recommendation of Oracle asmlib or raw for 11g ASM

looking for best practice note on this subject for different OS such as linux, Solaris and windows? and how to configure?

DBA2008 wrote:
looking for best practices note on this subject for different OS like linux, Solaris & windows? & How to configure?

You're confused raw (raw devices) with "raw + +" (block devices for raw character devices)...

To explain...

All devices are 'rough' - even your 'C: drive ' traditional... until what it is mounted by a driver that provides access "cooked the file system.

Oracle ASM works directly with these raw devices - it must NOT be mounted by a file system driver (ASM can not use it because the camera is locked/used by this other driver). And the raw device does NOT contain a file system (ASM will open this device and destroy).

So what of the question that "raw is obsolete? It is a device driver very specific on Unix/Linux allowing a character (raw) device be used as a (raw) blocking the device. Why?

Because on older kernels do not use the direct i/o (RAW) only on (raw) and character devices, block devices. This crude device driver linked a block on a character device device, allowing direct use e/s. And direct i/o is what s/w like file systems of RDBMS and want ASM dealing with raw as oppose to the cooking devices.

So there is no such notion as ' raw devices versus AsmLib + + ". This is absurd.

AsmLib is a kernel driver that provides a layer of management for raw devices logical device. The same type of s/w delivered by default under Linux and is called Multipath.

EMC has their own patented kernel called Powerpath driver which covers essentially the same game featured.

So to use the raw devices is the standard and the standard with the ASM. The storage array or LUN from the server will be seen by the kernel of the server database as scsi devices. These devices must be put at the disposal of the DSO. There are issues such as multiple I/O paths to the SAN to address. Issues such as consistency in device name. Issues such as ownership of the device and permissions. Etc.

AsmLib can be used at this address. Is it recommended? Not really because on Linux Multipath is designed to do this work. And she does very well on the clusters of 1000 + node connected to without very seriously. He does what AsmLib and better - with the exception of being able to format a device of ASM with a label header ASM (made by ASM itself anyway to a new disk to a disk group).

So yes, there's Metalink/MoS notes that proclaim the '+' goodness + AsmLib. But this isn't a prerequisite. It is not recommended by Oracle to use as a replacement for Multipath (none of the best docs of practical Oracle I said that).

Don't forget that AsmLib is a layer of extra kernel drivers that must be loaded and configured. I don't see the use of myself and we don't use AsmLib on any of our RAC clusters. Multipath is used and it does the job and does it well.

Tags: Database

Similar Questions

Oracle ORA-01034 unavailable for 11g R2 xe
I get the following error

Oracle not available ORA-01034
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process ID: 0
session id: 0 serial No.: 0

In the paper, I get the same

Message not found 51; No product message file = RDBMS, installation = ORADIM

My Tnsnames.ora is

XE =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP) (HOST = siva-ae2ba51)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = XE)
)
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EXTPROC_CONNECTION_DATA =
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(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = CIP)(KEY = EXTPROC1))
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(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
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)

ORACLR_CONNECTION_DATA =
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(ADDRESS = (PROTOCOL = CIP)(KEY = EXTPROC1))
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(SID = CLRExtProc)
(PRESENTATION = RO)
)
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Listener.ora
=============

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)
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)
)

LISTENER =
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(DESCRIPTION =
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can you get it someone pls suggest me what I do for this

Published by: Jean Jacques on September 26, 2011 05:36
Lina says:
I get the following error

Oracle not available ORA-01034

Is it a new installation, so that the instance has never been available earlier?

If this is the case, you might as well just remove and start again rather than trying to solve an installation failure.

What is the platform/os, Windows? Edition, version, etc.

Message not found 51; No product message file = RDBMS, installation = ORADIM

Dim - 51 simply means that this instance has been created successfully, so not really mistake in my opinion.

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Can I take advatage of new features in 11g ASM with 10g RDBMS Database? If any limitation so that is advatge for me to go to 11g ASM on 10g RDBMS, as appropriate?

Thank you
Verdier
Hello

I was living benefits ASM 11 g as (ACFS, ADVM, instant, IIP of Placement Intelligent Data). I could be > to use one of these if my RDBMS is 10g?

Here: [features enabled by disk group attribute compatibility settings | http://download.oracle.com/docs/cd/E11882_01/server.112/e10500/asmdiskgrps.htm#CHDBCHIH] there is a table with what is or is not possible to use depending on your configuration.

