What's New as of August 10th, 1995

Changes For This Release

The following changes have been made to scu for this release: That's it for now. See scu help file for additional information. As always, send mail directly to me if you encounter any problems and/or have questions.

Within Compaq, the updated scu kits are located @ URL:

http://www.zk3.dec.com/~rmiller/scu.html


Mail Send mail to admin of this page: [email protected] Home To Robin's home page.

Last modified: December 29th, 1999


Examples:


Examples of Mode Page extensions:

imfaster% scu
scu> set nexus pid 1 tid 0 lun 0
Device: RWZ52, Bus: 1, Target: 0, Lun: 0, Type: Optical
scu> show pages supported
Mode Pages Supported by Device [1/0/0] (RWZ52):

Read-Write Error Recovery Page (0x01), Page Length 10 (0x0a), Savable Yes
     Disconnect-Reconnect Page (0x02), Page Length 14 (0x0e), Savable Yes
      Rigid Disk Geometry Page (0x04), Page Length 22 (0x16), Savable No
           Optical Memory Page (0x06), Page Length  2 (0x02), Savable Yes
    Verify Error Recovery Page (0x07), Page Length 10 (0x0a), Savable Yes
            Cache Control Page (0x08), Page Length 10 (0x0a), Savable Yes
   Medium Types Supported Page (0x0b), Page Length  6 (0x06), Savable Yes
          Vendor Specific Page (0x20), Page Length 12 (0x0c), Savable Yes
          Vendor Specific Page (0x21), Page Length 10 (0x0a), Savable Yes

scu> show page vendor 0x21

Vendor Specific Parameters (Page 0x21 - Current Values):

Mode Parameter Header:

                  Mode Data Length: 23
                       Medium Type: 0x3 (Reversible or Erasable medium)
         Device Specific Parameter: 0x10 (Supports cache memory)
           Block Descriptor Length: 8

Mode Parameter Block Descriptor:

                      Density Code: 0xa
          Number of Logical Blocks: 1163337
              Logical Block Length: 512

Page Header / Data:
                         Page Code: 0x21
                Parameters Savable: Yes
                       Page Length: 10
 Direct Access Inquiry Resp (DAIR): No
 Disable Tgt Initiated Sync (DTIS): Yes
         Disable Auto Spinup (DAS): No
       Reset Configuration (Reset): Off (hard reset)
   Correction Manager Log (CM Log): Disabled
        Drive Manager Log (DM Log): Disabled
 Digital Signal Proc Log (DSP Log): Disabled
 Extended Recovery Reporting (ERR): No
 Timestamps for Q Log and Task Log: Disabled
Task Log Change Logging (Task Log): Disabled
    Priority Queue Logging (Q Log): Disabled
  Disable Log Thresold Warn (DLTW): Yes
        Force Verify on ALL Writes: Yes
       Reserved (byte 3, bits 5:7): 0x2
            Maximum Buffer Latency: 1000ms
                 Drive Retry Count: 2
        Autochanger Eject Distance: 150 (1.5 millimeters)
      SCSI Phase Retry Error Count: 5

