OTN Appreciation Day: Automatic Storage Management (ASM)
Big shout out to Tim for kicking this off!
Automatic Storage Management (ASM) provides optimised volume management and filesystem capabilities for Oracle databases, whether they be single or multi instance (RAC) implementations.
Although introduced with Oracle 10g Release 1 in 2004, I first used it in a production scenario around 2008, when upgrading a hardware platform for a Data Warehouse. It seemed like a logical choice for myself and the DBAs at the time, although the storage team were less pleased at losing some control. Ultimately it proved a big success on that project and is still in stable, reliable use today.
Things I like about ASM include:
- Simplifies storage management
- Automatic rebalancing when capacity is added
- Visibility within Enterprise Manager for monitoring
- Availability of detailed metrics within the database
- Reliable, balanced and consistent performance
- Works with RAC
- Rolling upgrades and patching
- Provides a reliable cluster filesystem (ACFS)
- Even more cool features coming in 12c such as Flex ASM
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Some useful links:
ASM Administrators Guide 12cR1 (Oracle Docs)
The Mother Of All ASM Scripts (John Hallas)
Technical overview of new features for ASM in 12c (Whitepaper)