How do I view ASM disks?

Posted on by Mary Andersen

How do I view ASM disks?

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 my ASM Diskgroup usage?

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.

How do I get ASM metadata?

ASM metadata is stored in disk groups – in other words if there are no disk groups there is no ASM metadata….The physical ASM metadata are the following structures:

  1. Disk header.
  2. Free Space Table (FST)
  3. Allocation Table (AT)
  4. Partnership and Status Table (PST)

What is 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. When an ASM instance starts, it automatically discovers all available ASM disks.

How do I check ASM Diskgroup free space in GB?

Answers. // The Following query can be used to find out the total/free space in ASM Diskgroups: SQL:ASM>select name,total_mb,free_mb,state from v$asm_diskgroup; ASMCMD tool can also be used to find the free space.

How do I reclaim space from ASM Diskgroup?

ASMFD Thin_Provisioned Demo

  1. Create an ASM Disk Group using the ASM Filter Driver.
  2. Create a tablespace in this diskgroup and populate it with some random data.
  3. Check the space allocated at the database and array level.
  4. Drop the tablespace and run ASM rebalance.
  5. Check the space again.

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 free space on ASM Diskgroup?

How do I check ASM Diskgroup attributes?

You can display disk group attributes with the V$ASM_ATTRIBUTE view and the ASMCMD lsattr command. Disk group attributes can be set with the ATTRIBUTE clause of the ALTER DISKGROUP or CREATE DISKGROUP SQL statement and the ASMCMD setattr and mkdg commands.

What files can be stored in the ASM Diskgroup?

You can store the following file types in ASM diskgroups:

  • Datafiles.
  • Control files.
  • Online redo logs.
  • Archive logs.
  • Flashback logs.
  • SPFILEs.
  • RMAN backups.
  • Temporary datafiles.

How do I extend ASM Diskgroup?

Grow disk group through ASM: This command is run from the database node as sysasm: alter diskgroup DATA_DB03P resize all rebalance power 32; select * from gv$asm_operation; Once this completes, you are done!

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.

How to view disk group attributes with V $ASM views?

A disk group number is not recorded in any persistent structure, but the current value can be viewed in the GROUP_NUMBER column of the V$ASM views. Example 6-1 Viewing disk group attributes with V$ASM_ATTRIBUTE An example of the use of the V$ASM_ATTRIBUTE and V$ASM_DISKGROUP views is shown in this example.

What is the minimum ASM value required for disk groups to display?

The COMPATIBLE.ASM value must be set to 11.1 or higher for the disk group to display in the V$ASM_ATTRIBUTE view output. Attributes that are designated as read-only ( Y) can only be set during disk group creation.

Where can I find the current disk group number in ASM?

This number may change across disk group mounts. A disk group number is not recorded in any persistent structure, but the current value can be viewed in the GROUP_NUMBER column of the V$ASM views. An example of the use of the V$ASM_ATTRIBUTE and V$ASM_DISKGROUP views is shown in Example 6-1.

How do I view all disks in ASM_disk?

It only returns information about any disks that are part of mounted disk groups in the storage system. To see all disks, use V$ASM_DISK instead. Describes a disk group (number, name, size related info, state, and redundancy type). This view performs disk discovery every time it is queried.