You would rely on external redundancy for ASM?

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• If you use network storage, configure ASM disks with external redundancy groups

  Hi Experts,

  If you use network storage, configure ASM disks with external redundancy groups. Don't use groups of Oracle ASM failure. Oracle failure groups consume cycles additional CPU and can run in unpredictable ways after suffering from a disk failure. When you use external redundancy, disk failure are transparent to the database and do consume no additional database CPU cycle, because it is discharged on storage processors.

  This does not mean

  • RAID 1 + 0 for diskgroup + REDO1
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  • RAID 5 for diskgroup + DATA
  • RAID 5 for diskgroup + FRA

  Is this one suggested, the recommended best practices for oracle on VMWARE?

  
  

  Thank you and best regards,

  IVW

  
  

  Hello

  You can check the storage analysis as well...

  http://www.Dell.com/downloads/global/solutions/tradeoffs_RAID5_RAID10.PDF

  discussion of the Oracle

  https://asktom.Oracle.com/pls/asktom/f?p=100:11:P11_QUESTION_ID:359617936136

• ASM external redundancy and the number of disks

  Hello
  
  
  We are about to install a solution RAC on IBM AIX 5.3 LPAR and VIO.
  According to Oracle certification, we are forced to use DSO (11 g) for storage.
  Because we have a huge SAN solution for all our systems, also the installation of the DSO will run on the SAN
  The complete SAN is in a RAID5 or RAID10 configuration. This automatically means that we will use external redundancy
  The database that will be placed on the system is currently around 50 GB in size.
  
  Now that you guys and women think how to set start, if
  
  one)
  We set up initially only 1 disc in the diskgroup to 60 GB for example,
  ASM does support the ability to increase a logical disk, because we are currently used, using the VIO Server?
  If it is not supported there so if the diskgroup needs to be extended, add another disk the same size, or we can add disks with smaller sizes
  
  (b)
  We set up initially more discs of small size in the diskgroup, making a total of 60 GB
  ASM will probably begin the distribution of the data on the three disks.
  Overhead that does?
  That this has a negative impact, because the three logical drives are already in a striped solution (RAID10)?
  
  
  (If the extension of the logical drive using the VIO in Setup a) only supported, automatically end up in b).
  But I would like to know head/experiences and advice.
  
  Thanks in advance
  
  FJF

  You can increase the size of the logical unit number, which is a Member
  ASM diskgroup, after that, to increase
  the disk partition of this LUN to cover the new size of this LUN,
  and the last step is to tell ASM this member disk has been resized
  "alter diskgroup resizing disk.

• Oracle ASM normal, high and external redundancy

  Hello

  I have some doubts in the levels of normal, high, and external redundancy in the concept of the DSO.

  External - any group fail. No mirroring.

  Normal - two way mirror. Group of failure.

  Top - three way mirror. Group of two failed.

  1. I hope that my understanding on above mentioned 3 types in good.

  2. my main question is what is the minimum number of disks required for the establishment of normal and external redundancy disk group? We cannot create disk group with the members of a single disc?

  Kind regards

  007

  Normal - two way mirror. Group of failure.

  Top - three way mirror. Group of two failed.

  This is false. You need at least two failure for normal and three groups of failure for high redundancy.

  By default, each disk or logical unit number is a group of default, but you can also add more drives to the same group of interlacing of the installation failure. The configuration depends on material available, disk space requirements and the needs of redundancy. ASM provides redundancy between groups of failure.

  Remember that ASM is not disk mirror. It is not RAID. ASM from mirrors of the level and allocation of file units. He knows about Oracle database files and can therefore use optimum and variable block sizes based on the patterns of files. You can add and remove disks to reconfigure your drive grouips online without having to re - initialize your storage, which you can not do with RAID or external redundancy.

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  Is there a way to devote space for ASM to create a database under the DSO?
  
  I was hoping I wouldn't have to reinstall the operating system Linux Enterprise 5 (Red Hat). So I uninstalled my environment RAC 2 nodes, installed required ASM RPM for Red Hat linux Enterprise 5 and then reinstall 11 g Clusterware and set "configure Automatic Storage Management (ASM).
  
  I missed something? Thank you

  Hello

  I recommend you to visit http://www.oracle.com/technology/pub/articles/wartak-rac-vm.html or http://www.oracle-base.com/articles/11g/OracleDB11gR1RACInstallationOnLinuxUsingNFS.php

  They are good examples to configure RAC

  In your example: you will only use ASM for DATDISK and OFRDISK.

• What is the best solution when my external drive for Time Machine is full?

  Hello

  I use the latest version of Mac OS X on my iMac 27 ". I use a drive outside of 3 TB G-Tech for Time Machine backup. Due to my recently many RAW photo images, I have less 8% left storage on my external hard drive, so I'm trying to figure out next steps in what concerns the strategy of external storage and have the following questions:

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  I realize that my first two questions are rather basic, but I don't want to make any false assumptions. The third idea is intriguing and I would like to know if this is a viable option.

