HP Tc2120 HP 2100S SCSI RAID - User Guide (337208-001) - Page 20
Cache Status LEDs, Table 2-3, LED Display During Controller Active - ram
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About Your New Controller Table 2-3: LED Display During Controller Active continued LED Function 3 Indicates the controller's internal operating system is in its idle loop. 4 Indicates that the controller's internal operating system is processing an interrupt. 5 Reserved for future use. 6 Indicates that the cache controller is using DMA to perform a data transfer. 7 Indicates the controller is generating parity information for a RAID 5 array (hardware XOR). 8 Indicates that there is a command on the SCSI bus. IRQ Lit only when the controller activates an interrupt on the host PCI bus. Cache Status LEDs Two LEDs on the Adaptec SCSI RAID controller indicate the status of the onboard cache RAM. For the location of the LEDs on your controller, refer to "Board Layout" in this chapter. • The green ECC Enabled LED is lit when the installed DIMMs are ECC memory modules. This indicates that the controller data cache is ECC protected. • The red ECC Error LED is lit when a correctable or non-correctable error has been detected in one of the ECC DIMMs. After the error has been corrected, the LED will be on until the controller is powered down. Cache failure information is recorded in the controller error log. 2-8 HP 2100S SCSI RAID Controller User Guide