scu>


Examples of "show layout" command and setting individual page fields: scu> set nexus pid 1 tid 0 lun 0 Device: RWZ52, Bus: 1, Target: 0, Lun: 0, Type: Optical scu> show layout cache Cache Control Page Layout (Page 0x8) Field Description & Offset/Bit Information Set Name ------------------------------------------ -------- Read Cache Disable (RCD) (byte 2, bit 0) -> rcd Multiplication Factor (MF) (byte 2, bit 1) -> mf Write Cache Enable (WCE) (byte 2, bit 2) -> wce Reserved (byte 2, bits 3:7) -> Write Retention Priority (byte 3, bits 0:3) -> write_retention_pri Demand Read Retention Priority (byte 3, bits 4:7) -> demand_read_ret_pri Disable Prefetch Transfer Length (bytes 4-5) -> prefetch_xfer_len Minimum Prefetch (bytes 6-7) -> minimum_prefetch Maximum Prefetch (bytes 8-9) -> maximum_prefetch Maximum Prefetch Ceiling (bytes 10-11) -> max_prefetch_ceiling scu> show page cache Cache Control Parameters (Page 0x8 - Current Values): Mode Parameter Header: Mode Data Length: 23 Medium Type: 0x3 (Reversible or Erasable medium) Device Specific Parameter: 0x10 (Supports cache memory) Block Descriptor Length: 8 Mode Parameter Block Descriptor: Density Code: 0xa Number of Logical Blocks: 1163337 Logical Block Length: 512 Page Header / Data: Page Code: 0x8 Parameters Savable: Yes Page Length: 10 Read Cache Disable (RCD): No Multiplication Factor (MF): Off Write Cache Enable (WCE): No Write Retention Priority: 0 (Not distiguished) Demand Read Retention Priority: 0 (Not distiguished) Disable Prefetch Transfer Length: 65535 blocks Minimum Prefetch: 4 blocks Maximum Prefetch: 8 blocks Maximum Prefetch Ceiling: 0 blocks scu> set default savable off scu> set page cache rcd yes wce on Setting Cache Control Parameters (Page 0x8 - Current Values): scu> show page cache Cache Control Parameters (Page 0x8 - Current Values): Mode Parameter Header: Mode Data Length: 23 Medium Type: 0x3 (Reversible or Erasable medium) Device Specific Parameter: 0x10 (Supports cache memory) Block Descriptor Length: 8 Mode Parameter Block Descriptor: Density Code: 0xa Number of Logical Blocks: 1163337 Logical Block Length: 512 Page Header / Data: Page Code: 0x8 Parameters Savable: Yes Page Length: 10 Read Cache Disable (RCD): Yes Multiplication Factor (MF): Off Write Cache Enable (WCE): Yes Write Retention Priority: 0 (Not distiguished) Demand Read Retention Priority: 0 (Not distiguished) Disable Prefetch Transfer Length: 65535 blocks Minimum Prefetch: 4 blocks Maximum Prefetch: 8 blocks Maximum Prefetch Ceiling: 0 blocks scu>
Example of switch RWZ52 Optical to Direct-Access mode: scu> set nexus pid 1 tid 0 lun 0 Device: RWZ52, Bus: 1, Target: 0, Lun: 0, Type: Optical scu> show inquiry Inquiry Information: Peripheral Device Type: 0x7 (Optical) Peripheral Qualifier: 0 (Peripheral Device Connected) Device Type Modifier: 0 Removable Media: Yes ANSI Version: 2 (Complies to ANSI X3.131-1994, SCSI-2) ECMA Version: 0 ISO Version: 0 Response Data Format: 2 (SCSI-2) Terminate I/O Process: 0 Asynchronous Notification: 0 Additional Length: 51 Soft Reset Support: No Command Queuing Support: No Target Transfer Disable: No Linked Command Support: No Synchronous Data Transfers: Yes Support for 16 Bit Transfers: No Support for 32 Bit Transfers: No Relative Addressing Support: No Vendor Identification: DEC Product Identification: RWZ52 (C)DEC Firmware Revision Level: 3404 Vendor Specific Data: 33 33 35 31 00 0a 02 00 00 00 00 00 00 00 "3351 " 00 00 00 00 00 00 " " scu> show layout vendor 0x21 Vendor Specific Page Layout (Page 0x21) Field Description & Offset/Bit Information Set Name ------------------------------------------ -------- Direct Access Inquiry Resp (DAIR) (byte 2, bit 0) -> dair Disable Tgt Initiated Sync (DTIS) (byte 2, bit 1) -> dtis Disable Auto Spinup (DAS) (byte 2, bit 2) -> das Reset Configuration (Reset) (byte 2, bit 3) -> reset Correction Manager Log (CM Log) (byte 2, bit 4) -> cmlog Drive Manager Log (DM Log) (byte 2, bit 5) -> dmlog Digital Signal Proc Log (DSP Log) (byte 2, bit 6) -> dsplog Extended Recovery Reporting (ERR) (byte 2, bit 7) -> err Timestamps for Q Log and Task Log (byte 3, bit 0) -> timestamp Task Log Change Logging (Task Log) (byte 3, bit 1) -> tasklog Priority Queue Logging (Q Log) (byte 3, bit 2) -> qlog Disable Log Thresold Warn (DLTW) (byte 3, bit 3) -> dltw Force Verify on ALL Writes (byte 3, bit 4) -> force_verify Reserved (byte 3, bits 5:7) -> Maximum Buffer Latency (bytes 4-7) -> buffer_latency Drive Retry Count (byte 8) -> drive_retrys Autochanger Eject Distance (byte 9) -> eject_distance SCSI Phase Retry Error Count (byte 10) -> phase_retrys Reserved (byte 11) -> scu> scu> set page vendor 0x21 dair on Setting & Saving Vendor Specific Parameters (Page 0x21 - Current Values): scu> show inquiry Inquiry Information: Peripheral Device Type: 0 (Direct Access) Peripheral Qualifier: 0 (Peripheral Device Connected) Device Type Modifier: 0 Removable Media: Yes ANSI Version: 2 (Complies to ANSI X3.131-1994, SCSI-2) ECMA Version: 0 ISO Version: 0 Response Data Format: 2 (SCSI-2) Terminate I/O Process: 0 Asynchronous Notification: 0 Additional Length: 51 Soft Reset Support: No Command Queuing Support: No Target Transfer Disable: No Linked Command Support: No Synchronous Data Transfers: Yes Support for 16 Bit Transfers: No Support for 32 Bit Transfers: No Relative Addressing Support: No Vendor Identification: DEC Product Identification: RWZ52 (C)DEC Firmware Revision Level: 3404 Vendor Specific Data: 33 33 35 31 00 0a 02 00 00 00 00 00 00 00 "3351 " 00 00 00 00 00 00 " " scu>
Examples of displaying all page control fields (tty width was 100 columns): scu> show pages pcf all Mode Page Parameters for Device [1/0/0] (RWZ52): Current Pages: Mode Header & Block Descriptor: 00 80 03 10 00 00 00 08 0a 11 c0 49 00 00 02 00 Read-Write Error Recovery Page: 81 0a a0 05 00 00 00 00 02 00 00 00 Disconnect-Reconnect Page: 82 0e 80 00 00 00 00 00 00 00 00 20 00 00 00 00 Rigid Disk Geometry Page: 04 16 00 92 96 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 09 60 00 00 Optical Memory Page: 86 02 00 00 Verify Error Recovery Page: 87 0a 00 05 00 00 00 00 00 00 00 00 Cache Control Page: 88 0a 05 00 ff ff 00 04 00 08 00 00 Medium Types Supported Page: 8b 06 00 00 02 03 00 00 Vendor Specific Page: a0 0c 00 00 01 00 00 00 00 00 00 1f 00 00 Vendor Specific Page: a1 0a 02 58 00 00 03 e8 02 96 05 00 Changeable Pages: Mode Header & Block Descriptor: 00 80 00 00 00 00 00 08 00 00 00 00 00 00 00 00 Read-Write Error Recovery Page: 81 0a a7 ff 00 00 00 00 ff 00 00 00 Disconnect-Reconnect Page: 82 0e ff 00 00 00 00 00 00 00 ff ff 00 00 00 00 Rigid Disk Geometry Page: 04 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 Optical Memory Page: 86 02 00 00 Verify Error Recovery Page: 87 0a 05 ff 00 00 00 00 00 00 00 00 Cache Control Page: 88 0a 05 00 ff ff ff ff ff ff 00 00 Medium Types Supported Page: 8b 06 00 00 00 00 00 00 Vendor Specific Page: a0 0c 00 ff ff ff ff ff ff ff ff 00 00 00 Vendor Specific Page: a1 0a ff ff ff ff ff ff ff ff ff 00 Default Pages: Mode Header & Block Descriptor: 00 80 03 10 00 00 00 08 0a 11 c0 49 00 00 02 00 Read-Write Error Recovery Page: 81 0a 80 08 00 00 00 00 02 00 00 00 Disconnect-Reconnect Page: 82 0e 80 00 00 00 00 00 00 00 00 20 00 