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Chapter 4 SCSI Commands
Overview of SCSI Command and Status Processing
DLT-S4 Interface Reference Guide
27
The Data Out column in
table 13
lists the information the initiator passes
to the drive as part of the command. The Data In column lists the
information the drive sends to the initiator. Numbers in parentheses after
an item indicate the item’s length in bytes. In some cases, additional
length information is communicated during DATA.
Table 13 Command Contents
Command
Length in CDB
Data Out (to drive)
Data In (from drive)
ERASE
0
---
---
INQUIRY
Allocation
---
Standard Inquiry or a Vital
Product Data page
LOAD UNLOAD
0
---
---
LOCATE
0
---
---
LOG SELECT
Parameter List
Write Error Count
Page, Read Error
Count Page, and
Compression Ratio
Page
---
LOG SENSE
Allocation
---
Log Page
MODE
SELECT (6) / (10)
Parameter List
Mode Parameter
Header (4) Block
Descriptor (8) Page(s)
---
MODE
SENSE (6) / (10)
Allocation
---
Mode Parameter Header (4)
Block Descriptor (8) Page(s)
PERSISTENT RESERVE IN
Allocation
---
Parameter Data
PERSISTENT RESERVE
OUT
Parameter Length
Parameter List
---
PREVENT ALLOW MEDIUM
REMOVAL
0
---
---
READ
Transfer
---
Data
READ BLOCK LIMITS
0
---
Block Length Limits
READ BUFFER
Allocation
---
Buffer Offset and Allocation
Length and/ or Test Data
READ POSITION
Determined by
Long Bit
---
Position Identifier or
SCSI Logical Address