HP C2488A Technical Reference Manual page 122

Access Log
The ACCESS LOG command allows the Initiator to read the entries contained in the disk
drive's maintenance log. This information is available for maintenance purposes. The log
information is maintained in a RAM table which is initialized from the disk log on power-on,
reset, or Format Unit. It is only posted to the disk when an error entry is added. The
ACCESS LOG command will alwa.ys return this information from the RAM log; there is no
disk access. ,-
Access Log Command Descriptor Block (COB)
Bit
Byte
7
1
6
J
5
l
4
I
3
I
2
J
1
1
0
00
Opcode = F2H
01 Logical Unit Number
I
Reserved
I
Clear
I
PHYS
02-06
(MSB=02) Reserved (LSB=06)
07-08
(MSB=07) Allocation Length (LSB=08)
09
Control Byte
Clear. A CLEAR bit of one (1) allows the Initiator to clear all the current log entries after
reading them.
PHYS (Physical Address). A PHYS bit of zero (0) causes all addresses and block counts to
be in terms of logical blocks. Any addresses that are outside the user data space are set to
addresses higher than the maximum block address when logical block references are requested.
If PHYS is set to one (1), all addresses and block counts are in terms of physical sectors.
Allocation Length. This field specifies the number of bytes that the Initiator has allocated for
returned ACCESS LOG data. An Allocation Length of zero indicates that no ACCESS LOG
data will be transferred. This condition shall not be considered as an error. Any other value
indicates the maximum number of bytes that shall be transferred. The Target will terminate
the Data In phase when the specified number of bytes have been transferred, or when all
available ACCESS LOG data have been transferred to the Initiator, whichever is less ..
8-2 Vendor Unique Command Descriptions
DRAFT
1/18/93 09:58