00 00 00 Rigid Disk Geometry Page: 04 16 00 92 96 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 09 60 00 00 Optical Memory Page: 86 02 00 00 Verify Error Recovery Page: 87 0a 00 05 00 00 00 00 00 00 00 00 Cache Control Page: 88 0a 04 00 ff ff 00 08 00 08 00 00 Medium Types Supported Page: 8b 06 00 00 02 03 00 00 Vendor Specific Page: a0 0c 00 00 00 00 00 00 00 00 00 1f 00 00 Vendor Specific Page: a1 0a 02 08 00 00 03 e8 02 96 05 00 Saved Pages: Mode Header & Block Descriptor: 00 80 03 10 00 00 00 08 0a 11 c0 49 00 00 02 00 Read-Write Error Recovery Page: 81 0a a0 05 00 00 00 00 02 00 00 00 Disconnect-Reconnect Page: 82 0e 80 00 00 00 00 00 00 00 00 20 00 00 00 00 Rigid Disk Geometry Page: 04 16 00 92 96 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 09 60 00 00 Optical Memory Page: 86 02 00 00 Verify Error Recovery Page: 87 0a 00 05 00 00 00 00 00 00 00 00 Cache Control Page: 88 0a 00 00 ff ff 00 04 00 08 00 00 Medium Types Supported Page: 8b 06 00 00 02 03 00 00 Vendor Specific Page: a0 0c 00 00 00 00 00 00 00 00 00 1f 00 00 Vendor Specific Page: a1 0a 02 58 00 00 03 e8 02 96 05 00 scu> scu> show page cache pcf all Mode Page Parameters for Device [1/0/0] (RWZ52): Cache Control Page (0x08): Headers: 17 03 10 08 0a 11 c0 49 00 00 02 00 Current: 88 0a 05 00 ff ff 00 04 00 08 00 00 Changeable: 88 0a 05 00 ff ff ff ff ff ff 00 00 Default: 88 0a 04 00 ff ff 00 08 00 08 00 00 Saved: 88 0a 00 00 ff ff 00 04 00 08 00 00 scu>
Example of Dynamic Bad Block Replacement enhancement & "show defects" display: scu> show capacity Disk Capacity Information: Maximum Capacity: 409792 (200.094 megabytes) Block Length: 512 scu> scu> verify media starting 409700 dbbr on Verifying 92 blocks (409700 - 409791) on /dev/rrz0c (RZ24), please be patient... Verifying blocks [ 409700 through 409791 ]... scu: Verify error at logical block number 409725 (0x6407d). scu: Sense Key = 0x3 = MEDIUM ERROR - Nonrecoverable medium error, Sense Code/Qualifier = (0x11, 0) = Unrecovered read error Attempting to reassign logical block 409725 on /dev/rrz0c (RZ24)... WARNING: Unable to read data, but continuing with reassign... scu: Verify error at logical block number 409750 (0x64096). scu: Sense Key = 0x3 = MEDIUM ERROR - Nonrecoverable medium error, Sense Code/Qualifier = (0x11, 0) = Unrecovered read error Attempting to reassign logical block 409750 on /dev/rrz0c (RZ24)... scu> show defects grown Displaying Grown Defect List in Physical Sector Format ( Defect list length is 24 bytes, containing 3 defects ) Cylinder 742, Head 5, Sector 28 Cylinder 1355, Head 1, Sector 9 Cylinder 1355, Head 1, Sector 34 scu>
Example of controlling auto-sense and requesting sense information: scu> set cam flags 0x400|0x20 scu> eject scu> tur scu: 'test unit ready' failed, EIO (5) - I/O error scu> zero sense scu> show sense Request Sense Information: Error Code: 0x70 (Current Error) Valid Bit: 0 Segment Number: 0 Sense Key: 0x2 (NOT READY - Logical unit is NOT ready) Illegal Length: 0 End Of Media: 0 File Mark: 0 Information Field: 0 Additional Sense Length: 0xa Command Specific Information: 0 Additional Sense Code/Qualifier: (0x3a, 0) = Medium not present Field Replaceable Unit Code: 0 Sense Specific Bytes: 00 00 00 scu>
Example of changing device block length: % scu -f /dev/rrz4c scu> show nexus Device: RRD43, Bus: 0, Target: 4, Lun: 0, Type: Read-Only Direct Access scu> show capacity Disk Capacity Information: Maximum Capacity: 400200 (195.410 megabytes) Block Length: 512 scu> set device length 2048 scu> show capacity Disk Capacity Information: Maximum Capacity: 100050 (195.410 megabytes) Block Length: 2048 scu>