question is i need to unmount one of the disks of 200gb since we are having a shortage of disks at the moment, so i can use it as the flash recovery drive. My understanding with asm is that even if once disk fails the rebalnce act would happen and it would stripe data across four disks without any loss of data or downtime.
We are using external redudancy on these disks and they use Raid 5.
Can i attempt this, if this is possible could you guys give me the best command i can use to do this.
Thx All

Just do an
alter diskgroup <name> drop disk <name>;The documentation states:
DROP DISK The DROP DISK clause lets you drop one or more disks from the disk group and automatically rebalance the disk group. When you drop a disk, Automatic Storage Management relocates all the data from the disk and clears the disk header so that it no longer is part of the disk group.
Note:
If you need to drop more than one disk i strongly recommend to do it in a single step, e.g.
alter diskgroup <name> drop disk <nameA>,<nameB>;Thsi will do the rebalance only once.
Ronny Egner
My Blog: http://blog.ronnyegner-consulting.de

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!

What is ORCL prefix for in ASM Disks?

version: 11.2 / RHEL 5.8
Once the ASM Disk is created using oracleasm, you can add the ASM Disk to the disk group like
SQL> alter diskgroup DATA1 add disk 'ORCL:DISK2';
Diskgroup altered.Is the prefix "ORCL:" mandatory ? What is it for, anyway ?

Oh ok. This means ASM Disks discovery path is hard coded to ORCL.
This is why ASM_DISKSTRING is not set for ASM instances using ASMlib (as shown below). Right ?
SQL> show parameter asm_diskstring
NAME TYPE VALUE
asm_diskstring string

ASM disks are not found at node2 on vmware

Hi All,
I'm very new to Oracle RAC. I was tring to install 10g rac in my desktop using vmware workstation. Also I configured the shared storage. Here i'hv rac1 and rac2 two virtual machines. while I created asm disks (ASM1,ASM2,ASM3) on rac1. While listing the asm disks at rac1 display the correct result but rac2 not returning anything.
Can anybody suggest on this. B'coz I tried several times rac installation and but it failed bcoz of mismatch ocr id.
Thanks

Does rac2's operating system see the disks? Assuming Linux for the remainder of this post:
Run "fdisk -l | more" on each node and compare the output. If you know the names of the devices (maybe something like: /dev/sdb /dev/sdc /dev/sdd), you can do an "ls -la /dev/sdb* " on each node and compare the file permissions and ownership. What is the ASM disk discovery string? Chances are rac2 has not picked up the new partitions created on rac1, which could be corrected by running "/sbin/partprobe /dev/sdb". If the device ownership is wrong, simply changing it as the root user won't persist across reboots: you will need to setup udev rules to re-apply permissions and ownership for each boot.
Only when the operating system device files are present, and owned by the correct user ("grid" or "oracle", depending on your installation), then you will be able to scan for the devices in ASM. In the case of RAC, you'll also need to ensure the device files are named identically between nodes. ASMLIB can help, but something like device mapper (/etc/multipath.conf, can be configured even to manage a single path as is the case when using a vmware's vmdk virtual disk) is usually a more robust solution in my opinion.
Some folks incorrectly assume that ASM will eliminate the system administration tasks entirely. The only thing it eliminates is managing devices after they've been successfully configured for use by ASM. LUN creation, zoning, masking, OS provisioning to include HBA bindings et al, and lastly OS permissions are all still very much required.
If still having problems, paste the above mentioned utility outputs and we will try to help you spot the issue.

ASM disk corrupted

Hi,
A few days ago, I have asked a question about“ASM disk header corruption”at ASM disk header corruption .
Because it was only my assumption, I didn't think about it deeply. This morning I encountered a problem from a thread. It said that the diskgroup couldn't mount, and ORA-15196 appeared in the alert.log.
It occurred to me that if the diskgroup couldn't mount and the header of an asm disk corrupted, how should I deal with it? Will the data in the ASM disk be lost?
Please help me with this problem.
Thanks in advance.

