SDA Commands and Mode Pages (94-042r2)
George Penokie
GOP at rchvmp3.vnet.ibm.com
Tue Mar 8 09:19:23 PST 1994
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Date: Mar 01,1994 X3T10/94-042 rev 2
To: X3T9.2 Committee (SCSI)
From: George Penokie (IBM)
Subject: SDA Commands and Mode Pages
1.0 Overview
To control and configure a SCSI-3 Disk Array several new
commands and mode pages are required. This proposal defines
| those commands and mode pages. All the listed commands and
| mode pages are only valid for the Base Device Address (P-LUI
| LUN zero) on SDA device types.
| An Inquiry command addressed to a volume set shall indicate
| a Peripheral device type equivalent to the devices that makeup
| the volume set (e.g. direct-access device, sequential-access
| device, etc.).
| <<Editors Note: A bit will be added to the Standard Inquiry
| data format to indicate the LUN is a Volume Set. The name of
| the bit should be SDAVol. The following text should be added
| to the Inquiry command description:
| A SDA Volume Set Addressed (SDAVol) bit of one indicates the
| addressed device is a volume set that is configured within a
| SDA device. GOP>>
<<Editors Note: This pass only contains an outline of the
commands and mode pages GOP>>
2.0 Extents
2.1 P-extent
All P-extents contain the following information:
-Physical Logical Unit Identifier (P-LUI) 2 bytes
-Start P-LBA 4 bytes
-Number of P-LBAs 4 bytes
-Number of Bytes per P-LBA 2 bytes
Note:For variable block length device types the number of
bytes per P-LBA field shall be set to zero.
2.2 PS-extent
All PS-extents contain the following information:
-Physical Logical Unit Identifier (P-LUI) 2 bytes
-Start PS-LBA 4 bytes
-Number of PS-LBAs 4 bytes
-Number of Bytes per PS-LBA 2 bytes
Note:For variable block length device types the number of
bytes per P-LBA field shall be set to zero.
3.0 Maintenance Operations
3.1 Report P-LUI Command
The CDB would contain the following:
| -Report all or Selected P-LUIs (S) 1 bit
| -Physical Logical Unit Identifier (P-LUI) (S) 2 bytes
This command would return the following parameter list:
-Physical Logical Unit Identifier (P-LUI) (R) 2 bytes
-Peripheral Device Type (1 per P-LUI) 1 byte
-Replaceable Unit (1 per P-LUI) 1 bit
-State of the P-LUI (1 per P-LUI) 1 byte
Note:Any parameters indicated by a (R) may be repeated. Any
parameters indicated by a (S) shall only occur once per
service request.
| 5.1.2 Attach C-LUI Service
This command would send the following parameter list:
| -Component Logical Unit Identifier (C-LUI) (S) 2 bytes
| -Redundancy Group Logical Unit Identifier (R-LUI) (R) 2 bytes
| -Attached P-LUI (R) 2 bytes
| -Attached C-LUI (R) 2 bytes
| Note:Any parameters indicated by a (R) may be repeated. Any
| parameters indicated by a (S) shall only occur once per
| service request.
|
| 5.1.2 Report C-LUI Service
| The CDB would contain the following:
| -Report all or Selected C-LUIs (S) 1 bit
| -Component Logical Unit Identifier (C-LUI) (S) 2 bytes
| This command would return the following parameter list:
| -Component Logical Unit Identifier (C-LUI) (R) 2 bytes
| -Component Type (1 per C-LUI) 1 byte
| -Replaceable Unit (1 per C-LUI) 1 bit
| -State of the C-LUI (1 per C-LUI) 1 byte
| -Redundancy Group Logical Unit Identifier (R-LUI)(x per C-LUI) 2 bytes
| -Attached P-LUI (x per C-LUI) 2 bytes
| -Attached C-LUI (x per C-LUI) 2 bytes
|
| Note:Any parameters indicated by a (R) may be repeated. Any
| parameters indicated by a (S) shall only occur once per
| service request.
