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62 SCSI Commands
Read Buffer – 3Ch
What the Library Does With This Command
The library will return requested buffer descriptor information or buffer data.
Command Usage
This command can be used primarily for enhanced domain validation. The initiator can use Descriptor mode
first to determine the size of the data available to read, followed by Data mode to then read it. Depending
on the size of the requested buffer, it can also be retrieved in blocks, utilizing offsets into the buffer.
Read Buffer CDB Format
The READ BUFFER CDB format is shown in the following table.
Mode – The supported modes are:
• 2h – Data
• 3h – Descriptor
• Ah – Echo Buffer
• Bh – Echo Buffer Descriptor
In Data Mode, data is transferred from the buffer specified by the Buffer ID field. Buffer IDs are assigned
beginning with zero, and are assigned contiguously. Buffer ID code assignments for the READ BUFFER
command are the same as for the WRITE BUFFER command.
In Descriptor Mode, a maximum of four bytes of READ BUFFER descriptor information is returned. The
library returns the descriptor information for the buffer specified by the buffer ID. If there is no buffer
associated with the specified Buffer ID, all zeros are returned in the READ BUFFER descriptor. The Buffer
Offset field is reserved in this mode. The allocation length should be set to at least four for this mode. See
Table 60
on page 63 for a definition of the READ BUFFER descriptor.
Table 59 READ BUFFER CDB format
Bit
Byte
76543210
0 Op Code (3Ch)
1 Logical Unit Number Rsvd Mode
2 Buffer ID
3
:
5
Buffer Offset
6
:
8
Allocation Length
9 Control
- Scalar Intelligent Libraries 1
- Contents 3
- SCSI Command Support 11
- 2 SCSI Command Support 12
- do not support this command 13
- 4 SCSI Command Support 14
- Element Addressing 15
- Command Status 15
- Multiple Initiator Support 15
- Unit Attentions 16
- Common CDB Fields 16
- Supported Interfaces 17
- 8 SCSI Command Support 18
- Logical Libraries 19
- Mailbox Behavior 19
- Autocleaning 20
- Removed Drives 20
- SCSI Commands 21
- 12 SCSI Commands 22
- Command Usage 23
- 14 SCSI Commands 24
- Inquiry - 12h 25
- Standard Inquiry Response 26
- 18 SCSI Commands 28
- Vital Product Data Pages 29
- Unit Serial Number Page (80h) 30
- Identification Descriptors 31
- 24 SCSI Commands 34
- Log Sense - 4Dh 35
- Log Sense Response 36
- Supported Log Page (00h) 38
- Tape Alert Log Page (2Eh) 38
- Mode Select (6) - 15h 40
- Mode Parameter Header 41
- Mode Select (10) - 55h 42
- Mode Sense (6) - 1Ah 44
- Mode Sense (6) Response 45
- Mode Sense (10) - 5Ah 46
- Mode Sense (10) Response 47
- Mode Pages 48
- 40 SCSI Commands 50
- 42 SCSI Commands 52
- 44 SCSI Commands 54
- All Mode Pages (3Fh) 56
- Move Medium – A5h 57
- Move Medium CDB Format 58
- Persistent Reserve In – 5Eh 59
- Read Keys Response 60
- Read Reservations Response 61
- Report Capabilities Response 62
- Report Full Status 63
- 54 SCSI Commands 64
- Persistent Reserve Out – 5Fh 65
- 56 SCSI Commands 66
- Transport IDs 68
- Position to Element – 2Bh 70
- Read Buffer – 3Ch 72
- Read Buffer Response 73
- 64 SCSI Commands 74
- Read Element Status – B8h 75
- 66 SCSI Commands 76
- Read Element Status Response 77
- Element Descriptors 78
- Primary Volume Tag Field 79
- Storage Element Descriptor 80
- 72 SCSI Commands 82
- Release Element – 17h 84
- Report LUNS – A0h 85
- Report LUNS Response 86
- Request Sense – 03h 87
- Request Sense Response 88
- 80 SCSI Commands 90
- 82 SCSI Commands 92
- 84 SCSI Commands 94
- Reserve Element - 16h 96
- Send Diagnostic - 1Dh 97
- Send Volume Tag - B6h 98
- Test Unit Ready (00h) 100
- Write Buffer (3Bh) 101
- 92 SCSI Commands 102
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