ASM configuration on AIX

Hi all,
I'm trying to find a best practice, or set of recommendations on installation/using 11g ASM on AIX 5.3L and thought I'd seek some feedback as I've been unable to get such information via searching. The SysAdmin team has the following concerns to which I'd greatly appreciate your experience and guideances:
1. LVM - They would like to use LVM per normal, though the recommendation is against this due to performance and unnecessary overlap (another layer). Any experiences, or guidance on this implementation?
2. PVID - They understand that ASM will overwrite the disks and as such an initial tagging with PVID will get overwritten. Is there anyway they can use a PVID or some other method to tag the disks regardless? They are seeking to maintain current SANCopy (EMC Clariion/Symmetrix) practices and tags make it a lot easier for them it seems.
3. Block vs. raw devices - Our recommendation was to use raw devices (faster), so I'm really looking for an explanation/confirmation of what they've presented below:
brw-rw---- 1 oracle dba 41, 1 Mar 27 14:26 /dev/asm_sandyxi_0
brw-rw---- 1 oracle dba 42, 1 Mar 27 14:25 /dev/asm_sandyxi_1
brw-rw---- 1 oracle dba 43, 1 Mar 27 14:29 /dev/asm_sandyxi_2
brw-rw---- 1 oracle dba 44, 1 Mar 27 14:30 /dev/asm_sandyxi_3
crw-rw---- 1 oracle dba 41, 1 Mar 30 12:06 /dev/rasm_sandyxi_0
crw-rw---- 1 oracle dba 42, 1 Mar 30 12:05 /dev/rasm_sandyxi_1
crw-rw---- 1 oracle dba 43, 1 Mar 30 12:06 /dev/rasm_sandyxi_2
crw-rw---- 1 oracle dba 44, 1 Mar 30 11:41 /dev/rasm_sandyxi_3
The /dev/rasm* are what ASM is detecting being available for use, so my assumption is that this is normal/expected behavior as the SysAdmins have created raw devices on top of the block devices. Is this accurate?
4. Documents - I've tried searching but can't locate ASM (11g) on AIX (5.3L) best practice documents. Is ASM used/recommended on AIX really? My searching thus far has not shown a lot of deployments which would seem to indicate it is not a favored platform.
Any help is really appreciated.

1) as far as I know, there is no restriction to use LV with ASM ; moreover this is the only way if you use HACMP.
2) PVID :
If a PVID assigned disk is added into an ASM diskgroup, ASM will overwrite the PVID with its ASM disk header => on next reboot, the OS, in coordination with the ODM database, will restore the PVID onto the disk, thus destroying the ASM disk and potentially resulting in data loss.
3) Yes. This is the way it must be.

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Hello All,
I had successfully installed and configured ASM instance once, but I need to do a reinstallation and I would like to use the same disk (partition) as with previous ASM configuration.
The disk path used was: /dev/rdsk/c1t3d0s7
I have to regretfully admit that I may not have used the right ASM un-installation procedure. I ran installer and opted to de-install products. Consequently, I had removed ASM home. Now, when I running new ASM installation, everything goes fine until the screen where I should select disks for ASM configuration. Unfortunately, I see the /dev/rdsk/c1t3d0s7 with status > MEMBER < and I can't select it for the new ASM installation.
I will really appreciate if anyone can let me know how to change status from MEMBER to CANDIDATE.
Thank you for your time.
DanielD

Overwrite the first several MB of the partition with /dev/zero.
So, use this command:
# dd if=/dev/zero of=/dev/rdsk/c1t3d0s7 bs=1024k count=10
That clears out the ASM header on the disk so that it looks like a clean disk again.
-- John

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

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raitsarevo

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there's no extra RAC software package, but the option is only offered, if one of the supported cluster layers for the respective OS has been installed before.
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Hi Everybody,
My question is:
Is it possible to configure ASM using shared file system on RAC other than configuring raw devices . If it so how to do it?
Environment:
OS: Sun SPARC Solaris 10
SUN Servers:V490
Number of Nodes: 2
Storage Server:3150
Switches:SAN
RDBMS: Oracle 10.2.0 RAC
Clusterware: Configuring Raw Devices for OCR and Voting Disk.
How to configure ASM on Shared Storage for database files as we are not using Third party clusters?
What are the possible storage options for ASM as per my requirement?
I seen in document it is very dfficult to manage and administure ASM configured using RAW Devices?
in both the cases kindly provide me steps how to do it by using DBCA.
Is it necessary to use recovery area on ASM?
Waiting for your favourable reply from RAC experts.

