APC 15000 RAID Sata Interposer Features, Drive Enclosure Device Addressing, Grounding Checks

Drive Enclosure Installation

6.5 SAS DEM

The drive enclosure contains eight (8) top-loadable DEMs. The DEMs provide the SAS connectivity between the I/O module and the HDDs located within the enclosure. Each DEM connects to a single port of the HDD based on the location within the enclosure in which it is installed. Each of the eight DEMs installed in the enclosure has a unique I2C and SAS address based on a proprietary SAS address generation scheme.

6.6 SATA Interposer Features

The drive enclosure supports an active/active SATA MUX interposer which allows simultaneous access to the SATA HDD from both I/O modules installed in the enclosure. The MUX is implemented as a dongle module installed in the HDD carrier assembly. Additionally, the SATA interposer allows the power cycling of an individual HDD via SES commands.

6.7 Drive Enclosure Device Addressing

See Appendix B, “Drive Addressing”.

6.8 Grounding Checks

The product must only be connected to a power source that has a safety electrical earth connection.

Warning If more than one product is fitted in a rack, the earth connection to the rack is even more important, because the rack will then have a high “EARTH LEAKAGE CURRENT” (“TOUCH CURRENT”).

The earth connection to the rack must be checked before switching on, by an electrical engineer who is qualified to the appropriate local and National standards to perform the check.

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