| 3.2 Report P-LUI/C-LUI Identifier Command
The CDB would contain the following:
| -Report P-LUI or C-LUI Identifier (S) 1 bit
| -Logical Unit Identifier (P-LUI or C-LUI)(S) 2 bytes
This command would return the following parameter list:
-Identifier Variable
| 3.3 Set P-LUI/C-LUI Identifier Command
The CDB would contain the following:
| -Set P-LUI or C-LUI Identifier (S) 1 bit
| -Logical Unit Identifier (P-LUI or C-LUI)(S) 2 bytes
This command would send the following parameter list:
-Identifier Variable
3.4 Report P-Extent Command
The CDB would contain the following:
| -Report all or Selected P-extents (S) 1 bit
| -Physical Logical Unit Identifier (P-LUI) (S) 2 bytes
| -Report assigned/unassigned P-Extents (S) 1 bit
This command would return the following parameter list:
-P-extent (R) 12 bytes
-Peripheral Device Type (1 per P-extent) 1 byte
-State of the P-extent (1 per P-extent) 1 byte
| 3.5 Exchange P-LUI/C-LUI Command (Immediate bit in CDB)
The CDB would contain the following:
| -Select P-LUI or C-LUI for Exchange (S) 1 bit
| -Old P-LUI or C-LUI (S) 2 bytes
| -New P-LUI or C-LUI (S) 2 bytes
| 3.6 Remove P-LUI/C-LUI Command
The CDB would contain the following:
| -Select P-LUI or C-LUI to Remove (S) 1 bit
| -P-LUI or C-LUI (S) 2 bytes
| 5.1.10 Add P-LUI/C-LUI Service
| The CDB would contain the following:
| -Select P-LUI or C-LUI for Add (S) 1 bit
| -P-LUI or C-LUI (S) 2 bytes
3.7 Exchange P-extent Command (Immediate bit in CDB)
This command would send the following parameter list:
-Old P-extent (S) 12 bytes
-New P-extent (S) 12 bytes
3.8 Set Method of Reporting Informational Exception
Conditions Mode Page
A SDA mode page would contain the following:
-Method of Reporting Informational Exceptions (S) 1 byte
-Log Informational Exceptions (S) 1 bit
4.0 Redundancy Group Operations
4.1 Create/Modify Redundancy Group Command (Immediate bit in CDB)
This command would send the following parameter list:
-Redundancy Group Logical Unit Identifier (R-LUI) (S) 2 bytes
-Recalculate check data (S) 2 bits
-Granularity of Units (bit, byte, logical block, etc.) (S) 1 byte
-P-Extent (R) 12 bytes
-Preserve protected space (1 per P-extent) 2 bits
-Set protected space to known value (1 per P-extent) 9 bits
-Redundancy Type Identifier (1 per P-extent) 1 byte
-Start check data interleave P-LBA (1 per P-extent) 4 bytes
-Number of units of check data (1 per P-extent) 4 bytes
-Number of units of user data (1 per P-extent) 4 bytes
4.2 Report Redundancy Groups Command
The CDB would contain the following:
-Report all R-LUIs (Yes/No) (S) 1 bit
-Redundancy Group Logical Unit Identifier (R-LUI) (S) 2 bytes
This command would return the following parameter list:
-Redundancy Group Logical Unit Identifier (R-LUI) (R) 2 bytes
-Redundancy Type Identifier (1 per R-LUI) 1 byte
-Granularity of Units (bit, byte, etc.) (1 per R-LUI) 1 byte
-State of the Redundancy Group (1 per R-LUI) 1 byte
-P-Extent (x per R-LUI) 12 bytes
-Start Check Data Interleave P-LBA (1 per P-extent) 4 bytes
-Number of units of check data (1 per P-extent) 4 bytes
-Number of units of user data (1 per P-extent) 4 bytes
4.3 Report Unassigned Redundancy Group Space Command
The CDB would contain the following:
-Report all unassigned R-LUIs (Yes/No) (S) 1 bit
-Redundancy Group Logical Unit Identifier (R-LUI) (S) 2 bytes
This command would return the following parameter list:
-Redundancy Group Logical Unit Identifier (R-LUI) (R) 2 bytes
-Redundancy Type Identifier (1 per R-LUI) 1 byte
-State of the Redundancy Group (1 per R-LUI) 1 byte
-PS-extent (x per R-LUI) 12 bytes
4.4 Delete Redundancy Group Command
The CDB would contain the following:
-Redundancy Group Logical Unit Identifier (R-LUI) (S) 2 bytes
4.5 Recalculate Check Data Command (Immediate bit in CDB)
The CDB would contain the following:
-Redundancy Group Logical Unit Identifier (R-LUI) (S) 2 bytes
4.6 Verify Check Data Command (Immediate bit in CDB)
The CDB would contain the following:
-Redundancy Group Logical Unit Identifier (R-LUI) (S) 2 bytes
4.6.1 Verify Check Data Mode Page
A SDA mode page would contain the following:
-Enable/Disable Continuous Verification (S) 1 bit
4.7 Control Generation of Check Data Mode Page
A SDA mode page would contain the following:
-Redundancy Group Logical Unit Identifier (R-LUI) (S) 2 bytes
-Enable/Disable Check Data (S) 1 bit
4.8 Rebuild P-extent Command (Immediate bit in CDB)
This command would send the following parameter list:
-P-extent (S) 12 bytes
