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Installation
5-4 C141-E237
5.4 Checking Operation after Installation and Preparing the HDDs for Use
5.4.1 Checking initial operation
The procedure for verifying operation after power-on is explained below.
(1) Initial diagnosis at the time of power-on:
a) When the HDDs are turned on, the Active LED blinks and the HDDs perform the initial self-
diagnosis (controller hardware diagnosis).
b) When the SAS protocol controller diagnosis is completed normally, the HDDs start the LINK
RESET sequence defined by the SAS protocol to establish synchronization with the connected
SAS devices (e.g., the host system).
c) When the initial diagnosis is completed normally, the HDDs can respond to commands from the
host.
(2) Verifying interface connection:
When verification of initial operation after power-on is completed normally, the host system checks
whether the HDD connection to the interface is normal. The procedure for this check depends on the
host system configuration. The following is a general check procedure:
a) Confirm that the transfer rate and HDD SAS addresses can be recognized during the LINK
RESET sequence.
b) Issue the INQUIRY, WRITE BUFFER, and READ BUFFER commands to verify that data is
received and transmitted normally in the interface.
(3) Verifying disk drive operation :
When the LINK RESET sequence has completed, the host system can issue a spindle motor start
instruction and check whether the disk drive is ready to operate.
a) The host system instructs the spindle motor to start by sending the NOTIFY (ENABLE SPINUP)
primitive to the disk drive.
b) The HDDs do not start the motor until the NOTIFY (ENABLE SPINUP) primitive is issued.
c) The disk drive enters the READY state within about 60 seconds after the NOTIFY (ENABLE
SPINUP) primitive is issued.
d) The HDD Active LED blinks (flashes on and off every 0.5 seconds) while the motor is running.
e) The Active LED remains lit when the HDDs enter the READY state. The host system can use
the TEST UNIT READY command to confirm that the HDDs are in the READY state.
(4) Responses to operation errors :
a) Confirm again that connectors are securely attached to cables.
b) Check whether the supply voltage is supplied normally. (Measure the voltage at the power
connectors of the HDDs.)