Product manual

Cheetah 4LP FC Product Manual, Rev. A 37
[2] Warning. Power loss during flash programming can result in firmware corruption. This usually makes the
drive inoperable.
[3] The 6-byte Reserve and Release commands are not supported because they do not support the third-
party address space required for Fibre Channel.
[4] Reference Mode Sense command 1Ah for mode pages supported.
9.3.1 Inquiry data
Table 11 lists the Inquiry command data that the drive should return to the initiator per the format given in the
Fibre Channel Interface Manual .
Table 11: Cheetah 4LP FC inquiry data
* Copyright year (changes with actual year).
** 02 = SCSI-2 implemented with some SCSI-3 features (default).
PP 20 = Inquiry data for an Inquiry command received on Port A.
30 = Inquiry data for an Inquiry command received on Port B.
R# Four ASCII digits representing the last four digits of the product firmware release number.
S# Eight ASCII digits representing the eight digits of the product serial number.
D# Reserved 00 00 00 00.
[ ] Bytes 16 through 24 reflect drive model.
9.3.2 Mode Sense data
The Mode Sense command provides a way for the drive to report its operating parameters to the initiator. The
drive maintains four sets of mode parameters:
1. Default values
Default values are hard-coded in the drive firmware stored in flash E-PROM (nonvolatile memory) on the
drive’s PCB. These default values can be changed only by downloading a complete set of new firmware
into the flash E-PROM. An initiator can request and receive from the drive a list of default values and use
those in a Mode Select command to set up new current and saved values, where the values are change-
able.
2. Saved values
Saved values are stored on the drive’s media using a Mode Select command. Only parameter values that
are allowed to be changed can be changed by this method. Parameters in the saved values list that are not
changeable by the Mode Select command get their values from default values storage.
When power is applied to the drive, it takes saved values from the media and stores them as current val-
ues in volatile memory. It is not possible to change the current values (or the saved values) with a Mode
Select command before the drive achieves operating speed and is “ready.” An attempt to do so results in a
“Check Condition” status.
On drives requiring unique saved values, the required unique saved values are stored into the saved val-
ues storage location on the media prior to shipping the drive. Some drives may have unique firmware with
unique default values also.
Bytes Data (hex)
0-15 00 00 ** 22 8B 00 PP 0A 53 45 41 47 41 54 45 20 Vendor ID
16-31 53 54 [33 34 33 34 35 30 31 46 43] 20 20 20 20 20 Product ID
32-47 R# R# R# R# S# S# S# S# S# S# S# S# 00 00 00 00
48-63 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
64-79 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
80-95 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
96-111 00 43 6F 70 79 72 69 67 68 74 20 28 63 29 20 31* *Copyright
112-127 39* 39* 37* 20 53 65 61 67 61 74 65 20 41 6C 6C 20 notice
128-143 72 69 67 68 74 73 20 72 65 73 65 72 76 65 64 20
144-147 D# D# D# D#