How to increase space in ASM disk groups?

Hi All,
I am a newbie DBA in my team and today morning got a OEM alert that:
Target name=+ASM_ZEUS.techiebros.com
Message=Disk Group DATA requires rebalance because at least one disk is low on space.
Any solution?

To solve it you can run this command: Alter diskgroup ASMDB Add Disk 'here the way of the new disk' Rebalance power 4 WAIT;
After that, you can see through the v$asm_operation;
Read : <http://jarneil.wordpress.com/2008/10/27/asm-rebalance-io-saturation/> or < http://docs.oracle.com/cd/B19306_01/server.102/b14200/statements_1006.htm>

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How to increase size of a Disk Group in ASM?

Hi,
I'm testing the ASM in AIX. I created a Logical Volume with size is, e.g., 10G. Then I assign this LV with a Disk Group in ASM. Now I increase the size of the LV using AIX's smit, e.g., to 20G. How can I increase the size of my Disk Group in ASM?
I understand that Oracle recommend to assign a whole physical hard disk to a Disk Group in ASM.Thus, the resize command of ASM can only reduce the size of Disk Group, but cannot increase the size of it?
Any advice?
Pham

Disk Group is a logical term, phyical size of a diskgroup is determined by the disks belonging to a diskgroup. So you cannot increase a diskgroup, only the disks in it. You can resize a disk up to its physical limit (resize option of ALTER DISKGROUP statement).
Werner

How do I see the balance of extents within my ASM disk group?

I wanted see if there is a way to see how well the extents ,within a disk group, are balanced across the multiple disks in the group. Does anyone know?

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How to move or migrate whole directories between ASM disk groups?

Hello everyone!
I'm playing around with Oracle ASM and Oracle Database (11g R1), I'm a student. This is just for testing purposes.
Computer specifications are:
Processor: Intel Pentium 4 HT 3.00 Ghz.
RAM Memory: 2 GB.
Hard Disk: 250 GB
O.S.: Windows XP Professional Edition SP 2.
I installed Oracle ASM, I created an ASM disk group (+FRA), I installed Oracle Database and I created a testing database. The database is working properly over the ASM disk group. Days ago, I got help about the initialization parameters DB_CREATE_FILE_DEST, DB_CREATE_ONLINE_LOG_DEST_1, DB_CREATE_ONLINE_LOG_DEST_2 and DB_RECOVERY_FILE_DEST, based on their function, I created another 3 ASM disk groups (+FILES, LOG1, LOG2). Currently, the four initialization parameters are pointing to its corresponding ASM disk group. As you can deduce, at the installation moment of the Oracle Database I used the ASM disk group "+FRA" and inside it were created the directories: CONTROLFILE, DATAFILE, ONLINELOG, PARAMETERFILE, TEMPFILE and the SPFile.
My point is I wanna move or migrate the directories DATAFILE, PARAMETERFILE, TEMPFILE and the SPFile to "+FILES", ONLINELOG and CONTROLFILE to "+LOG1" and "+LOG2", this way, the ASM disk group "+FRA" will contain the Flash Recovery Area only. What is the procedure to do this?
Thanks in advance!

user1987306 wrote:
Hello everyone!
My point is I wanna move or migrate the directories DATAFILE, PARAMETERFILE, TEMPFILE and the SPFile to "+FILES", ONLINELOG and CONTROLFILE to "+LOG1" and "+LOG2", this way, the ASM disk group "+FRA" will contain the Flash Recovery Area only. What is the procedure to do this?
Thanks in advance!
Hi,
There are couple of approaches you can use, here is some of them
- To move datafile, start the database in mount state
RMAN > copy datafile '+FRA/xxx' to '+FILES1';
SQL > alter database rename file '+FRA/xxx' to '+FILES1/xxx';
- To move tempfile
SQL > alter tablespace TEMP add tempfile '+FILES1' SIZE 10M;
SQL > alter database tempfile '+FRA/xxx' drop;
- To move onlinelog
SQL > alter database add logfile member '+LOG1' to group 1;
SQL > alter database add logfile member '+LOG2' to group 1;
SQL > alter database drop logfile member '+FRA/xxx';
- To move controlfile
SQL > restore controlfile to '+FILES1' from '+FRA/xxx';
update the spfile to reflect new location of controlfile
Cheers