Hi,
Steve Karam has some great notes on this:
One thing to remember is that ASM is not RAID. Oracle portrays ASM as a Volume Manager, filesystem, miracle, whatever you would like to call it, but in reality it is no more than extent management and load balancing; it scatters extents across your LUNs (1MB stripe size for datafiles/archivelogs, 128k stripe size for redo/controlfiles). It also provides extent-based mirroring for extra redundancy.
This benefits us in a couple ways. First, remember that your OS, HBA, or other parts of the host driver stack may have limits per LUN on I/O. Distributing your extents across multiple LUNs with ASM will provide better I/O concurrency by load balancing across them, eliminating this bottleneck.
Second, carving into multiple LUNs allows multiple ASM volumes. Multiple volumes help us if our hardware has any LUN-based migration utilities for snapshots or cloning.
Third, you may end up with multiple LUNs if you need to add capacity. ASM allows us to resize a diskgroup on-the-fly AND rebalance our extents evenly at the same time when we add a new LUN. Even if you only start with a single LUN, you may end up with more in the long run.
Fourth, because an ASM diskgroup is not true RAID, you are able to use it to stripe across volumes. This means that in a SAN with 3 trays, you can carve a LUN from each tray and use it to form a single ASM diskgroup. This further distributes your storage and reduces throughput bottlenecks.
I have not seen any tried and true formula for the number of LUNs per ASM diskgroup, but you can calculate it based on your throughput per capacity. Make sure the LUNs provide maximum and equivalent I/O operations per second per gigabyte.
http://www.dba-oracle.com/t_disk_lun_san_nas_performance_bottleneck.htm

Cloning the asm configured database

Hi all DBA Guys, Have a Nice Day For all
How to cloning the asm configured database?
Regards
S.Azar

Hi,
How to cloning the asm configured database?
The same way which you going to use for without ASM instance.
Nice day to you too. :)

Oracle database 10g RAC and ASM configuration

Hi all,
I want to ask to everybody something about Oracle 10g RAC and ASm configuration. We plan to migrate to Oracle 10g from 9i, and we will begin configuring oracle but we have to decide which configuration are the best.
Our materials are bellow:
Hardware: RP 3440 (HP)
OS : HPUX 11i Ver 1
Storage: EVA 4000 (eva disk group)
The problem is:
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Can we use HP serviguard and ASM.
Some documentations or link explain oracle RAC and ASM configuration will be appreciate.
Thanks for your help.
Regards.
raitsarevo

Hello,
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ASM Configurations

Hi,
I am new to configuring ASM,
Can you tell me how to start from scratch like what kind of disks required. which raid level should be configured, which one is the task of sysadmin and which tasks will be performed by dba?
My operating system is solaris 9 x86 and database would be 10gR2.
We are going to deploy data warehouse environment.
alomost 100gb RAM is available (expectedly from 80gb to100gb ram).
please help me understanding the ASM configuration and disks knowledge along with RAID levels.
Note: we have 600GB hard disk (6 disks 100gb each).
Thanks all........
Message was edited by:
Fkhalid

Have a lok at ASM Best Practice Documents
www.oracle.com/technology/products/database/asm
www.oracle.com/technology/products/database/asm/pdf/asm_10gr2_bptwp_sept05.pdf
www.oracle.com/technology/products/database/asm/pdf/asm_bestpractices_9_7.pdf

Silent install- ASM Configuration Assistant fails

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If I look at the "custom" install option it shows the ability to "configure for ASM" but I'm thinking that option would be used to configure an instance to USE an already up and running ASM instance.
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On the initial screen choose those options that say "Advanced" or "Software Only" or similar things: It is there.