user526904 wrote:
I hope you have the backup, Incase its the media failure and if you can detemine the corroupt datafiles, just restore the corroupt datafiles from backup and recover them. Database backups cannot restore a corrupted ASM header. rman backups the Oracle data files. Not the physical ASM disk itself with the disk's headers.
To restore that, you will need a physical disk backup. A physical disk backup will need all processes using the disks to terminate in order to ensure that all file handles are closed and that the backup is consistent. Not something that is easily done in today's 24x7 environments. RAID is usually used to address this type of failure (e.g. via hot swappable disks, where you simply replace the faulty disk with a new one, while the storage system is running).
So where you do not have that physical redundancy, and have to deal with "physical disk" error (like corrupted header blocks), you need to be extremely careful on how to try and recover that. I would not even try and touch that disk. I will ensure that no processes touch that disk at all, create a duplicate disk (same size) and manually "mirror" the data (using dd for example). This will serve two purposes. Tests whether physical reads on the problem disk succeeds (is this actual media failure, or logical failure?). And create a 2nd disk that can be used for testing/playing purposes, prior to trying any fixes on the problem disk.

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.

Cloning ASM disks question?

I have a customer who has been running oracle 10.2.0.4 two node rac on HPUX Itanium platform and using raw devices for the datafile locations. They use EMC clraion for the storage platfom.
The customer uses EMC snapshot/cloning technology on the storage side to create a clone of the database luns for their staging database environment. This works well and they are able to simply snap the luns on the storage side and then simply mount them on another host and bring the database copy up an another host.
Well, now that they are in the process of 11g upgrade and the fact that raw devices will no longer be supported going forward for the most part the cusomter would like to start to use ASM for the clustered file system for the RAC databases.
I am trying to find out if there are any white papers or some documentation on how we could make clones when the disks are ASM disks? I know that EMC can snapshot the luns as they have in the past but not sure how we can get them mounted up in another ASM instance on a separate server?
Just wanting to know if anyone has some experience on cloning ASM disk or disk groups between different hosts and maybe some supporting documentation to go along with it.
Thanks.

YOU CAN. You can use the same EMC copy for the ASM Lun, attach it to another server and can start the ASM instance up. It is quiet same as you were doing it with raw devices.
ASM files has ASM headers on it. When you copy the disks over, asm instance can recognize those headers and be able to come online. ASm instance can identify the copied disks from their disk headers.

Oracle ASM Disks Question

Hi,
We have two Linux hosts accessing EMC SAN LUNs and we have Oracle ASM Disks created on those devices. Both the Linux Hosts (server1/2)are in once Dell Blade Chassis1 and one of the Server we are planning to move to a different Dell Chassis(2) to have redundency in case of Chassis1 faliure. But if we move one server2 to Chassis2 the HBA WWN Number for the host on the new Dell Chassis2 will change ( WWNs are assigned by Chassis on Dell) and the server2 will loose all the SAN LUNs from EMC Array. I will have to rezone the new server WWNs to storage and pesent the same disks again and rescan the disks which will take couple of reboots. During this period EMC LUNs will not be visible to server2 and I would like to what will happen to ASM disks on the server2 and how to I accomlish this goal? Any detailed steps please? This is a production system with oracle 11g running.
This is the output of emc powerpath devices (LUNs) which is same on both the hosts.
[root@server2 ~]# powermt display dev=all | grep emc
Pseudo name=emcpowerl
Pseudo name=emcpowerj
Pseudo name=emcpowerf
Pseudo name=emcpowerk
Pseudo name=emcpowerg
Pseudo name=emcpowerh
Pseudo name=emcpowerm
Pseudo name=emcpoweri
[root@server2 ~]#
This are the ASM disks on both the hosts:
[root@server2 ~]# oracleasm listdisks
DATA01_F1
DATA01_G1
DATA01_H1
DATA01_I1
FRA01_L1
LOG01_J1
LOG01_K1
[root@server2 ~]#
Thanks in advance.