EM Alert: Warning:+ASM Disk Group requires rebalance

Environment:
O.S Version : HP-UX B.11.31 U ia64
Oracle DB Version : 11.2.0.3.0 , Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
Database files are on : ASM Disk Group
It is about the ASM Diskgroup low disk space alert by Oracle Enterprise Manager.
Message=Disk Group DG_FLASH_01 requires rebalance because at least one disk is low on space.
Metric=Disk Minimum Free (%) without Rebalance
Metric value=18.961548
Disk Group Name=DG_FLASH_01
Severity=Warning
Target Name=+ASM_dbsrver.siva.com
Target type=Automatic Storage Management
There is only 1 LUN assigned to this diskgroup +DG_FLASH_01_.
We have a Oracle Enterprise Manager Grid Control Job MN_DBSRVR_DEL_ARCHIVELOGS runs every 12 hours by 1 AM and again at 1PM daily. It cleans-up the archivelogs older than 3 days old. The FLASH diskgroup is continuously being written with new files for both archivelogs and flashback logs.
If there was multiple disks and a vast difference between the files on the different LUNs then a rebalance would be good to run.
How to address such recurring alert of " *Disk Group DG_FLASH_01 requires rebalance because at least one disk is low on space*. " with _only one LUN on the +ASM Diskgroup_?

As I stated earlier there is only one disk on this diskgroup
DISK_NUMBER      OS_MB   TOTAL_MB    FREE_MB NAME                           PATH
          0      65536      65536      12995 DG_FLASH_01_0000        /devasm/gc/ora_asm_gc_b03_a14_d10_08_36
          0      65536      65536      43064 DG_DATA_01_0000         /devasm/gc/ora_asm_gc_b03_a13_d12_08_35So disk REBALANCE not required
Edited by: Sivaprasad S on Feb 14, 2013 11:46 PM

Standby Database ASM Disk Groups

Hi Guys
I wonder if anyone can tell me - does a standby database have to have an identical configuration for its ASM Disk Groups?
My production database has two disk groups, one for data and the other for temp. Can I get away with a single diskgroup in my standby database or would I need two of the same name as the production database?
Cheers
Simon

Hi Saml
I have been busy googling at the same time as discussing this and it would appear that it will use the db_file_name_convert:
http://asanga-pradeep.blogspot.com.au/2012/07/11gr2-standalone-data-guard-with-asm.html
The link above shows the output of someones RMAN session where the OMF names are changed automatically. Problem is that some people are recommending that the parameter not be used, so now I am really confused!
I think I will try the parameter, if it doesnt work or the duplicate fails I will drop the temp table space in production and then do the duplicate, then recreate the temp tablespace. I can do that because there will be no one on the system on Sunday when I do it.
Thanks again for your help - I will let you know how it goes.
Ragards
Simon

How to check space on asm and raw device?

Hi All,
I want to know how to check the space on asm device.
we are using asm device which is on raw partition.
Our archive gets full.I need to check the space on asm archve partiotion.
how can i check the archive destination space?
we are using raw device partition for crs and voting device.
how can we check the space on raw device and how can we know which device is in use and which are not in use
Thanks in advance

4 - 5 raw partitions...
What oracle version?
Install OCR + VOTE in raw device better than OCFS2. if you use 10g to 11gR1.
If use 11gR2,keep OCR + VOTE in ASM Disk Group.
you can check which raw device OCR:
$ ocrcheck
VOTEDISK:
$ crsctl query css votedisk
On 10g if use raw device for OCR + votedisk: recommend 1 file = 250M
11g recommend 1 file = 512M
Good Luck

How to query the status of disk groups in specific time?

Dears,
While trying connect to database , i faced ORA-00257:archiver error. Connect internal only, until freed.
Also found in alert file ORA-15041: diskgroup space exhausted
And found in ASM alert file WARNING: allocation failure on disk DG_DATA_0002 for file 357 xnum 2147483648
I expected from above errors that the problem in ASM Disk groups or in file system space.
After checking, found every thing is fine and OK as i have much free space.
And when i tried after some time to connect to database, it connected successfully without errors.
It means that the problem not in space,may be the status of disk groups became invalid for some time
Appreciate your advise. And how can i know the status of disk groups in specific time?
Thanks & Regards,,

Hi All,
We got another idea to create new template and use it as "Current Default Workbook".
Then it is showing latest date as we changed one of the Text element from "Display Status of Data" to "Display status of Data To".
But the this change is showing to my user id only but not to the other users.
We are selecting the tick mark for "Global Default Workbook", but this tick mark is going away after each refresh. I think if this tick mark is holds permanently, my problem will solve.
Please suggest me if you have any ideas to resolve this issue....

