What is Asmlib?

What is Asmlib?

ASMLib is an optional support library for the Automatic Storage Management feature of the Oracle Database. Automatic Storage Management (ASM) simplifies database administration and greatly reduces kernel resource usage (e.g. the number of open file descriptors).

How do I find my Asmlib version?

Run the ” uname -r ” command on your computer to determine your kernel version. The corresponding package has the name oracleasm- . Distributions based on Linux 2.4 kernels still use the 1.0. X driver software, release 1.0.

What is KMOD Oracleasm?

The kmod-oracleasm module is the kernel driver required for the RHCK kernel and depends on the kernel version.

Where is Oracleasm located?

Answer: The Oracle ASMLib configuration file is located at /etc/sysconfig/oracleasm, and this file contains all the startup configuration that the system administrator originally specified via the /etc/init. d/oracleasm configure command.

What are the advantages of ASM?

ASM provides the following benefits: Striping—ASM spreads data evenly across all disks in a disk group to optimize performance and utilization. This even distribution of database files eliminates the need for regular monitoring and I/O performance tuning.

Is ASM a database?

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.

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 do I check my ASM instance status?

Verify the ASM setup

  1. Change to the Oracle Clusterware/Grid Infrastructure home directory: For Oracle RAC 10g Release 2/Oracle RAC 11g Release 1: # cd $CRS_HOME/bin.
  2. Verify the status of ASM on all the nodes in the cluster: # ./srvctl status asm ASM instance +ASM1 is running on node galaxy.

How do I uninstall Asmlib?

If Oracle ASM library driver (Oracle ASMLIB) is installed but you do not use it for device path persistence, then deinstall Oracle ASMLIB:

  1. Stop Oracle ASM and any running database instance:
  2. Log in as root .
  3. Stop the Oracle Restart stack:
  4. Stop Oracle ASMLIB:
  5. Remove the oracleasm library and tools RPMs:

How do I create a disk 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 uninstall Oracleasm?

Deinstalling Oracle ASMLIB On Oracle Database

  1. Stop Oracle ASM and any running database instance:
  2. Log in as root .
  3. Stop the Oracle Restart stack:
  4. Stop Oracle ASMLIB:
  5. Remove the oracleasm library and tools RPMs:
  6. Check if any oracleasm RPMs are remaining:
  7. If any oracleasm configuration files are remaining, remove them:

Should I use ASM?

In sum, only use ASM when you have a large complex database that spans many disk spindles and RAID striping is used.

How do I configure asmlib in Oracle?

When using ASMLib, the candidate disks are listed using the stamp associated with them, while the raw devices are listed using their device name. To configure an ASM instance, start the Database Configuration Assistant by issuing the “dbca” command as the oracle user.

How to use ASM using asmlib and raw devices?

ASM using ASMLib and Raw Devices 1 Introduction. 2 Partition the Disks. 3 ASMLib Installation. 4 Raw Device Setup. 5 ASM Creation. 6 Database Creation. 7 Switching from Raw Devices to ASMLib. 8 Switching from ASMLib to Raw Devices. 9 Performance Comparison.

What packages do I need to install for asmlib?

Depending on your operating system, you must install the oracleasmlib and oracleasm-support packages for all Oracle ASMLIB installations.

Why does asmlib choose the multipath disk?

This allows ASMLib to choose the multipath disk and make it available to Oracle. ASMLib allows two modifications to the disk scan order. First, it allows exclusion of certain disks.