Ultrastar C10K600 OEM Specification

SAS Time

Link Reset sequence

Phy Reset sequence

OOB sequence Speed Negotiation sequence

Identification sequence

SAS w/Hard Reset

Phy Reset sequence

Time

Link Reset Sequence with hard Reset

Hard Reset Sequence

Phy Reset sequence Identification sequence

17.5.2 Hard Reset

A Hard Reset sequence on a port will not affect the other port, but the outstanding commands on the other port will be aborted due to the LUN reset associated with the Hard Reset. The effect of a Hard Reset will be similar to a Power on Reset, and will result in the re-initialization of all Drive resources. The first command issued from every initiator on the port that received the

Hard Reset will result in a CHECK CONDITION with a sense key of UNIT ATTENTION and an additional sense code of

SCSI BUS RESET OCCURRED. The first command issued from every initiator on the other port will result in a CHECK

CONDITION and an additional sense code of BUS DEVICE RESET OCCURRED.

A Hard Reset Sequence will never be issued by the Drive. A link reset will be initiated by the drive on the affected port upon completion of Hard Reset processing.

17.5.3 SAS OOB (Out of Band)

Out of band (OOB) signals are low-speed signal patterns detected by the Phy that do not appear in normal data streams. They consist of defined amounts of idle time followed by defined amounts of burst time. During the idle time, D.C. idle is transmitted. During the burst time, ALIGN (0) primitives are transmitted repeatedly. The signals are differentiated by the length of idle time between the burst times.

As a SAS compliant device, the Drive uses three OOB signals: COMINIT/COMRESET and COMWAKE and COM-

SAS.OOB operations are beyond the scope of this specification. Please refer to the ANSI SAS 2 specification for more details.

The drive will initiate OOB by sending COMINITs, under the following conditions:

• POR

• loss of sync

• Identify timeout

HGST Ultrastar C10K600 (SAS) Hard Disk Drive Specification

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