808306 wrote:
But if we move one server2 to Chassis2 the HBA WWN Number for the host on the new Dell Chassis2 will change ( WWNs are assigned by Chassis on Dell) and the server2 will loose all the SAN LUNs from EMC Array.This does not sound correct to me. WWNs are global - not local. If the WWN is foo123 on server1 for EMC LUN1, why would it not also be foo123 on server2 for EMC LUN1? When you move to server3 or install server3, why would EMC LUN1 not have a WWN of foo123 on server3?
I will have to rezone the new server WWNs to storage and pesent the same disks again and rescan the disks which will take couple of reboots. Using Powerpath perhaps - using multipath, not. New devices (LUNs) can be made visible by the kernel my refreshing multipath - no reboot required. If existing LUNs are going to be changed - yes, a single reboot will be needed. But not multiple (unless you have a driver issue with stale connections not being reset on the storage server side).
This is the output of emc powerpath devices (LUNs) which is same on both the hosts.We dropped Powerpath a long time ago. There were compatibility issues between it and AsmLib kernel drivers. Powerpath taints the Linux kernel and limits kernel upgrade flexibility. I refuse to run it on our new clusters. I use multipath instead - the very same s/w used by some of the largest clusters (with Pentabyte storage) in the world. The comfort factor using Open Source drivers (and certified for that kernel version) is significantly higher than installing 3rd party kernel driver binaries - and having to deal with a 2nd party when it comes to o/s and kernel support.

Problem with create asm disk group

Hi all
I am about configuring ASM, so I have downloaded the Grid infrastructure 11g (32 bit), I have configured and created parameters and directories.
I runned the installer but get stack at the 3 step where I have to change the discovery path. I have taped as path /dev where I have created 3 partitions sdb1, sdc1 and sdd1.
Is there any thing should I perform on partitions may be or parameters to set before I go through the installation?
Thanks for help

You can use the below link to install ASMLIB:
http://gssdba.wordpress.com/category/asm/
REFERANCE : Doc ID 580153.1
There are two different methods to configure ASM on Linux:
ASM with ASMLib I/O: This method creates all Oracle database files on raw block devices managed by ASM using ASMLib calls. RAW devices are not required with this method as ASMLib works with block devices.
ASM with Standard Linux I/O: This method creates all Oracle database files on raw character devices managed by ASM using standard Linux I/O system calls. You will be required to create RAW devices for all disk partitions used by ASM.
You can download the ASMLIB rpm’s from below URL:
http://www.oracle.com/technetwork/server-storage/linux/downloads/rhel5-084877.html
STEP 01: LOG IN AS ROOT USER AND INSTALL THE RPMS
[root@node1 ASMLIB]# rpm -Uvh oracleasm-2.6.18-164.el5-2.0.5-1.el5.i686.rpm \
> oracleasmlib-2.0.4-1.el5.i386.rpm \
> oracleasm-support-2.1.8-1.el5.i386.rpm
warning: oracleasm-2.6.18-164.el5-2.0.5-1.el5.i686.rpm: Header V3 DSA signature: NOKEY, key ID 1e5e0159
Preparing… ########################################### [100%]
1:oracleasm-support ########################################### [ 33%]
2:oracleasm-2.6.18-164.el########################################### [ 67%]
3:oracleasmlib ########################################### [100%]
STEP 02: CONFIGURE ASMLIB
[root@node1 ASMLIB]# /etc/init.d/oracleasm configure
Configuring the Oracle ASM library driver.
This will configure the on-boot properties of the Oracle ASM library
driver. The following questions will determine whether the driver is
loaded on boot and what permissions it will have. The current values
will be shown in brackets (‘[]‘). Hitting <ENTER> without typing an
answer will keep that current value. Ctrl-C will abort.
Default user to own the driver interface []: oracle
Default group to own the driver interface []: dba
Start Oracle ASM library driver on boot (y/n) [n]: y
Scan for Oracle ASM disks on boot (y/n) [y]: y
Writing Oracle ASM library driver configuration: done
Initializing the Oracle ASMLib driver: [ OK ]
Scanning the system for Oracle ASMLib disks: [ OK ]
STEP 03 :CREATE ASM DISK
[root@node1 ASMLIB]# /etc/init.d/oracleasm listdisks
[root@node1 ASMLIB]#
[root@node1 ~]# /etc/init.d/oracleasm createdisk VOL1 /dev/sdb1
Marking disk “VOL1″ as an ASM disk: [ OK ]
[root@node1 ~]# /etc/init.d/oracleasm createdisk VOL2 /dev/sdc1
Marking disk “VOL2″ as an ASM disk: [ OK ]
[root@node1 ~]# /etc/init.d/oracleasm createdisk VOL3 /dev/sdd1
Marking disk “VOL3″ as an ASM disk: [ OK ]
[root@node1 ~]# /etc/init.d/oracleasm createdisk VOL4 /dev/sde1
Marking disk “VOL4″ as an ASM disk: [ OK ]
[root@node1 ~]# /etc/init.d/oracleasm createdisk VOL5 /dev/sdf1
Marking disk “VOL5″ as an ASM disk: [ OK ]
[root@node1 ~]# /etc/init.d/oracleasm listdisks
VOL1
VOL2
VOL3
VOL4
VOL5
[root@node1 ~]#

