Intel RS2WG160 Hardware User Guide - Page 25

SDRAM (Cache) The Intel® RAID Controller RS2WG160 includes 512 MB of integrated DDR2 800 MHz ECC SDRAM memory. This DIMM is connected directly to the memory controller interface bus of the ROC and serves as storage for the executable code transferred from the flash. It also serves as cache during RAID transactions. Cache mode selection takes immediate effect while the server is online and is available on a per virtual drive basis. The ROC memory controller provides single-bit ECC error correction with multi-bit detection support. The Intel® RAID Controller RS2WG160 supports Intel® RAID Smart Battery AXXRSBBU7 only. The optional Intel® RAID Smart Battery AXXRSBBU7 provides a battery backup option for data cached in the memory. It is connected remotely to the RAID controller through a supplied cable and remote extender board (REB). See Figure 5. Figure 5. Intel® RAID Smart Battery AXXRSBBU7 Note: Intel Corporation strongly recommends using an uninterruptible power supply (UPS). Diagnostic Components Audible Alarm The audible alarm beeps when a drive fails and also during a rebuild. The drive failure alarm beeps are: • Degraded array: Short tone, one second on, one second off. • Failed array: Long tone, three seconds on, one second off. • Hot spare commissioned: Short tone, one second on, three seconds off. Intel® RAID Controller RS2WG160 Hardware User's Guide 15