Question on ASM operation

Hi,
i am using oracle 11gR1 and ASM as storage option. user sys is ASM admin but i am not able to access ASM instance with sys user. if i do su oracle then i can access asm instance , do asm dg operation etc. i thought ASM admin is the one who can do execute some operation on asm instance and asm dg etc. should i always use "oracle" user for ASM operation . cant i use "sys" user for this. Please share your view on this.
Thanks for your help,

user11305560 wrote:
is it possible to make one OS user owner of crs and make one OS user admin of ASM instance. i believe the CRS owner will have permission to do ASM administration also. Following is the error message, i am getting when i am doing su sys.
$ export ORACLE_SID="+ASM1"
$ su sys
$ sqlplus '/ as sysdba'
SQL*Plus: Release 11.1.0.6.0 - Production on Thu Nov 5 20:19:45 2009
Copyright (c) 1982, 2007, Oracle. All rights reserved.
ERROR:
ORA-01031: insufficient privileges
Enter user-name: sys
Enter password:
ERROR:
ORA-15000: command disallowed by current instance type
############################################3
when i do su oracle it works fine.
$ su oracle
$ sqlplus '/ as sysdba'
SQL*Plus: Release 11.1.0.6.0 - Production on Thu Nov 5 20:21:05 2009
Copyright (c) 1982, 2007, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - 64bit Production
With the Partitioning, Real Application Clusters, OLAP, Data Mining
and Real Application Testing options
SQL>If you install ASM by "oracle" user, you should use "oracle" to connect ASM as sysdba

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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?
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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

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.

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The engineer is largely correct. By default, the APs will tunnel all traffic to the controller to be distributed according to VLAN/SSID. The controller and the AP work together to perform the normal wireless <-> wired bridging. This allows some flexibility in how the infrastructure handles mobile clients. There are many benefits to the Cisco Unified model (or LWAPP).
We have three hospital campuses and only a couple remote wireless sites. They are all well-connected. As all our primary app servers are on one campus, we only have controllers on that one campus. The client traffic is bridged at the main campus.
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http://www.cisco.com/univercd/cc/td/doc/product/wireless/control/c44/ccfig41/index.htm
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Question about ASM

Hi dears,
I am planning the installation of G.I 11R2 and have a question regarding ASM.
If I have ASM diskgroup with normal or high redundancy for my DB need I create multiplex redologs and
multiplex controlfiles ? If I understood correctly the multiplex redologs and controlfile is another HA and DR option.
From Oracle documentation
*"To protect against a failure involving the redo log itself, Oracle Database allows a multiplexed redo log, meaning that two or more identical copies of the redo log can be automatically maintained in separate locations."*
Question rised when I checked my old G.I with RACcheck and got the following....
The online redo logs of an Oracle database are critical to availability and recoverability and should always be multiplexed even in cases where fault tolerance is provided at the storage level.
The controlfile of an Oracle database is critical to availability and recoverability and should always be multiplexed even in cases where fault tolerance is provided at the storage level.
"should always be multiplexed even in cases where fault tolerance is provided at the storage level"
WHY ????
Please share your experience.
./thanks

Ilmar Kerm wrote:
Redo logs and controlfile are very critical for database, and if something happened with one copy of them (like file is deleted or corrupted) you can quickly recover by copying over the damaged file with the contents from the surviving file (copies are identical). So copies should be located on separate LUNs/disks/diskgroups/filesystems.Thanks Ilmar for reply.
I understand what you said its obvious. My questions is that if I already have 2 copies or 3 copies of redolog files with ASM nigh or normal redundancy why I need to do it also with creating multiplex redo file.....

Few Questions on ASM

Hi,
I am new to ASM and I have few questions regarding ASM.
1.In a RAC environment I understand there will be 2 ASM instanace for a 2 node RAC.If one of the node crashes for ASM what will happen to
the other instance and How will other instance will know about crash of one of the instance.
2.How can I backup ASM database through RAMN and How can I recover to a different new machine without ASM.
3.Where should I keep my archive logs,can I keep my archive logs on ASM if so how can I configure the database for that.
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Regards
MMU

MMU,
ASM is a volume manager like other volume manger available in the market. ASM does not have any data dictionary and there is no need to take backup of ASM instance as this will have only metadata about ASM disks and ASM instance itslef keep mirrored copy of this metadata internally.
Regarding your questionsa about backup, I would suggest you to go thru Oracle Backup and Recovery Advanced User Guide available from OTN.
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V$ASM_DISK
V$ASM_DISKGROUP
V$ASM_OPERATION
V$ASM_FILE
V$ASM_ALIAS
Thanks & Regards

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)
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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
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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

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