Auto Configuration

> Auto Configuration

> NOTE The Auto or Default configuration method, RAID 1, is created with a Write Back write policy option only by using the Nytro Flash module. The Auto configuration is created on system initialization by firmware by using the Nytro Flash modules that are present on the Nytro controller.

> Any modification made by you is treated as a change in the configuration, and the configuration is changed from Auto configuration in to Manual configuration. If you modify the Auto configuration, the new Manual configuration data is stored in NVRAM, and you cannot revert to the Auto configuration method. To revert to Auto configuration, you must select the factory default settings at the controller level. When the Auto configuration is modified, firmware generates an event to notify the administrating application.

> You can apply the factory default settings by using the WebBIOS utility, HII utility, or StorCLI utility (not by using the MegaRAID Storage Manager software).

> | Based on the type of the RAID level and over provisioning (28 percent), the size of the usable Nytro Cache drive varies.

> | The controller supports only RAID 0 and RAID 1 levels for the Nytro Cache drive based on the Nytro MegaRAID Firmware Configuration parameters. The controller supports RAID 0 Write Through and Write Back. If for some reason, Auto configuration fails, the configuration method is switched to Manual configuration.

> | You cannot create a cache drive from a combination of Nytro Flash modules and external SSD drives, however if there are external SSD connected, they are treated as normal SATA physical drives (PDs).

> | The HDD operations, such as hotspare commission, rebuild, consistency check, initialization, and copyback are not supported on the Nytro Cache drive. Only one Nytro Cache drive can be created by using the Nytro Flash modules by using either RAID 0 or RAID 1 level.

> | By default, auto configuration creates one RAID 1 Nytro Cache drive group; you cannot change it unless you delete and create a Nytro Cache drive group manually.

> These are the typical operations performed:

> | Creating the configuration.

> | Clearing the configuration.

> | Creating Nytro Cache drive group.

DB15-000988-08-December 2013
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