  Thank you

  Brian

  older files are starting to get deleted because the disk fills up then Yes, they went

  the backup drive should ideally be 4 times the capacity of your current drive, twice is good but has its limits. Also factor in what you store: a jpeg from the web and a raw photo file are the two images, the size of a is very different. If you work in high-resolution or large native files, or audio files (record pro, no music files) or video production twice the disk fills up very quickly. If you collect photos and JPEG and mp3 files or a handful of videos not so much is necessary.

  I would keep the old drive intact if you want to replace and start over with a new drive, if that's the plan. You have the old data, you can keep it somewhere safe and have a redundant backup which you can reconnect at any time to restore from. Let the new index drive itself with new data and take if from there, in the case otherwise you can copy the backup to the new drive and set the drive as the new source of backup but personally I wouldn't copy of the data, that's my preference, it may not be yours and that's fine.

• How to avoid the brain while using external redundancy.

  Hi all

  When Oracle creates disk to vote who is in external redundancy he writes only in a single drive even if we provide 3 disks for the disk group. In this scenario, what will happen during the expulsion of node. Is there a scenario of split brain.

  Ajay

  Ajay Vijayan wrote:

  I would like to know more about it. How do the multiple vote available in external redundancy disk?

  You can not. If you want three voice files, use a group configured for normal redundancy.

• Prepare disks for ASM (data files and FRA)

  I intend to place data files on a disc 1 (sd1) and disk2 (PSD) when the backup of files (FRA) on disk3 (SDC). Here's how I'd do:
  
  For data files
  Disk1 is divided into a single primary partition (with native Linux what ID 83 not formatted system)
  Disk2 is also divided into a single primary partition (with native Linux ID 83 system not formatted)
  
  oracleasm createdisk vol1/dev/sda1
  oracleasm createdisk vol2/dev/sdb1
  
  CREATE DISKGROUP DATA EXTERNAL vol1, vol2 REDUNDANCY;
  
  
  For backup FRA
  
  Disk3 is partitioned into four primary partitions: / Boot (ext3), / (ext3), swap (swap) and /u01 (ext3)
  
  The FRA will be put under the/U01 and then attend the ASM:
  
  oracleasm vol3/dev/sdc4 createdisk
  CREATE DISKGROUP DATA EXTERNAL vol3 REDUNDANCY;
  
  Now, the problem. (1) the/U01 has already be formatted in ext3; (2) Oracle (DBMS) software will also be place under/U01
  
  It will be a problem?
  
  
  Otherwise, I can put FRA on the same drive as the data files, i.e. on disk1 and disk2. In this case, I need to partition the disk 1 in two primary parititions sda1 and sda2 (native Linux system ID 83 not formatted), one for data files and another for FRA (do the same for disk2). The downside is that the data file and the file recovery will be on the same hard drive.
  
  
  Please offer some suggestions.
  
  
  Thank you
  
  Scott
  
  PS: in the environment of production, all the disc 1, 2 and 3 will be on hardware RAID 1.

  RAID 1 will protect you only a device failure. It won't protect you partition, the file damage system or user errors; It will be in the image of the errors and problems like any other data.

  So what happens if you delete by mistake / U01 or some other accident happens and you loose that partition? With your current setup, you will lose everything and will not be able to restore or recover the database. Put tablespaces FRA and DB on the same physical device is certainly a very bad idea, whether or not it is a RAID.

  ASM is not a software RAID 1 mirror. It ensures redundancy of data based on file extensions and knows about files of Oracle database, which is a very good thing. You probably do not want to specify 'external redundancy.

  In a production system, you'll certainly want to mux the critical data and to store the DB controlfiles, redo logs and finally archivelogs on media separate physically in order to avoid the single point of failures wherever possible. You can use partitions and volumes in ASM, but they should be separate physical drives, otherwise you will bypass the ASM data redundancy. You must also have a solid strategy for RMAN backup. The FRA is supposed to store backupsets RMAN, copies of the image, the important archivelogs and multiplexes of the copies of the database files and should therefore always on a separate physical disk.

  Unless you simply play, I strongly suggest that review you your current configuration.

  Published by: Dude on June 29, 2012 04:55

• Creating DAS or SAN Disk Partitions for ASM

  Oracle® database Installation Guide 11 g Release 2 (11.2) for Linux (http://docs.oracle.com/cd/E11882_01/install.112/e24321/oraclerestart.htm#CHDBJGEB)
  
  * 3.6.3 step 2: * creating DAS or SAN Disk Partitions for Oracle Automatic Storage Management
  
  In order to use Oracle ASM a DAS or SAN disk, the disk should have a partition table. Oracle recommends to create a single partition for each drive.
  
  
  My question: why Oracle is recommended to create a single partition for each disc? For a disk to use on Suse Linux, I normally need at least 3 partitions, i.e., boot, swap and root.
  
  
  
  Scott

  These scores are for your operating system. Partitioning of a data disc is not very conducive to the continuation of the salary plan. Redundancy function what sense does make having 2 mirrors on 2 partitions on the same drive... When the disc goes down, you're toast. How you run your last command "Edit CV update s/n"

  As for the score, he should start cylinder 2 through . Crush the first 1 M drive will overwrite the table to partition and in the case of Solaris, the VTOC. (Virtual table) Without the VTOC table or partition, your device becomes a useless brick.

  If you have only a single disc, then ASM is not a storage solution that I would sue. You need a device for performance benefits.

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