Cleaning up ASM disk group after failed rman duplicate session?

I am using rman duplicate to create a clone of a production database. The rman duplicate failed in phase 1 (retoration of datafiles) and my datafile are being restored to an ASM diskgroup.
I read in the metalink note Manual Completion of a Failed RMAN Duplicate [ID 360962.1] the following...
Note : From 10g onwards, if duplicate failed during step 1, which is the restore of datafiles, it is probably best to restart the duplicate process. Any files that have already been restored will be skipped and the duplicate process can continue without manual intervention
So I followed the advice in the note and started the rman duplcate script over again from the beggining. I am hoping it will have the intelligence to skip any files that have already been restored but if it is not since this is 10.1.0.3 and I cannot use the asmcmd command to connect to the ASM instance to delete any files that have been created then how can I delete and of the files since the database instance never got created correctly and cannot open?
Any thought on how I can now cleanup the files in the ASM disk group? Also, has anyone started an rman duplicate again after it has previously failed and did it actually skip the files that are already there as stated in the metalink note?
Thanks.

Unfortunately the v$asm_file does not have the entire file name or path it just gives you the follwing...
SQL> desc v$asm_file
Name Null? Type
GROUP_NUMBER NUMBER
FILE_NUMBER NUMBER
COMPOUND_INDEX NUMBER
INCARNATION NUMBER
BLOCK_SIZE NUMBER
BLOCKS NUMBER
BYTES NUMBER
SPACE NUMBER
TYPE VARCHAR2(64)
REDUNDANCY VARCHAR2(6)
STRIPED VARCHAR2(6)
CREATION_DATE DATE
MODIFICATION_DATE
This really stinks I wish I didn't have to work with 10gr1 at all but the database I am trying to move to a ew server and new storage is running this version and we did not want to upgrade the existing database first before attempting the migration because it is reliant upon tape backups which I do not have alot of confidence in...

How to move Tablespace from One disk group to another disk group in RAC

Hi All,
I have 11gR2 RAC env on Linux.
As ofnow I have problem with disk group. I have 3 disk group which is almost full - 98%. I have added one NEW disk group and want to move some of the Tablespace(TBS) from OLD disk group to NEW diskgroup and make some free space in OLD disk group.
Can any one suggest me how to move TBS from one disk group to another disk grup without shutting down the instance.
DB is in Noarchive mode.
Thanks...

user12039625 wrote:
Hi Helios,
Thanks for doc id but I am looking for noarchive mode solution. becaues I got ORA-
"ORA-01145: offline immediate disallowed unless media recovery enabled " when run alter database datafile '...' offline.
Hence I am trying something and findout below steps but not sure how useful it is:
1- put tablespace offine
2- Copy the file to new diskgroup using Either RMAN or DBMS_FILE_TRANSFER.
3- Rename the file to point to new location.
4- Recover the file.
5- Bring the file online.
I had move 240M TBS from OLE to NEW.
These steps run successfully so I think this is valid for noarchive mode.Hence want to confirm..so inform me please.
Thanks :)I have doubt in my mind:
1. You database is in noarchivelog mode
2. You're taking tablespace offline
3. Suppose you're moving a file of size 10GB(or any larger filesize) to another disk group
4. Now after moving the file, you're trying to bring the tablespace online............NOW
tablespace will need recovery. if the required data is inside the SGA then it is ok. But if the data has been flushed, then?
if step 2 and 3 has taken significant time, then most probably you'll not be able to bring that tablespace online.
Regards,
S.K.

