ASM Diskgroup with 1 disk? Is this possible?

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• ASM diskgroup with different disc size

  Hello
  
  DB: 10.2.0.4
  Operating system: AIX 5.3 64-bit L
  
  I have installation on 10g RAC ASM with node 2. It has the only Eve on ASM.
  
  Total DB size is 250 GB.
  Total size of FRA is 700 GB.
  
  My FRA diskgroup to archivelog (also holds multiplex controlfile) each size of 50 GB drive. Even if I set the retention period for 1 day, backup to disk, rman getting failed, due to space issues. So I manually delete obsolete data report and rerun backup.
  
  I want to add the workspace to FRA diskgroup regarding adding disks to FRA diskgroup. But, I have 100 GB drives available , it's not the same waist size of current existing FRA disc (50 GB).
  
  Here's my question
  
  (1) that I can Add the size different to the same diskgroup disc ?. If I add, are there performance problems?
  My all data files are out of FRA diskgroup and there are someother diskgroup.
  
  (2) if FRA diskgroup 50 GB and 100 GB of disks, and then how the archivelog and backup data will be erased?
  Will the data stored up to 50 GB in all disks in FRA, even * 100 GB * disc is?.
  
  (3) while doing recovery with different size of disk at diskgroup, what kind of problems can I face in performance wise?
  
  (4) can I remove any diskgroup 50 GB disks and add the 100 GB drive, so that I can increase the size of the disk in the same diskgroup?. I'll remove it and add at the same time.
  
  (5) add disks redundant external diskgroup , I'm ok with the following query?
  
  ALTER DISKGROUP FRA add DRIVE ' </dev/rhdsk1 >', </dev/rhdsk2 > ', </dev/rhdsk3 > ';
  
  
  Please help me on my doubts above.
  
  Thank you and best regards,
  Therese

  Hi Sunand,

  (1) can I add different diskgroup disc even size?. If I add, are there performance problems?
  My all data files are out of FRA diskgroup and there are someother diskgroup.

  A minimum of four (Oracle ASM disks) LUNS of equal size and performance is recommended for each disk group

  (2) if FRA diskgroup 50 GB and 100 GB of disks, and then how the archivelog and backup data will be erased?
  Data are saved up to 50 GB in all disks of FRA, same 100 GB drive is it?

  Oracle ASM data distribution policy is based on the ability. Ensure that the Oracle ASM disks in a disk group have the same ability to maintain balance.

  (3) while doing recovery with different size of disk at diskgroup, what kind of problems can I face in performance wise?

  Ensure that all Oracle ASM disks in a disk group have similar performance characteristics and the availability of storage. In configurations of storage with dimmers of mixed speed, for example, 10 K and 15 K rpm, i/o performance is limited by the slow speed control.

  (4) can I remove any diskgroup 50 GB disks and add the 100 GB drive, so that I can increase the size of the disk in the same diskgroup?. I'll remove it and add at the same time.

  Yes. First, you add the 100 GB drive and then remove the drives from 50 GB.

  (5) to add disks to external redundancy diskgroup, I'm ok with the following query?
  ALTER DISKGROUP FRA ADD DRIVE ",", ";

  Redundancy is controlled by the diskgroup. Then simply add the disks.

  e.g ALTER DISKGROUP FRA ADD DISK '/dev/rhdsk1', '/dev/rhdsk2', '/dev/rhdsk3';
  

  See doc below... Here are all your anwser.

  http://download.Oracle.com/docs/CD/B19306_01/server.102/b14231/storeman.htm#i1014729

  Kind regards
  Levi Pereira
  http://levipereira.WordPress.com

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  Hello team,

  Could not create the ASM diskgroup with the following error:

  SQL > create diskgroup redundancy data_asm1 external disk ' / dev/sdf *;

  create diskgroup redundancy data_asm1 external disk ' / dev/sdf. "

  *

  ERROR on line 1:

  ORA-15018: diskgroup cannot be created.

  ORA-15020: discovered in double disc ASM 'DATA_ASM1_0000 '.

