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How do I know the size of my ASM Diskgroup?

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How do I know the size of my ASM Diskgroup?

ASM Disk group size Check

  1. select name, total_mb, free_mb, usable_file_mb,
  2. round(((total_mb-nvl(free_mb,0))/total_mb)*100,0) percent_used.
  3. from V$ASM_DISKGROUP_STAT;
  4. SELECT G.NAME,
  5. sum(b. total_mb) total_mb,
  6. sum((b. total_mb – b. free_mb)) used_mb,
  7. sum(B. FREE_MB) free_mb,
  8. decode(sum(b. total_mb),0,0,(ROUND((1- (sum(b.

What is a Diskgroup?

A disk group consists of a grouping of disks that are managed together as a unit. These disks are referred to as ASM disks. An ASM disk can be a disk device, a partition, or a network-attached file.

How do I create a Diskgroup in ASM?

  1. Create ASM disk. Get the Lun name from storage team. Lun Name – /dev/sda1.
  2. Check the ASM Disks, Check the newly added disk, $sudo oracleasm listdisks.
  3. Create the ASM Diskgroup. $sqlplus / as sysasm.
  4. Check the newly added disk in ASM Diskgroup.

How do I check ASM disk?

select group_number, name, state, type from v$asm_diskgroup;

  1. To check the asm instance is connected and running:
  2. To check the asm disks and their status:
  3. MISSING – Automatic Storage Management metadata indicates that the disk is known to be part of the Automatic Storage Management disk group, but no disk in the storage.

How do I check disk ASM in Linux?

In Linux, ASMLib provides the wrapper for managing the ASM disks. To identify the underlying physical device that the ASM disk point to, you can use the oracleasm querydisk command. The querydisk option will list the major and minor numbers that can be used to match the physical device.

How do I add a disk to ASM Diskgroup?

  1. Create ASM disk. Get the Lun name from storage team. Lun Name – /dev/sda1.
  2. Check the ASM Disks, Check the newly added disk, $sudo oracleasm listdisks.
  3. Create the ASM Diskgroup. $sqlplus / as sysasm.
  4. Check the rebalance status. $sqlplus / as sysasm.
  5. Check the newly added disk in ASM Diskgroup.

What is ASM Diskgroup?

A disk group consists of multiple disks and is the fundamental object that Oracle ASM manages. Each disk group contains the metadata that is required for the management of space in the disk group. Disk group components include disks, files, and allocation units. Files are allocated from disk groups.

What is ASM volume?

ASM volumes are created within an ASM disk group and are used in conjunction with the volume driver for general purpose or ASM cluster file systems. A volume can take up all or part of a single disk group, but it can exist in only one disk group. However, a disk group can contain many volumes, space permitting.

How do I create ASM Diskgroup with external redundancy?

Create a new datastore out of the first volume. Provision a VMFS disk out of the datastore and attach to the VM as a new disk. Using ASMlib perform a createdisk to update the header of the disk as ASM disk. Create ASM diskgroup with external redundancy on this disk.

How do I create Asmca Diskgroup?

Create ASM diskgroup using ASMCA

  1. Click on create to create new disk group.
  2. Enter the disk group name to be created. select the redundancy. & last select the disks to be added to diskgroup. & click OK.
  3. REDO disk group is created. In ASMCA it will show REDO diskgroup with 50 GB disk space. Share this: Twitter.

How do I mount a Diskgroup?

When you want to mount or dismount disk groups manually, use the ALTER DISKGROUP… MOUNT or ALTER DISKGROUP… DISMOUNT statement. You can mount or dismount disk groups by name, or specify ALL .

What is ASM disk Linux?

Automatic Storage Management (ASM) is an integrated, high-performance database file system and disk manager. ASM is based on the principle that the database should manage storage instead of requiring an administrator to do it.

What are the asmcmd disk group management commands?

Table 10-68 lists the ASMCMD disk group management commands with brief descriptions. Changes a disk group (add, drop, rebalance, or migrate on the Exadata appliance). Checks or repairs a disk group. Drops a disk group. Displays I/O statistics for disks. Lists the attributes of a disk group. Lists disk groups and their information.

What causes asmcmd to wait for the disk group to rebalance?

Causes ASMCMD to wait for the disk group to be rebalanced before returning control to the user. The default is not waiting. When a failure group is specified, this implies all the disks that belong to it should be onlined. The following are examples of the online command.

What is a disk group name?

Disk group name. Failure group name. Specifies a single disk name. Specifies the time before the specified disk is dropped as nm or nh, where m specifies minutes and h specifies hours. For example, 120m or 2h .The default unit is hours. When a failure group is specified, this implies all the disks that belong to it should be offlined.

What are the failure groups in Disk Management?

The failure groups are optional parameters. The default causes every disk to belong to a its own failure group. Dropping disks from a disk group can be performed through this operation. An individual disk can be referenced by its Oracle ASM disk name. A set of disks that belong to a failure group can be specified by the failure group name.