Difference between ASM Disk Group, ADVM Volume and ACFS File system

Q1. What is the difference between an ASM Disk Group and an ADVM Volume ?
To my mind, an ASM Disk Group is effectively a logical volume for Database files ( including FRA files ).
11gR2 seems to have introduced the concepts of ADVM volumes and ACFS File Systems.
An 11gR2 ASM Disk Group can contain :
ASM Disks
ADVM volumes
ACFS file systems
Q2. ADVM volumes appear to be dynamic volumes.
However is this therefore not effectively layering a logical volume ( the ADVM volume ) beneath an ASM Disk Group ( conceptually a logical volume as well ) ?
Worse still if you have left ASM Disk Group Redundancy to the hardware RAID / SAN level ( as Oracle recommend ), you could effectively have 3 layers of logical disk ? ( ASM on top of ADVM on top of RAID/SAN ) ?
Q3. if it is 2 layers of logical disk ( i.e. ASM on top of ADVM ), what makes this better than 2 layers using a 3rd party volume manager ( eg ASM on top of 3rd party LVM ) - something Oracle encourages against ?
Q4. ACFS File systems, seem to be clustered file systems for non database files including ORACLE_HOMEs, application exe's etc ( but NOT GRID_HOME, OS root, OCR's or Voting disks )
Can you create / modify ACFS file systems using ASM.
The oracle toplogy diagram for ASM in the 11gR2 ASM Admin guide, shows ACFS as part of ASM. I am not sure from this if ACFS is part of ASM or ASM sits on top of ACFS ?
Q5. Connected to Q4. there seems to be a number of different ways, ACFS file systems can be created ? Which of the below are valid methods ?
through ASM ?
through native OS file system creation ?
through OEM ?
through acfsutil ?
my head is exploding
Any help and clarification greatly appreciated
Jim

Q1 - ADVM volume is a type of special file created in the ASM DG. Once created, it creates a block device on the OS itself that can be used just like any other block device. http://docs.oracle.com/cd/E16655_01/server.121/e17612/asmfilesystem.htm#OSTMG30000
Q2 - the asm disk group is a disk group, not really a logical volume. It combines attributes of both when used for database purposes, as the database and certain other applications know how to talk "ASM" protocol. However, you won't find any general purpose applications that can do so. In addition, some customers prefer to deal directly with file systems and volume devices, which ADVM is made to do. In your way of thinking, you could have 3 layers of logical disk, but each of them provides different attributes and characteristics. This is not a bad thing though, as each has a slightly different focus - os file system\device, database specific, and storage centric.
Q3 - ADVM is specifically developed to extend the characteristics of ASM for use by general OS applications. It understands the database performance characteristics and is tuned to work well in that situation. Because it is developed in house, it takes advantage of the ASM design model. Additionally, rather than having to contact multiple vendors for support, your support is limited to calling Oracle, a one-stop shop.
Q4 - You can create and modify ACFS file systems using command line tools and ASMCA. Creating and modifying logical volumes happens through SQL(ASM), asmcmd, and ASMCA. EM can also be used for both items. ACFS sits on top of ADVM, which is a file in an ASM disk group. ACFS is aware of the characteristics of ASM\ADVM volumes, and tunes it's IO to make best use of those characteristics.
Q5 - several ways:
1) Connect to ASM with SQL, use 'alter diskgroup add volume' as Mihael points out. This creates an ADVM volume. Then, format the volume using 'mkfs' (*nix) or acfsformat (windows).
2) Use ASMCA - A gui to create a volume and format a file system. Probably the easiest if your head is exploding.
3) Use 'asmcmd' to create a volume, and 'mkfs' to format the ACFS file system.
Here is information on ASMCA, with examples:
http://docs.oracle.com/cd/E16655_01/server.121/e17612/asmca_acfs.htm#OSTMG94348
Information on command line tools, with examples:
Basic Steps to Manage Oracle ACFS Systems

Oracle ASM disk group

Hi,
Having a multiple Oracle ASM disk group is more beneficial for Oracle database? if no why? if yes why?
Any metalink note if have.
thanks

Any metalink note do you refer?What is your database version?
Please see these docs.
11g ASM New Feature [ID 429098.1]
ASM 11g New Features - How ASM Disk Resync Works. [ID 466326.1]
Thanks,
Hussein

Share an ASM disk group among multiple nodes

According to Oracle documentation:
*“To share an ASM disk group among multiple nodes, you must install Oracle Cluster ware on all of the nodes, regardless of whether you install Oracle RAC on the nodes”.*
And if I understand it right to share the same ASM storage group from multiple nodes from separate RACs or multiple non-RAC nodes ASM instances in those nodes need to communicate to synchronize ASM related metadata using same technique like cache fusions.
My question is how this ASM communication take place among different ASM instances located in different RACs and standalone servers. Do we have to have some kind of Interconnect settings among the nodes?