ASM disk mappings

Hi All
With ASMlib when setting up ASM you add disks with a command such as this " /etc/init.d/oracleasm createdisk VOL1 /dev/sdg" as described in metalink article 275315.1. You can then query the disks ASMlib knows about using this command "/etc/init.d/oracleasm listdisks" or you can see the asm disk aliases again by querying "select disk_number, name, path, state from v$asm_disk;"
My question is how do you see what the underlying alias maps to after the initial creation. Using the above example how do I see that "VOL1" maps to "/dev/sdg"
Thanks
Steve

No I thought it should be to but that just gives the alias names again plus the ASM discovery string that it uses for the default location of the disks...I guess I need it to tell me what that resolves to.
SQL> select path from v$asm_disk;
PATH
ORCL:DISK8
ORCL:DISK10
ORCL:DISK27
ORCL:DISK26
ORCL:DISK25
ORCL:DISK23
ORCL:DISK21
ORCL:DISK19
ORCL:DISK17
ORCL:DISK15
ORCL:DISK13
ORCL:DISK11
ORCL:DISK9
ORCL:DISK7
ORCL:DISK30
ORCL:DISK29
ORCL:DISK28
ORCL:DISK24
...

Asm disk removed taking too much time to boot

hi
a local machine is configured with ASM by oracleasm with a total disk.As it was a training purpose so i have removed the disk eg /dev/sdb bluntly ie. just removing it from box.now i tried fsck -c -c -f /dev/ in rescue mode its didnot worked even not mounting the /mnt/sysimage.It claims for ext2fs error and mounting the fs etc.
Then after lots of days has gone.i fed up with this issues and reinstalled OS.
but my question is what exactly to do?obviously re-installation is not the exact way to do.
regards

If the +/dev/sdb+ was an ASM disk, then it should not impact the o/s when it is removed. ASM instance itself will fail with an error saying something like it was not able to mount the disk group.
If your system failed to boot correctly after this disk was removed, then +/dev/sdb+ contained more than just ASM data.
We dynamically add and remove ASM (multipath'ed) disks via kpartx - while o/s is running. No reboot. No problems.
I fail to see how a ASM disk could cause the type of problems you describe - unless it was more than just a disk used by ASM alone.