-Redundancy Group Logical Unit Identifier (R-LUI) (R) 2 bytes
4.9 Rebuild P-LUI Command (Immediate bit in CDB)
This command would send the following parameter list:
-P-LUI (S) 2 bytes
-Redundancy Group Logical Unit Identifier (R-LUI) (R) 2 bytes
5.0 Volume Set Operations
5.1 Create/Modify Volume Set Command (Immediate bit in CDB)
This command would send the following parameter list:
-Volume Set Logical Unit Identifier (V-LUI) (S) 2 bytes
-PS-extent Stripe Length (S) 4 bytes
-PS-extent Interleave Depth (S) 4 bytes
-Granularity of Units (bit, byte, logical block, etc.) (S) 1 byte
-PS-extent (R) 12 bytes
-User Data Stripe Depth (1 per PS-extent) 4 bytes
-Increment/Decrement PS-LBA Count (1 per PS-extent) 4 bytes
5.2 Report Volume Sets Command
The CDB would contain the following:
-Report all V-LUIs (Yes/No) (S) 1 bit
-Volume Set Logical Unit Identifier (V-LUI) (S) 2 bytes
| This command would return the following parameter list:
-Volume Set Logical Unit Identifier (V-LUI) (R) 2 bytes
-PS-extent Stripe Length (1 per V-LUI) 4 bytes
-PS-extent Interleave Depth (1 per V-LUI) 4 bytes
-Granularity of Units (bit, byte, etc.) (1 per V-LUI) 1 byte
-State of the Volume Set (1 per V-LUI) 1 byte
-PS-extent (x per V-LUI) 12 bytes
-User Data Stripe Depth (1 per PS-extent) 4 byte
-Increment/Decrement PS-LBA Count (1 per PS-extent) 1 bit
5.3 Delete Volume Set Command
The CDB would contain the following:
-Volume Set Logical Unit Identifier (V-LUI) (S) 2 bytes
5.4 Recalculate V-LUI Check Data Command (Immediate bit in
CDB)
The CDB would contain the following:
-Volume Set Logical Unit Identifier (V-LUI) (S) 2 bytes
This command would send the following parameter list:
-Start V-LBA (S) 4 bytes
-Number of V-LBAs (S) 4 bytes
5.5 Verify V-LBA Check Data Command (Immediate bit in CDB)
The CDB would contain the following:
-Volume Set Logical Unit Identifier (V-LUI) (S) 2 bytes
This command would send the following parameter list:
-Start V-LBA (S) 4 bytes
-Number of V-LBAs (S) 4 bytes
5.5.1 Verify Check Data Mode Page (Immediate bit in CDB)
A SDA mode page would contain the following:
-Enable/Disable Continuous Verification (S) 1 bit
5.6 Control Generation of Check Data Mode Page
A SDA mode page would contain the following:
-Volume Set Logical Unit Identifier (V-LUI) (S) 2 bytes
-Enable/Disable Check Data (S) 1 bit
5.7 Control Write Operations Mode Page
A SDA mode page would contain the following:
-Volume Set Logical Unit Identifier (V-LUI) (S) 2 bytes
-Enable/Disable Write Operations (S) 1 bit
6.0 Spare Operations
6.1 Create/Modify P-extent Spare Command (Immediate bit in CDB)
This command would send the following parameter list:
-Spare Logical Unit Identifier (S-LUI) (S) 2 bytes
-P-Extent (S) 12 bytes
-Redundancy Group Logical Unit Identifier (R-LUI) (R) 1 bytes
-Associated P-Extent (R) 12 bytes
6.2 Report P-extent Spare Command
The CDB would contain the following:
-Report all P-extent Spares (Yes/No) (S) 1 bit
-Spare Logical Unit Identifier (S-LUI) (S) 2 bytes
| This command would return the following parameter list:
-Spare Logical Unit Identifier (S-LUI) (R) 2 bytes
-P-Extent (1 per S-LUI) 12 bytes
-State of the spare (1 per S-LUI) 1 byte
-Redundancy Group Logical Unit Identifier (R-LUI)(x per S-LUI) 2 bytes
-Associated P-Extent (x per S-LUI) 12 bytes
| 6.3 Create/Modify P-LUI/C-LUI Spare Command (Immediate bit in
| CDB)
The CDB would contain the following:
| -Create/Modify P-LUI or C-LUI Spare (S) 1 bit
This command would send the following parameter list:
-Spare Logical Unit Identifier (S-LUI) (S) 2 bytes
-P-LUI or C-LUI (S) 2 bytes
-Redundancy Group Logical Unit Identifier (R-LUI) (R) 2 bytes
-Associated P-LUI (R) 2 bytes
| -Associated C-LUI (R) 2 bytes
| 6.4 Report P-LUI/C-LUI Spare Command
The CDB would contain the following:
| -Report P-LUI Spares or C-LUI Spares (S) 1 bit
| -Report all P-LUI Spares or C-LUI Spares (Yes/No) (S) 1 bit
-Spare Logical Unit Identifier (S-LUI) (S) 2 bytes
| This command would return the following parameter list:
-Spare Logical Unit Identifier (S-LUI) (R) 2 bytes
| -P-LUI or C-LUI (1 per S-LUI) 2 bytes
-State of the spare (1 per S-LUI) 1 byte
-Redundancy Group Logical Unit Identifier (R-LUI)(x per S-LUI) 2 bytes
-Associated P-LUI (x per S-LUI) 2 bytes
| -Associated C-LUI (x per S-LUI) 2 bytes
6.5 Delete Spare Command
The CDB would contain the following:
-Spare Logical Unit Identifier (S-LUI) (S) 2 bytes
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