Troubleshooting

Improving Oracle OLTP database performance with Dell Fluid Cache for DAS
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Architecture: Fluid Cache based storage solution Figure 2.
When Fluid Cache is configured with the cache pool (SSDs) and the caching on the disks to be cached
(data ASM disks) are enabled, a new Fluid Cache disk is created for each of the data ASM disks.
Example: If /dev/sdc is the block device configured as an ASM disk, then a new Fluid Cache disk
named /dev/fldc0 gets created that maps to this ASM disk.
The Fluid Cache disk is a standard /dev/xxx device and is transparent to the Oracle database
application. The appropriate ownership and permission to the data ASM disks and to the new Fluid
Cache disks are set. As the metadata of the ASM disk group is kept on the ASM disk itself and not in the
Oracle dictionary, the ASM instance scans the ASM disks based on the parameter asm_diskstring and
reads the header information from the newly-discovered Fluid Cache disks. Thus ASM is able to mount
the DATA_DG ASM disk group like in the baseline configuration.
For details on configuring Fluid Cache, refer to the following sections in the appendix:
 Virtual Disk configuration for Fluid Cache based solution.
 Appendix C.1.1 Enabling Fluid Cache
 Appendix C.2.2. Udev settings for Fluid Cache based solution
 ASM disk group configuration for the Fluid Cache based solution