Can redundancy of the OCR - we have OCR mirror with Redo logs in the diskgroup REDO01?

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  bastyav,
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• How OCR mirroring works

  Hi gurus,

  According to the Oracle docs "disk groups normal redundancy provide 3 disk files with right to vote, 1 OCR and 2 copies (a primary and a secondary mirror).»

  Does this mean there are 2 OCR in the diskgroup?. Then,

  Where the OCR Elementary and mirror created in this case? Are they were distinct failure group? So how can I check the same through asmcmd?

  This is my environment set in place

  [grid@xxxx01 ~] $ ocrcheck

  Status of the Oracle Cluster registry is:

  Version: 3

  Total space (in kilobytes): 262120

  Used space (in kilobytes): 2800

  Amount of available space (KB): 259320

  ID: 1074808153

  Device file name / : + OCR_VOTE

  Verifying the integrity of file/device succeeded

  File/device not configured

  File/device not configured

  File/device not configured

  File/device not configured

  Checking cluster registry integrity succeeded

  Logical corruption control bypassed due to the non-privilegie user

  My + OCR_VOTE is in normal redundancy, while watching the level to ASM

  [grid@xxxx01 ~] $ asmcmd

  ASMCMD >

  ASMCMD > cd + OCR_VOTE

  ASMCMD > ls

  ehrptpi-cluster.

  ASMCMD > cd xxxxxi-cluster.

  ASMCMD > ls

  ASMPARAMETERFILE /.

  OCRFILE /.

  ASMCMD > cd OCRFILE /

  ASMCMD > ls-l

  Name of type Redund time scratched Sys

  OCRFILE MIRROR RUDE JAN 07 20:00 Y REGISTRY.255.763526561

  ASMCMD >

  Here I can see OCR only one file. So what is meant by 1 OCR and 2 copies?

  Can someone shed some light on how OCR mirrored actually works?
  

  Thank you and best regards,

  Mahi

  Hi Manon,.

  you have different KFFXP because there are two different files. 253 is you spfile asm and 255 is your ocrfile. Asmcmd pass in your diskgroup to ocr_vote to see the two files. It should look like this:

  ASMCMD [+ SYSTEMDG/rac-entw] > ls

  ASMPARAMETERFILE /.

  OCRFILE /.

  ASMCMD [+ SYSTEMDG/rac-entw] > ls ASMPARAMETERFILE.

  REGISTRY.253.804243265

  ASMCMD [+ SYSTEMDG/rac-entw] > ls OCRFILE.

  REGISTRY.255.804243269

  ASMCMD [+ SYSTEMDG/rac-entw] >

  The recommendation for an another OCR second or even third is more fault tolerant. With an OCR (mirrored with two copies), you can lose a copy but not all diskgroup. If you have more on other OCR starts you might survive even the loss of a diskgroup together.

  However, since your votefiles are stored on the disks in the Group ocr_vote on your cluster would break even if you lose this group. However, you have an up-to-date version of your ocr, compared to a version of several hours of your backup of the ocr.

  Beside that, I see personally very little benefit in addition to a mirror OCR.

  What do you mean with master OCR?

  Concerning

  Thomas

• RAC + ASM: Grid OCR and VotingDisk - installer puts on simple Diskgroup

  Hi all
  
  It seems that the grid Setup does me not to choose/create more than 1 (one) Diskgroup OCR and voting disk. Am I missing something, or is it best practice?
  
  I thought it would have been good to multiplex OCR/vote at least 2 different ASM starts...
  
  I'm also confused because the oracle documentation says that, for most installations, starts at only 2 would be enough ("Data + index + LOBs" and "FRA").
  
  In a matter of fact, what I was planning to do is have 3 starts in this configuration (data, index + LOBs, FRA) and have OCR and vote multiplexes on TWO 'data' and 'Index + LOB '. But now I don't know if the sharing of data and indexes have a meaning, ASM...
  
  (1) that it makes sense (the fact I want to multiplex OCR + vote)?
  (2) how to achieve the result desired during the installation, if possible (multiplexing OCR + vote)?
  (3) to other recommendations (for example using a 4th Diskgroup, or should I use only 2 of them)?
  (4) with ASM, is it still wise to separate the data and the indexes on different starts?
  
  Thanks for your help

  Hello

  rlomba wrote:
  Hi all

  It seems that the grid Setup does me not to choose/create more than 1 (one) Diskgroup OCR and voting disk. Am I missing something, or is it best practice?

  My recommendation: this first diskgroup you can use to store your files with the right to vote and the OCR, and later, you can create another small diskgroup add OCR and move ASMSPFILE to this new diskgroup.

  Vote files can be stored in a single diskgroup.

  I thought it would have been good to multiplex OCR/vote at least 2 different ASM starts...

  I'm also confused because the oracle documentation says that, for most installations, starts at only 2 would be enough ("Data + index + LOBs" and "FRA").

  In a matter of fact, what I was planning to do is have 3 starts in this configuration (data, index + LOBs, FRA) and have OCR and vote multiplexes on TWO 'data' and 'Index + LOB '. But now I don't know if the sharing of data and indexes have a meaning, ASM...

  (1) that it makes sense (the fact I want to multiplex OCR + vote)?

  I really do not recommend putting database files and clusterware together. This may disturb the management of the environment and could dowtime. (for example, you can never stop the diskgroup)
  for example: files with right to vote are not stored in the diskgroup (+ data), they are placed directly into asmdisk, then in case of maintenance in the diskgroup, for example to increase the size of the lun, you can just delete the asmdisk, you must move the files with right to vote in another place and realize the diskgroup maintenance.

  Dowtime? Yes... You can move only the voice and the ocr without interruption of service, but to move ASMSPIFILE, you need downtime. This is necessary for ASM using new SPFILE and release the old Diskgroup. * ORA-15027: active use of the diskgroup opposes its release (with no connected customer database) [ID 1082876.1*]

  (2) how to achieve the result desired during the installation, if possible (multiplexing OCR + vote)?

  You can't get the result desired during installation, but you can reconfigure at the end of the installation.

  Read:
  {message: id = 10028550}
  I recommend you read the entire thread above

  (3) to other recommendations (for example using a 4th Diskgroup, or should I use only 2 of them)?

  My recommendation, OCR and ASM SPFILE (diskgroup1), MIRROR of the OCR and VOTING QUEUES (DISKGROUP 2), FILES of DATABASE (DISKGROUP3), ONLINELOG (4 Diskgroup in an array with RAID 10) and FRA (DISKGROUP 5)

  Read:
  {message: id = 9676881}

  (4) with ASM, is it still wise to separate the data and the indexes on different starts?

  If you use different tables in the storage of data and indexes, perhaps, but I recommend doing this only if you have performance issues and you did the test and know there will be benefits if you don't have a reason why I do not recommend this because it increases the administration of storage, ASM and data base.

  Read about the use of different tablespace for data and indexes.
  {: identifier of the thread = 2189138}

  More 1 diskgroup using database files must be careful, because the Oracle restore can only use a single diskgroup.
  http://levipereira.WordPress.com/2011/10/25/tip-hint-db_create_file_dest-behavior-when-using-ASM/

  Kind regards
  Levi Pereira

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