  ASM Diskstring

  SQL > show parameter asm_diskstring

  VALUE OF TYPE NAME

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

  asm_diskstring string/dev/oracleasm/disks/DISK *, /dev / sd *

  Please let me know how to solve this problem

  Kind regards

  Hello

  check your disc diskgroup status grid +. display result

  1 res ora of $ crsctl State. GRID.dg or $ crsctl status res ora.grid.dg

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  ASMCMD > lsdg

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  Hi guys,.
  
  In RAC 11 GR 2, how to identify which ASM Diskgroup is attached to which disks... (OS is RHEL 5.4).
  
  We could list ASM starts by,
  *#oracleasm listdisks * but this command does not display the disks assigned to ASM DiskGroup.
  
  Even for check location of OCR and voting disks only show Diskgroup name and not the actual discs.
  $ocrcheck
  $crsctl query css votedisk
  
  
  (as in gr 10, 2 RAC, we entered /etc/rules.d/udev/60-raw-rules raw file mapping of the OCR, voting disk and other ASM Diskgroup)
  
  
  Please help me, as long as the customer place, I could see LUN as assigned to the server and get is not an exact idea whose records have been used for OCR and voting disk DATA Diskgroup.
  
  
  Thank you
  Manish

  And for this, you can use oracleasm querydisk. Using that you can identify which device marked for asm or not. for example you can see below the example.

  [oracle@localhost init.d]$ sqlplus "/as sysdba"
  
  SQL*Plus: Release 10.2.0.4.0 - Production on Thu Jun 3 11:52:12 2010
  
  Copyright (c) 1982, 2007, Oracle.  All Rights Reserved.
  
  Connected to:
  Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
  With the Partitioning, OLAP, Data Mining and Real Application Testing options
  
  SQL> select path from v$asm_disk;
  
  PATH
  --------------------------------------------------------------------------------
  /dev/oracleasm/disks/VOL2
  /dev/oracleasm/disks/VOL1
  
  SQL> exit;
  
  [oracle@localhost init.d]$ su
  Password:
  [root@localhost init.d]# /sbin/fdisk -l
  
  Disk /dev/sda: 80.0 GB, 80000000000 bytes
  255 heads, 63 sectors/track, 9726 cylinders
  Units = cylinders of 16065 * 512 = 8225280 bytes
  
     Device Boot      Start         End      Blocks   Id  System
  /dev/sda1   *           1        1305    10482381   83  Linux
  /dev/sda2            1306        9401    65031120   83  Linux
  /dev/sda3            9402        9662     2096482+  82  Linux swap / Solaris
  /dev/sda4            9663        9726      514080    5  Extended
  /dev/sda5            9663        9726      514048+  83  Linux
  
  Disk /dev/sdb: 80.0 GB, 80026361856 bytes
  255 heads, 63 sectors/track, 9729 cylinders
  Units = cylinders of 16065 * 512 = 8225280 bytes
  
     Device Boot      Start         End      Blocks   Id  System
  /dev/sdb1               1        4859    39029886   83  Linux
  /dev/sdb2            4860        9729    39118275   83  Linux
  [root@localhost init.d]# ./oracleasm querydisk /dev/sdb1
  Device "/dev/sdb1" is marked an ASM disk with the label "VOL1"
  [root@localhost init.d]# ./oracleasm querydisk /dev/sdb2
  Device "/dev/sdb2" is marked an ASM disk with the label "VOL2"
  [root@localhost init.d]# ./oracleasm querydisk /dev/sda1
  Device "/dev/sda1" is not marked as an ASM disk
  [root@localhost init.d]#
  

  Also in windows:

  C:\Documents and Settings\comp>asmtool -list
  NTFS                             \Device\Harddisk0\Partition1           140655M
  ORCLDISKDATA1                    \Device\Harddisk0\Partition2             4102M
  ORCLDISKDATA2                    \Device\Harddisk0\Partition3             4102M
  NTFS                             \Device\Harddisk0\Partition4           152617M
  
  C:\Documents and Settings\comp>
  

  answered by Alex.
  Reference:-How to identify what disc rawdevice is named as VOL1 in ASM OS level

  Happy new year.
  Kind regards

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  Hello
  
  We can add disks to the existing diskgroup ASM of the production in line (no stop)?
  
  AIX 5.3
  ORACLE 10.2.0.4
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  Its a matter of production...
  
  -Thanks in advance.
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  Kind regards.

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  Published by: user11150436 on November 11, 2010 15:00

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