The specific advantages/disadvantages if we opt for 11g ASM for 10g RDBMS DB? We are planing to implement this > so any information / documentary links will be appreciated.

The main advantage is that a single instance of the ASM will be able to support different customer RDBMS and the main disadvantage is that not all ASM new feautures will be supported for disk groups that are defined for reduce the compatibility properties.

It will be useful,
Cerreia

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Hello guys,.
You need help. I don't understand this problem. Oracleasm don't load.
Oracle version: 11.2.0.3
Version of the Linux kernel: Linux xxx.com 2.6.18 - 371.4.1.el5 #1 SMP Wed Jan 8 18:42:00 GMT 2014 x86_64 x86_64 x86_64 GNU/Linux
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Check if/dev/oracleasm is mounted: no
------------------------------------------------------------------------
Configure /etc/init.d/oracleasm #.
Configuring the Oracle ASM Library driver.
This sets up the properties on the startup of the Oracle ASM library
pilot. The following questions will determine whether the driver is
load on startup and it will have permissions. The current values
appears between square brackets ("[]"). Hitting < ENTER > without having to type a
response will keep this current value. CTRL-C will stop.
User by default to the owner of the [oracle] driver interface: oracle
Group defaults to the owner of the [asmdba] driver interface: asmdba
Start Oracle ASM Library driver at startup (y/n) [y]: y
Scan of Oracle ASM disks at startup (y/n) [y]: y
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The Oracle ASMLib driver initialization: [FAILURE]
-----------------------------------------------------------------------------
I downloaded the correct asm library packages.
uname - a
Linux hostname 2.6.18 - 371.4.1.el5 #1 SMP Wed Jan 8 18:42:00 GMT 2014 x86_64 x86_64 x86_64 GNU/Linux
RPM - qa | grep oracleasm
oracleasm - 2.6.18 - 371.4.1.el5 - 2.0.5 - 1.el5
oracleasmlib - 2.0.4 - 1.el5
oracleasm-support - 2.1.8 - 1.el5
SELINUX is disabled.
/ var/log/oraleasm
Could not load module 'oracleasm.
Load the module "oracleasm": failed
Could not load module 'oracleasm.
Load the module "oracleasm": failed
Could not load module 'oracleasm.
Load the module "oracleasm": failed
Could not load module 'oracleasm.
Load the module "oracleasm": failed
Could not load module 'oracleasm.
Reload from disk partitions: fact
Cleaning up stale ASM disks...
ASM disks scanning system...
oracleasm-read-label: could not open device ' / dev/dm-0 ': no such file or directory
oracleasm-read-label: could not open device ' / dev/dm-0 ': no such file or directory
oracleasm-read-label: could not open device ' / dev/dm-0 ': no such file or directory
oracleasm-read-label: could not open device ' / dev/dm-0 ': no such file or directory
oracleasm-read-label: could not open device ' / dev/dm-1 ': no such file or directory
oracleasm-read-label: could not open device ' / dev/dm-1 ': no such file or directory
oracleasm-read-label: could not open device ' / dev/dm-1 ': no such file or directory
oracleasm-read-label: could not open device ' / dev/dm-1 ': no such file or directory
oracleasm-read-label: could not open device ' / dev/dm-2 ': no such file or directory
oracleasm-read-label: could not open device ' / dev/dm-2 ': no such file or directory
oracleasm-read-label: could not open device ' / dev/dm-2 ': no such file or directory
oracleasm-read-label: could not open device ' / dev/dm-2 ': no such file or directory
oracleasm-read-label: could not open device ' / dev/dm-3 ': no such file or directory
oracleasm-read-label: could not open device ' / dev/dm-3 ': no such file or directory
oracleasm-read-label: could not open device ' / dev/dm-3 ': no such file or directory
oracleasm-read-label: could not open device ' / dev/dm-3 ': no such file or directory
oracleasm-read-label: could not open device ' / dev/dm-4 ': no such file or directory
oracleasm-read-label: could not open device ' / dev/dm-4 ': no such file or directory
oracleasm-read-label: could not open device ' / dev/dm-4 ': no such file or directory
oracleasm-read-label: could not open device ' / dev/dm-4 ': no such file or directory
oracleasm-read-label: could not open device ' / dev/dm-5 ': no such file or directory
oracleasm-read-label: could not open device ' / dev/dm-5 ': no such file or directory
oracleasm-read-label: could not open device ' / dev/dm-5 ': no such file or directory
oracleasm-read-label: could not open device ' / dev/dm-5 ': no such file or directory
oracleasm-read-label: could not open device ' / dev/dm-75 ': no such file or directory
oracleasm-read-label: could not open device ' / dev/dm-75 ': no such file or directory
oracleasm-read-label: could not open device ' / dev/dm-75 ': no such file or directory
oracleasm-read-label: could not open device ' / dev/dm-75 ': no such file or directory
oracleasm-read-label: could not open device ' / dev/dm-76 ': no such file or directory
oracleasm-read-label: could not open device ' / dev/dm-76 ': no such file or directory
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oracleasm-read-label: could not open device ' / dev/dm-76 ': no such file or directory
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Can someone help me understand what I missed.
Kind regards
Ashish

