Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
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17.3 Extended Link Services
For Extended Link Service frames, the Header TYPE field is set to 01h (Extended Link Service). R_CTL is either 22h
(Extended Link Data, Unsolicited Control) for a Request, or 23h (Extended Link Data, Solicited Control) for a Reply.
The first byte of the payload is the LS_Command and encodes the Request or Reply, as shown in Table 33 and Table 34.
Table 33: Extended Link Service replies
Table 34 is a comprehensive list of all Extended Link Service commands supported by the drive.
Table 34: Extended Link Service requests
The code '11h' for the TEST ELS (not supported by the drive) is also used by the LIPxx frames that circulate during Loop Ini-
tialization. To differentiate these from a TEST ELS, the second byte of the payload must be examined and compared with
Table 35.
Note: PLDA 1.10 specifies: “Reserved FC-PH fields are not required to be checked for zeroes. Validity bits set to 0 remove
any requirement to check the corresponding field for zeroes (e.g., if F_CTL bit 3=0, receiving N_Ports are not required to ver-
ify that the parameter field in word 5 of the frame header contains zeroes).” As such, the drive does not validate 1) reserved FC
fields or 2) fields that are not reserved but are not valid for the current frame (as shown in the example above with F_CTL bit
3). This does not apply to any reserved field checking and testing within the FCP_CDB. These fields are checked as per ANSI
Code Reply Abbr.
02h Accept LS_ACC
01h Link Service Reject LS_RJT
Code Request Abbr.
52h Address Discovery ADISC
60h Fabric Address Notification FAN
04h Fabric Login FLOGI
05h Logout LOGO
50h Port Discovery PDISC
03h Port Login PLOGI
20h Process Login PRLI
21h Process Logout PRLO
0Fh Read Link Status RLS
53h Report Node Capabilities RNC
78h Report Node ID RNID
12h Re-instate Recovery Qualifier RRQ
24h Third Party Process Logout TPRLO
7Dh Report Port Speed Capabilities RPSC
Note: Only lists ELSs supported by the drive. Refer to FC-PH for a complete list of ELSs.
