dasdview - Display DASD structure
Use the dasdview command to display DASD information. dasdview displays:
- The volume label.
- VTOC details (general information, and the DSCBs of format 1, format 3, format 4, format 5, format 7, format 8, and format 9).
- The content of the DASD, by specifying:
- Starting point
- Size
- Device characteristics, such as:
- Whether the data on the DASD is encrypted.
- Whether the disk is a solid-state device.
If you specify a start point and size, you can also display the contents of a disk dump.
dasdview syntax
Where:
- -b <begin> or --begin=<begin>
- displays disk content on the console, starting from <begin>.
The contents of the disk are displayed as hexadecimal numbers,
ASCII text, and EBCDIC text. If <size> is
not specified, dasdview takes the default
size (128 bytes). You can specify the variable <begin> as:
<begin>[k|m|b|t|c]If the disk is in raw-track access mode, you can specify only track (t) or cylinder (c) entities.
The default for <begin> is 0.
dasdview displays a disk dump on the console by using the DASD driver. The DASD driver might suppress parts of the disk, or add information that is not relevant. This discrepancy might occur, for example, when dasdview displays the first two tracks of a disk that was formatted with the compatible disk layout option (-d cdl). In this situation, the DASD driver pads shorter blocks with zeros to maintain a constant blocksize. All Linux® applications (including dasdview) process according to this rule.
Here are some examples of how this option can be used:-b 32 (start printing at Byte 32) -b 32k (start printing at kByte 32) -b 32m (start printing at MByte 32) -b 32b (start printing at block 32) -b 32t (start printing at track 32) -b 32c (start printing at cylinder 32) - -s <size> or --size=<size>
- displays a disk dump on the console, starting at <begin>,
and continuing for size=<size>.
The contents of the dump are displayed as hexadecimal numbers,
ASCII text, and EBCDIC text. If a start value, <begin>,
is not specified, dasdview takes the default.
You can specify the variable <size> as:
size[k|m|b|t|c]If the disk is in raw-track access mode, you can specify only track (t) or cylinder (c) entities.
The default for <size> is 128 bytes.
Here are some examples of how this option can be used:-s 16 (use a 16 Byte size) -s 16k (use a 16 kByte size) -s 16m (use a 16 MByte size) -s 16b (use a 16 block size) -s 16t (use a 16 track size) -s 16c (use a 16 cylinder size) - -1
- displays the disk dump with format 1 (as 16 Bytes per line in
hexadecimal, ASCII and EBCDIC). A line number is not displayed. You
can use option -1 only together with -b or -s.
Option -1 is the default.
- -2
- displays the disk dump with format 2 (as 8 Bytes per line in hexadecimal, ASCII and EBCDIC). A decimal and hexadecimal byte count are also displayed. You can use option -2 only together with -b or -s.
- -i or --info
- displays basic information such as device node, device bus-ID, device type, or geometry data.
- -x or --extended
- displays the information that is obtained by using the -i option, but also open count, subchannel identifier, and so on.
- -j or --volser
- prints volume serial number (volume identifier).
- -l or --label
- displays the volume label.
- -c or --characteristics
- displays model-dependent device characteristics, for example disk encryption status or whether the disk is a solid-state device.
- -t <spec> or --vtoc=<spec>
- displays the VTOC's table-of-contents, or a single VTOC entry,
on the console. The variable <spec> can take
these values:
- info
- displays overview information about the VTOC, such as a list of the data set names and their sizes.
- f1
- displays the contents of all format 1 data set control blocks (DSCBs).
- f3
- displays the contents of all (z/OS®-specific) format 3 DSCBs.
- f4
- displays the contents of all format 4 DSCBs.
- f5
- displays the contents of all format 5 DSCBs.
- f7
- displays the contents of all format 7 DSCBs.
- f8
- displays the contents of all format 8 DSCBs.
- f9
- displays the contents of all format 9 DSCBs.
- all
- displays the contents of all DSCBs.
- <node>
- specifies the device node of the device for which you want to display information, for example, /dev/dasdzzz.
- -v or --version
- displays version number on console, and exit.
- -h or --help
- displays short usage text on console. To view the man page, enter man dasdview.