Looking for information on the below questions on ASM

Scenario: (Oracle 10g on Windows 2003 with EMC storage)
ASM Partition table crashed for LUN 20 on 18th July
DB was up and running till 23rd July (New LUN (LUN 36) was presented and the RMAN backup used to restore the data that were residing on the corrupt LUN)
End of the day everything screwed up and the complete grid (4 nodes) was rebuild.
Links:
As mentioned in the link: http://www.exforsys.com/forum/oracle-database/487-what-asm-instance-oracle.html
"The ASM instance is only involved during the creation or deletion of files and when disk configurations change (such as dropping or adding a disk). When these types
of changes occur, the ASM instance automatically rebalanced the disks and provides the necessary information to refresh the extent map in the SGA of the database
instance. Of course, this process requires that the ASM instance run concurrently with the database instance, and only shut down after the database instance is
closed."
As mentioned in the link: http://www.orafaq.com/wiki/ASM_FAQ#ASM_disk_header.2Fsuperblock_backups.3F
"ASM disk headers (super-blocks) cannot be backed up and restored in Oracle 10g. By implication, if you use EXTERNAL REDUNDANCY and a single disk's header is
accidentally overwritten, the entire disk group will have to be restored."
As mentioned in the link: http://www.datadisk.co.uk/html_docs/oracle/asm.htm
"ASM is a special instance that does not have any data files, there is only ASM instance one per server which manages all ASM files for each database. The instance
looks after the disk groups and allows access to the ASM files. Databases access the files directly but uses the ASM instance to locate them. If the ASM instance is
shutdown then the database will either be automatically shutdown or crash. "
With the above scenario and the documents provided in the links above, I am unable to get the complete picture of what went wrong. Will be great if some one could
through more light on the below questions. (Note: we have multiple vendor engaged managing different part of this outage and unable to get the real fact of what went
wrong)
1, The ASM had given the details of the disk to the DB, and the DB is managing the disk directly. Also the DB and the ASM instance were up and running till 23rd is
what i understand going by the details given in the above links, in this scenario how can we confirm that the partition table is corrupt / missing. Is their a way to
check the same?
2, ASM disk headers (super-blocks) cannot be backed up, that means that it can not be read directly. Then is it possible to say that the ASM disk header is corrupt /
missing?
3, If the ASM disk header / partition table of LUN 20 is corrupt on 18th, can the DB run till 23rd without any issue? will the ASM & DB does not crash?
4, ASM will strip the data across the available LUN's, will it not be able to rebuild the data on the newly presented LUN 36 instead of using RMAN backup to rebuild the
data? or is the ASM not configured as it should be done. (WE have multiple LUN's presented to this Grid)
Edited by: 880333 on Aug 19, 2011 12:35 AM

What relation with the Oracle Forms product ?
Francois

ASM Disk preparation for Datafiles and FRA in Oracle 10g RAC Inst

Dear Friends,
Please clarify wheteher the below method is correct to confiure ASM disks for Datafiles and FRA
Partitions provided by IT team for OCR and Voting Disk
/dev/sda1 - 150 GB (For +DATA)
/dev/sda2 - 100 GB (For +FRA)
OS : RHEL 5.6 (64 Bit)
kernel version = 2.6.18-238.el5
Steps:(Node1)
1) Install the RPM's for ASM
rpm -Uvh oracleasm-support-2.1.7-1.el5.x86_64.rpm
rpm -Uvh oracleasm-2.6.18-238.el5-2.0.5-1.el5.x86_64.rpm
rpm -Uvh oracleasmlib-2.0.4-1.el5.x86_64.rpm
2) Configure ASM
/etc/init.d/oracleasm configure
Default user to own the driver interface []: oracle
Default group to own the driver interface []: dba
Start Oracle ASM library driver on boot (y/n) [n]: y
Scan for Oracle ASM disks on boot (y/n) [y]:
Writing Oracle ASM library driver configuration: done
Initializing the Oracle ASMLib driver: [ OK ]
Scanning the system for Oracle ASMLib disks: [ OK ]
3) Cretae ASM Disk
/etc/init.d/oracleasm createdisk DISK1 /dev/sda1
/etc/init.d/oracleasm createdisk DISK2 /dev/sda2
4)/etc/init.d/oracleasm status
5)/etc/init.d/oracleasm scandisks
6)/etc/init.d/oracleasm listdisks
7) Nothing to perform on Node2
8) In dbca choose ASM and map the DISK1 for datafiles and DISK2 for FRA
Please confirm the above steps are right?if not please clarify
If DBCA ->ASM doesn't discover my disk then what should be the Discovery path i have to give?
Please refer any document / Metalink ID for the above complete process
Can i have ASM and oracle DB binary in the same home
Regards,
DB

user564706 wrote:
If DBCA ->ASM doesn't discover my disk then what should be the Discovery path i have to give?for asm disk created with oracleasm discovery path variable is ORCL:*
Please refer any document / Metalink ID for the above complete processhttp://docs.oracle.com/cd/B19306_01/install.102/b14203/storage.htm#BABIFHAB
Can i have ASM and oracle DB binary in the same homeyes. unless you want job role seperation or plan to run multiple versions of oracle homes
>
Regards,
DB

Questions on asm disk discovery:

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