Hitachi HUS154530VLF400 User Manual

  

 Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification

96

Note: Common FC Services are used to communicate with the Fabric Name Server and are only issued by the drive when it is 
operating as a Public Loop Device.

The FC_CT field contains the FC_CT revision. The drive always sets this value to 0x01. 

IN_ID is a reserved field that may be used to carry the S_ID of the original requestor between different servers in the fabric. 
Its value in the FC_ACC/FC_FJT frame may be non zero if it was used. 

The FCS_Type indicates which FC Service is requested and the FCS_Subtype specifies which server will process the 
request. The drive does not check the FCS_Type/FCS_Subtype values returned by the Name Server in the FS_ACC/FS_RJT.

The Options field specifies various options used during FCS processing. The drive sends a value of 0x00, which specifies that 
this request must complete before another can be attempted. 

The Command/Response Code field identifies specific Fibre Channel Service Information Units (FS_IUs). The Command/
Response Code also determines the type of FS_IU. Command codes are as shown in Table 82. 

The drive supports only the Command code of 0217h, which specifies a RFT_ID request.

The Maximum/Residual Size field is used by the sender of an FS_REQ to indicate the maximum number of bytes it can 
accept in an FS_ACC payload. If the size of the responder’s FS_ACC payload is greater than this value, the responder will 

FC_CT 1 

IN_ID

3 

FCS_Type

1

FCS_Subtype

1

Options

1 

Reserved

1

Command/Response Code

2 

Maximum/Residual Size

2

Reserved

1

Reason Code

1

Reason Code Explanation

1

Vendor Unique

1

Non-(FS_IU)

Fibre Channel Service Requests (FS_REQ)

Fibre Channel Service Reject (FS_RJT)

Fibre Channel Service Accept (FS_ACC)

Reserved