11r2 asm configuration on HACMP

Hi ,I have already configured 11gr2 asm setup on my one server.
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Requirement :Set up will look like :
IBM aix 7.1 HACMP active passive cluster with common asm storage

Thank u very much for response ,,
During first installation on node1 i chose +DISK1 for ASM SPFILE .
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4.When 1st node will b down then who will come to knw that instance should be started on 2nd node and who will do this ?
Kindly answer.........

Windows File Share configuration from AIX Portal

Hi,
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Hi,
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ASM Configuration on oracle 10.2 RAC

hi all
os : sun sparc solaris 10
db : 10.2 rac database
clusterware configured using raw devices.
we have no other option than configuring asm on raw devices.
could u tell me narrows steps how to do it manually as well as using dbca

Hi
I've do mine last week but it's in HPUX not sun and not with raw device but i think it's the same
Steps:
1- Launch dbca
2- Choose configure ASm
3- Select all the nodes
4- Choose Create Initiialization parameter file and click on ASM parameters and in the asm_diskstring parameter specify the disk you want to use in asm group example
vg01/vol1,vg01/vol2, ... Don't specify first the disk group
5- Create new disk group
6- choose the disk candidate for the group
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regards raitsarevo

The ASM configuration

dear team,
i have been working on migrating my DB to ASM and while i was configuring ASM i got the following issues.
1- when i have to prepair the disk i used fdisk tool to make the filesystem table and then save the configuration for each disk. "do i have to use mkfs tool after that"
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3- for the DBCA to be able to see the disks, i have to change the permission of the disk to 666 using chmod command.. but when i restart the system, these permission just return back to the old value(NOT 666) nwhich makes it impossible to start the ASM instance.
4-Do i have to use scsi disks for ASM or i can use IDE disks too. if yes please tell me how...
thank u in advance.

Overwrite the first several MB of the partition with /dev/zero.
So, use this command:
# dd if=/dev/zero of=/dev/rdsk/c1t3d0s7 bs=1024k count=10
That clears out the ASM header on the disk so that it looks like a clean disk again.
-- John

ASM Configuration on Solaris

Hi,
I want to configure ASM on Solaris Oracle sparc-64 bit server with Netapp storage.
I am bit confused, when to create diskgroup using asmca. Because there is no asmlib package available. I cannot start grid installation because during installation it asking for disk (which i want to use from shared storage diskgroup).
Yuvraj

You should read the installation REQUIREMENTS for the platform you are using. You do NOT need to follow some other document to "mark" the devices for ASM. It is not necessary. I have NEVER done this, nor have I EVER used asmlib on Linux. IT IS NOT NECESSARY!!!!!!! Read the Oracle docs.
have sys admin configure devices to be visible for all nodes (stand-alone or cluster)
Make sure you use fdisk and use a partition that excludes the first 2 cylinders (0-1). Your partitions should start at cylinder 2. If you do not, ASM will overwrite the Solaris VTOC for the device rendering it unusable until you correctly partition the devices. The device should only have 2 partitions. Partition 1 is cylinder 0-1, and Partition 2 is cylinders 2-<last>. All ASM disks in a given DISKGROUP need to be EXACTLY the same size. You can have multiple diskgroups with different size devices, but that just makes managing your devices more complicated. A word of warning, in 11gR2, if you use a diskgroup with EXTERNAL REDUNDANCY, you will only get 1 voting file. The recommendation for a CRS diskgroup is to be made up of 3 x 2G devices for OCR/VOTING with NORMAL redundancy. This will create 3 voting files.
set correct ownership of grid:oinstall (or whatever:whatevergroup) for only partition 2 of these devices
Next make sure the grid user and the oracle rdbms user can both READ and WRITE to these partitions (rdbms user must be a member of the oinstall/whatever group).
during the install, make sure you change the ASM_DISKSTRING to point to these devices:
eg: /dev/whatever*p2. The installer will then mark the devices properly and create the diskgroup(s)
I don't know why so many people make this so hard. It is NOT that hard!!!!!
[Frame of reference: I have installed > 75 10g-11gR2 clusters.]
Edited by: onedbguru on Dec 9, 2012 1:12 PM

ASM configuration on AIX

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