Hi,
ASM and database instances require shared access to the disks in a disk group. ASM instances manage the metadata of the disk group and provide file layout information to the database instances.
ASM instances can be clustered using Oracle Clusterware; there is one ASM instance for each cluster node. If there are several database instances for different databases on the same node, then the database instances share the same single ASM instance on that node.
If the ASM instance on a node fails, then all of the database instances on that node also fail. Unlike a file system failure, an ASM instance failure does not require restarting the operating system. In an Oracle RAC environment, the ASM and database instances on the surviving nodes automatically recover from an ASM instance failure on a node.
see this link
http://download.oracle.com/docs/cd/B28359_01/server.111/b31107/asmcon.htm :)

Recover OCR and VOTE disk after complete corruption of ASM disk groups.

Hi Gurus,
I am simulating a recovery situation to perform recover of OCR and Vote files after complete corruption of ASM related disks and diskgroups. I have setup my environment as follows:\
Environment: RAC
OS: OEL 5.5 32-bit
GI Version: 11.2.0.2.0
ASM Disk groups: +OCR, +DATA
OCR, Vote Files location: +OCR
ASM Redundancy: External
ASM Disks: /dev/asm-disk1, /dev/asm-disk2
/dev/asm-disk1 - mapped on +OCR
/dev/asm-disk2 - mapped on +DATA
With the above configuration in place I have manually corrupted +OCR, +DATA diskgroups with dd command. I used this command to completely corrupt +OCR disk group.
dd if=/dev/zero of=/dev/asm-disk1. I have manual backups as well as automatic backups of OCR and Vote disk. I am not using ASMLib.
I followed this link:
http://docs.oracle.com/cd/E11882_01/rac.112/e17264/adminoc.htm#TDPRC237
When I tried to recover OCR file, I could not do so as there is no such diskgroup which ASM can restore the OCR, Voting disk to. I could not Re-create OCR and DATA diskgroups as I cannot connect to ASM instance. If you have a solution or workaround for my situation please describe it. That will be greatly appreciated.
Thanks and Regards,
Suresh.

Please go through the following document which have the detailed steps to restore the OCR
How to restore ASM based OCR after complete loss of the CRS diskgroup on Linux/Unix systems [ID 1062983.1]

ASM DISK groups set up at O/S level

Hi
I am having couple of questions regarding the ASM.
I was given LINUX Server and asked me to create the ASM DISK groups at O/S level.
Oracle version: Oracle 11g realease 2 with ASM and Stand alone server
O/S: Redhat Lilnux with 64 bit
1.Unix admin has already given the server and gave me the root access also.Now I need to map/set up the ASM DISK groups manually and create them at the O/S level and then INSTALL the ASM software.
a)We are using the asmlib for mapping at o/s level.Can any body give the command to know whether asmlib was installed on the Linux server.
b)How to see the free Partitions on the Linux server and allot them to ASM disks at O/S level and to create it.
2)Should I use two separate users ie . one for Grid infrastructure(Asm) and other for RDBMS Installation.
Say GRID user for Grid Infrastructure(Asm) and ORACLE user for RDBMS Installation.
If so what is the advantage in using different users for ASM and RDBMS installation respectively.
The grid user is a member of these OS groups :asmdba,asmoper, and asmadmin and not dba group
The oracle user is a member of these OS groups :dba and asmdba groups.
ofcourse grid user and oracle user is also a part of oinstall group.
Please find the url which I picked the above information.
http://levipereira.wordpress.com/2010/11/21/installing-the-grid-infrastructure-for-a-standalone-server/
Thanks in advance
Thanks
Veera

First of all you should be using installation guide from oracle which you can find at ..http://www.oracle.com/pls/db112/portal.portal_db?selected=11&frame=
If so what is the advantage in using different users for ASM and RDBMS installation respectively.There are two things, Grid & Database, Oracle wants to separate the administartion for both software, where users who are DBAs should not be allowed to change ASM stuff and vice-versa.
You can use fdisk command to partition the disks, and use # /usr/sbin/oracleasm createdisk command to create the disk.

How to increase space in ASM disk groups?

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