Hey Vandana,

Leave was correct, he had some problems with the packages that I downloaded earlier. I downloaded again and this way it is resolved. See below.

The only difference is in the size of RPM. First of all, I downloaded below:

Name: oracleasmlib relocations: (not transferable)

Version: 2.0.4 vendor: Oracle Corporation

Release date: 1.el5 Build Date: Wednesday, March 18, 2009 03:27:43 CEST

Install Date: Thursday, February 13, 2014 06:52:06 AM IS Host of generation: ca - build23.us.oracle.com

Group: System environment/Kernel Source RPM: 2.0.4 - oracleasmlib - 1.el5.src.rpm

Size: 21792 License: Oracle Corporation

Signature: DSA/SHA1, Thursday, December 3, 2009 03:07:19 pm, Key ID 66ced3de1e5e0159

Packager: Joel Becker [email protected]>

URL: http://oss.oracle.com/

Summary: The Oracle Automatic Storage Management userspace code library.

Description:

The library of user Oracle for Oracle Automatic Storage Management space

Now, I installed this and problem solved.

Name: oracleasmlib relocations: (not transferable)

Version: 2.0.4 vendor: Oracle Corporation

Release date: 1.el5 Build Date: Wednesday, March 18, 2009 03:25:42 CEST

Install Date: Friday, February 14, 2014 08:13:05 CEST Host of generation: ca - build24.us.oracle.com

Group: System environment/Kernel Source RPM: 2.0.4 - oracleasmlib - 1.el5.src.rpm

Size: 25672 License: Oracle Corporation

Signature: DSA/SHA1, Thursday, December 3, 2009 03:07:19 pm, Key ID 66ced3de1e5e0159

Packager: Joel Becker [email protected]>

URL: http://oss.oracle.com/

Summary: The Oracle Automatic Storage Management userspace code library.

Description:

The library of user Oracle for Oracle Automatic Storage Management space

Looks like he had a problem with the download of packages because the size varies. in any case thanks a lot.

Kind regards
Ashish Francis

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Hello

OEL 5.6 64 bit
DB 11 GR 2 64-bit

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libtheora-1.0alpha7-1
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ORACLEASM_ENABLED=true
ORACLEASM_UID=oracle
ORACLEASM_GID=asmadmin
ORACLEASM_SCANBOOT=true
ORACLEASM_SCANORDER=""
ORACLEASM_SCANEXCLUDE=""


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Dropping Oracle ASMLib disks:                              [  OK  ]
Shutting down the Oracle ASMLib driver:                    [  OK  ]
Initializing the Oracle ASMLib driver:                     [FAILED]
[root@rac-1 ASM]#

can anyone help?

You may confuse the package with oracleasm oracleasmlib. The oracleasm package contains only the kernel driver, which is included in the unbreakable Oracle Enterprise core and does not need to be installed. If I remember correctly, OEL 5.6 installed the kernel default UEK.

The oracleasm-support and oracelasmlib packages, however, are still necessary. If you have not paid to the LSN network access you can install the rpm oracleasm-taking in charge of the public yum repository for Oracle (http://public-yum.oracle.com/). Use of yum is easy and will also solve package dependency issues.

To install oracleasmlib, you can try:
RPM - ivh "http://download.oracle.com/otn_software/asmlib/oracleasmlib-2.0.4-1.el5.x86_64.rpm."

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Ideas:
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That means recommended recommended for an ASM diskgroup to maintain production database?

Dear Experts,
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recommendation of Oracle asmlib or raw for 11g ASM

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