IBM SAN Volume Controller Thin Provisioning and Oracle ASMPosted: 07/03/2011
This paper discusses storage thin provisioning on the IBM® System Storage™ SAN Volume Controller (SVC) in an Oracle ASM environment. The mechanism that SVC employs to implement thin provisioning is the space efficient VDisk. Space efficient VDisks will henceforth be denoted as SE VDisks.
The paper includes the following:
- A general discussion of thin provisioning concepts.
- A discussion of the internal implementation of SE VDisks.
- Definitions for some terms which are specific to SE VDisk space utilization.
- The arguments to the “svctask mkvdisk …” command which are specific to the creation of SE VDisks. Several examples will be shown.
- The columns in the output from the “svcinfo lsvdisk …” command which are specific to SE VDisks.
- A description of the SE VDisk-specific command “svcinfo lssevdiskcopy …”.
- The monitoring and notification options available on the SVC.
- The space utilization behavior of SE VDisks when data is written starting at various offsets into the SE VDisks.
- The shrinking of the real_capacity of SE VDisks.
- The space utilization behavior of Oracle ASM on SE VDisks.
- The performance impact of using SE VDisks.
The back-end storage controller used with SVC for this paper is the IBM System Storage DS8700® and the benchmarking tools used are ORION, Swingbench, CPUMonitor and Tivoli Storage Productivity Center.
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