Exadata Database Machine provides a solid storage redundancy infrastructure using ASM. Physical disks on multiple storage cell servers are logically partitioned, grouped and managed centrally by ASM. The way Exadata uses ASM has its own rules. The new term "Grid disk", ASM background processes, failgroups, redundancy options differ from non-Exadata systems. This storage configuration may sometimes seem to be complicated to Exadata Database Machine administrators. It's important to be able to answer the following questions, which are the topics of this presentation:
To what degree, disk and cell failures are tolerated;
How to understand if ASM is able to re-build redundancy after disk or cell failures;
What happens when multiple disks are failed at the same time and does it matter which disks failed;
What we need to pay attention to in terms of redundancy, when we do administrative task such as rolling restart of cell servers, resizing diskgroups, etc.