Half Rack exadata with DBFS_DG have normal redundancy?

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• 11 GR 2 Grid Infrastructure install - with normal redundancy ASM disk group requires 3 disks?

  
  Hello

  I want to install 11 GR 2 grid Infrastructure in a new environment in cluster - 2 nodes). I use the 11.2.0.4 GI Installer on Oracle Linux 6.5 x 86-64

  However when it is in the installer of GI, it comes to choose the storage Option - I choose ASM disk groups.

  Then change the path of discovery to pick up my candidate ASM disks.

  I enter the disk group name SIR give Normal redundancy, choose 2 discs of candidate and then press < next > to Setup.

  However, I gives me the message

  [INS-30510] Insufficient number of ASM disks selected

  The number of selected disks was inadequate for the level of redundancy selected

  For a disk group with redundancy level "Normal" disks at least "3" are recommended

  I always thought that Redunancy Normal required only 2 discs and high redundancy requires 3 disks?

  No idea what is gpoing?

  Thank you

  Jim

  Consult the following notes for how to move:

  Note 1638177.1 and 428681.1

  Concerning

  Thomas

• Is this normal in "normal redundancy?

  The GI version: 11.2.0.4 (RAC 3-node)

  OS: Oracle Linux 6.4

  Storage EMC Symmetrix VMAX

  I created a diskgroup with normal redundancy as shown below.

  10 each = 5000GB 500 GB LUN

  CREATE DISKGROUP DATA_DG1

  NORMAL REDUNDANCY

  DISC

  "ORCL:DATA_D1,"

  "ORCL:DATA_D2,"

  "ORCL:DATA_D3,"

  "ORCL:DATA_D4,"

  "ORCL:DATA_D5,"

  "ORCL:DATA_D6,"

  "ORCL:DATA_D7,"

  "ORCL:DATA_D8,"

  "ORCL:DATA_D9,"

  'ORCL:DATA_D10 '.

  ATTRIBUTE 'au_size' = "4 M";

  DiskGroup created.

  Given that it was normal, I was expecting half of gross space 5000 GB = 2.5 terabytes of usable space. But, the query below shows the output, I myself only 2.19 terabytes of usable (2249,86 GB) space. About 250GB short of what I expected. So where's my advantage 250 GB?

  SQL > select name, TYPE, 1024/1024/TOTAL_MB, FREE_MB/1024/1024, USABLE_FILE_MB/1024/1024 of v$ asm_diskgroup where name = 'DATA_DG1 ';

  NAME TYPE TOTAL_MB/1024/1024 FREE_MB/1024/1024 USABLE_FILE_MB/1024/1024

  ------------------------------ ------ ------------------ ----------------- ------------------------

  NORMAL DATA_DG1 4.8828125 4.8825531 2.19713593

  The amount of usable file space is equal to the amount of free disk space subtracted from the amount of disk space required to restore redundancy after failure divided by the level of redundancy of the disk group that is in your case.

  Run:

  select trunc((free_mb - required_mirror_free_mb) / 2) as useable from v$asm_diskgroup where name='DATA_DG1';
  

  Source: http://prutser.wordpress.com/2013/01/03/demystifying-asm-required_mirror_free_mb-and-usable_file_mb/

• Normal redundancy and physical disks

  Version of the grid: 11.2.0.3
  Platform: Oracle Enterprise Linux 6
  
  
  I'm a bit confused about the term "Two-way mirrored" in the documentation of the DSO.
  
  
  If I want to keep 1 tera bytes of business data in an ASM diskgroup with NORMAL redundancy.

  Should I need 2 physical Disks of 1TB each ?
  or 
  Should I need 3 physical Disks of 1TB each ?

  ASM is not a software RAID. ASM works based on file extensions and provides data redundancy by using the free space on drive failure of disk groups. By default, each disc is a group of failure. For a mirror (normal) 2 channels, you need at least 2 rupture discs groups; for the 3 - way (top), you need at least 3. You can also create a 2-way mirror with 3 drives, in which case data will be written alternating. Having ASM normal redundancy in your example you must have at least two drives of 1 TB, but you can also use 3 and will have more space. You can also use an external RAID and use no redundancy ASM (external), although ASM will give you better performance and flexibility because you can add disks to increase the space without having to rebuild your storage space.

• How to combine left half a clip with right half another

  My situation; I'm filming me as 2 characters in 1 shot.  I have 2 clips with the same game.  In a clip, I am sitting on the left, in the other, I sat to the right.  I would like to combine them into a single element where half a clip left combines with half right on the other.  It is slightly different from the next, cutaway and image in the image.  Is this possible in imovie?  Help appreciated, thanks.

  Hi, Paulways,

  You will not be able to combine half a clip with half left right of the another clip using the cropping features of iMovie video.    However, you may be able to do it using Quicktime.  What you need to do is to crop each clip so that it plays in less than full screen.  In other words, a clip that you just want to the left to play and the other clip just on the right side.  Then you could combine clips in iMovie using side by side.

  Before proceeding to any culture, first you want to duplicate your clips and work with the duplicates if you keep your original recordings.   Once you've duplicated, try the following steps on each clip using Quicktime to crop on the right or left side as needed:

  

  Now you should have two clips, one that plays only the left side and one that plays only the right side.  You should be able to import it into iMovie and use the side by side feature combine them seamlessly.   At least, I think it works.

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• backup rman Exadata with zfs

  Our company has recently decided to start backup rman ZFS instead of regular tape backup.

  I would like to know what is the right measures to check if ITS configured right device of ZFS, the implementation of rman backups, etc.

  I'd appreciate someone here can point me to the right document.  I read ZFS Q and A and backup using ZFS best practices. All very unclear and seems none of them provide a digital step step.

  I wonder if Oracle provides an instruction step by step for the DBA.

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  Q documents & you examined include the "Oracle ZFS storage pool: FAQ: Exadata RMAN backup with Oracle ZFS Storage Appliance (Doc ID 1354980.1)" Note? This note has a lot of information and is updated regularly and includes information about configuring ZFS and RMAN backups to the device of ZFS.

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  Kasey

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  It seems that you do not have access to support, have you tried?

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