Examples
- To display basic information about a DASD:
This example displays:# dasdview -i /dev/dasdzzz--- general DASD information -------------------------------------------------- device node : /dev/dasdzzz busid : 0.0.0193 type : ECKD device type : hex 3390 dec 13200 --- DASD geometry ------------------------------------------------------------- number of cylinders : hex 64 dec 100 tracks per cylinder : hex f dec 15 blocks per track : hex c dec 12 blocksize : hex 1000 dec 4096 # - To display device
characteristics:
This example displays:# dasdview -c /dev/dasdaencrypted disk : no - To include extended information:
This example displays:# dasdview -x /dev/dasdzzz--- general DASD information -------------------------------------------------- device node : /dev/dasdzzz busid : 0.0.0193 type : ECKD device type : hex 3390 dec 13200 --- DASD geometry ------------------------------------------------------------- number of cylinders : hex 64 dec 100 tracks per cylinder : hex f dec 15 blocks per track : hex c dec 12 blocksize : hex 1000 dec 4096 --- extended DASD information ------------------------------------------------- real device number : hex 452bc08 dec 72530952 subchannel identifier : hex e dec 14 CU type (SenseID) : hex 3990 dec 14736 CU model (SenseID) : hex e9 dec 233 device type (SenseID) : hex 3390 dec 13200 device model (SenseID) : hex a dec 10 open count : hex 1 dec 1 req_queue_len : hex 0 dec 0 chanq_len : hex 0 dec 0 status : hex 5 dec 5 label_block : hex 2 dec 2 FBA_layout : hex 0 dec 0 characteristics_size : hex 40 dec 64 confdata_size : hex 100 dec 256 characteristics : 3990e933 900a5f80 dff72024 0064000f e000e5a2 05940222 13090674 00000000 00000000 00000000 24241502 dfee0001 0677080f 007f4a00 1b350000 00000000 configuration_data : dc010100 4040f2f1 f0f54040 40c9c2d4 f1f3f0f0 f0f0f0f0 f0c6c3f1 f1f30509 dc000000 4040f2f1 f0f54040 40c9c2d4 f1f3f0f0 f0f0f0f0 f0c6c3f1 f1f30500 d4020000 4040f2f1 f0f5c5f2 f0c9c2d4 f1f3f0f0 f0f0f0f0 f0c6c3f1 f1f3050a f0000001 4040f2f1 f0f54040 40c9c2d4 f1f3f0f0 f0f0f0f0 f0c6c3f1 f1f30500 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 800000a1 00001e00 51400009 0909a188 0140c009 7cb7efb7 00000000 00000800 # - To display volume label information:
This example displays:# dasdview -l /dev/dasdzzz--- volume label -------------------------------------------------------------- volume label key : ascii 'åÖÖñ' : ebcdic 'VOL1' : hex e5d6d3f1 volume label identifier : ascii 'åÖÖñ' : ebcdic 'VOL1' : hex e5d6d3f1 volume identifier : ascii 'ðçðñùó' : ebcdic '0X0193' : hex f0e7f0f1f9f3 security byte : hex 40 VTOC pointer : hex 0000000101 (cyl 0, trk 1, blk 1) reserved : ascii '@@@@@' : ebcdic ' ' : hex 4040404040 CI size for FBA : ascii '@@@@' : ebcdic ' ' : hex 40404040 blocks per CI (FBA) : ascii '@@@@' : ebcdic ' ' : hex 40404040 labels per CI (FBA) : ascii '@@@@' : ebcdic ' ' : hex 40404040 reserved : ascii '@@@@' : ebcdic ' ' : hex 40404040 owner code for VTOC : ascii '@@@@@@@@@@@@@@' ebcdic ' ' hex 40404040 40404040 40404040 4040 reserved : ascii '@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@' ebcdic ' ' hex 40404040 40404040 40404040 40404040 40404040 40404040 40404040 40 # - To display partition information:
This example displays:# dasdview -t info /dev/dasdzzz--- VTOC info ----------------------------------------------------------------- The VTOC contains: 3 format 1 label(s) 1 format 4 label(s) 1 format 5 label(s) 0 format 7 label(s) 0 format 8 label(s) 0 format 9 label(s) Other S/390 and zSeries operating systems would see the following data sets: +----------------------------------------------+--------------+--------------+ | data set | start | end | +----------------------------------------------+--------------+--------------+ | LINUX.V0X0193.PART0001.NATIVE | trk | trk | | data set serial number : '0X0193' | 2 | 500 | | system code : 'IBM LINUX ' | cyl/trk | cyl/trk | | creation date : year 2001, day 317 | 0/ 2 | 33/ 5 | +----------------------------------------------+--------------+--------------+ | LINUX.V0X0193.PART0002.NATIVE | trk | trk | | data set serial number : '0X0193' | 501 | 900 | | system code : 'IBM LINUX ' | cyl/trk | cyl/trk | | creation date : year 2001, day 317 | 33/ 6 | 60/ 0 | +----------------------------------------------+--------------+--------------+ | LINUX.V0X0193.PART0003.NATIVE | trk | trk | | data set serial number : '0X0193' | 901 | 1499 | | system code : 'IBM LINUX ' | cyl/trk | cyl/trk | | creation date : year 2001, day 317 | 60/ 1 | 99/ 14 | +----------------------------------------------+--------------+--------------+ # - To display VTOC information:
This example displays:# dasdview -t f4 /dev/dasdzzz--- VTOC format 4 label ------------------------------------------------------- DS4KEYCD : 040404040404040404040404040404040404040404040404040404040404040404... DS4IDFMT : dec 244, hex f4 DS4HPCHR : 0000000105 (cyl 0, trk 1, blk 5) DS4DSREC : dec 7, hex 0007 DS4HCCHH : 00000000 (cyl 0, trk 0) DS4NOATK : dec 0, hex 0000 DS4VTOCI : dec 0, hex 00 DS4NOEXT : dec 1, hex 01 DS4SMSFG : dec 0, hex 00 DS4DEVAC : dec 0, hex 00 DS4DSCYL : dec 100, hex 0064 DS4DSTRK : dec 15, hex 000f DS4DEVTK : dec 58786, hex e5a2 DS4DEVI : dec 0, hex 00 DS4DEVL : dec 0, hex 00 DS4DEVK : dec 0, hex 00 DS4DEVFG : dec 48, hex 30 DS4DEVTL : dec 0, hex 0000 DS4DEVDT : dec 12, hex 0c DS4DEVDB : dec 0, hex 00 DS4AMTIM : hex 0000000000000000 DS4AMCAT : hex 000000 DS4R2TIM : hex 0000000000000000 res1 : hex 0000000000 DS4F6PTR : hex 0000000000 DS4VTOCE : hex 01000000000100000001 typeind : dec 1, hex 01 seqno : dec 0, hex 00 llimit : hex 00000001 (cyl 0, trk 1) ulimit : hex 00000001 (cyl 0, trk 1) res2 : hex 00000000000000000000 DS4EFLVL : dec 0, hex 00 DS4EFPTR : hex 0000000000 (cyl 0, trk 0, blk 0) res3 : hex 000000000000000000 # - To print the contents of a disk to the console starting at block
2 (volume label):
This example displays:# dasdview -b 2b -s 128 /dev/dasdzzz+----------------------------------------+------------------+------------------+ | HEXADECIMAL | EBCDIC | ASCII | | 01....04 05....08 09....12 13....16 | 1.............16 | 1.............16 | +----------------------------------------+------------------+------------------+ | E5D6D3F1 E5D6D3F1 F0E7F0F1 F9F34000 | VOL1VOL10X0193?. | ??????????????@. | | 00000101 40404040 40404040 40404040 | ................ | ................ | | 40404040 40404040 40404040 40404040 | ???????????????? | @@@@@@@@@@@@@@@@ | | 40404040 40404040 40404040 40404040 | ???????????????? | @@@@@@@@@@@@@@@@ | | 40404040 40404040 40404040 40404040 | ???????????????? | @@@@@@@@@@@@@@@@ | | 40404040 88001000 10000000 00808000 | ????h........... | @@@@?........... | | 00000000 00000000 00010000 00000200 | ................ | ................ | | 21000500 00000000 00000000 00000000 | ?............... | !............... | +----------------------------------------+------------------+------------------+ # - To display the contents of a disk on the console starting at
block 14 (first FMT1 DSCB) with format 2:
This example displays:# dasdview -b 14b -s 128 -2 /dev/dasdzzz+---------------+---------------+----------------------+----------+----------+ | BYTE | BYTE | HEXADECIMAL | EBCDIC | ASCII | | DECIMAL | HEXADECIMAL | 1 2 3 4 5 6 7 8 | 12345678 | 12345678 | +---------------+---------------+----------------------+----------+----------+ | 57344 | E000 | D3C9D5E4 E74BE5F0 | LINUX.V0 | ?????K?? | | 57352 | E008 | E7F0F1F9 F34BD7C1 | X0193.PA | ?????K?? | | 57360 | E010 | D9E3F0F0 F0F14BD5 | RT0001.N | ??????K? | | 57368 | E018 | C1E3C9E5 C5404040 | ATIVE??? | ?????@@@ | | 57376 | E020 | 40404040 40404040 | ???????? | @@@@@@@@ | | 57384 | E028 | 40404040 F1F0E7F0 | ????10X0 | @@@@???? | | 57392 | E030 | F1F9F300 0165013D | 193.???? | ???.?e?= | | 57400 | E038 | 63016D01 0000C9C2 | ??_?..IB | c?m?..?? | | 57408 | E040 | D440D3C9 D5E4E740 | M?LINUX? | ?@?????@ | | 57416 | E048 | 40404065 013D0000 | ??????.. | @@@e?=.. | | 57424 | E050 | 00000000 88001000 | ....h.?. | ....?.?. | | 57432 | E058 | 10000000 00808000 | ?....??. | ?....??. | | 57440 | E060 | 00000000 00000000 | ........ | ........ | | 57448 | E068 | 00010000 00000200 | .?....?. | .?....?. | | 57456 | E070 | 21000500 00000000 | ?.?..... | !.?..... | | 57464 | E078 | 00000000 00000000 | ........ | ........ | +---------------+---------------+----------------------+----------+----------+ # - To see what is at block 1234 (in this example there is nothing
there):
This example displays:# dasdview -b 1234b -s 128 /dev/dasdzzz+----------------------------------------+------------------+------------------+ | HEXADECIMAL | EBCDIC | ASCII | | 01....04 05....08 09....12 13....16 | 1.............16 | 1.............16 | +----------------------------------------+------------------+------------------+ | 00000000 00000000 00000000 00000000 | ................ | ................ | | 00000000 00000000 00000000 00000000 | ................ | ................ | | 00000000 00000000 00000000 00000000 | ................ | ................ | | 00000000 00000000 00000000 00000000 | ................ | ................ | | 00000000 00000000 00000000 00000000 | ................ | ................ | | 00000000 00000000 00000000 00000000 | ................ | ................ | | 00000000 00000000 00000000 00000000 | ................ | ................ | | 00000000 00000000 00000000 00000000 | ................ | ................ | +----------------------------------------+------------------+------------------+ # - To try byte 0 instead:
This example displays:# dasdview -b 0 -s 64 /dev/dasdzzz+----------------------------------------+------------------+------------------+ | HEXADECIMAL | EBCDIC | ASCII | | 01....04 05....08 09....12 13....16 | 1.............16 | 1.............16 | +----------------------------------------+------------------+------------------+ | C9D7D3F1 000A0000 0000000F 03000000 | IPL1............ | ????............ | | 00000001 00000000 00000000 40404040 | ................ | ................ | | 40404040 40404040 40404040 40404040 | ???????????????? | @@@@@@@@@@@@@@@@ | | 40404040 40404040 40404040 40404040 | ???????????????? | @@@@@@@@@@@@@@@@ | +----------------------------------------+------------------+------------------+ # - To display the contents of a disk on the console
starting at cylinder 2 and printing one track of data:
This example displays:# dasdview -b 2c -s 1t /dev/dasdk+----------------------------------------+------------------+------------------+ | HEXADECIMAL | EBCDIC | ASCII | | 01....04 05....08 09....12 13....16 | 1.............16 | 1.............16 | +----------------------------------------+------------------+------------------+ | 52B7DBEE D6B9530B 0179F420 CB6EA95E | ????O?????4??>z; | R?????S??y???n?^ | | EF49C03C 513542E7 D8F17D9D 06DC44F7 | ??{????XQ1'????7 | ?I?<Q5B???}???D? | ... | 92963D5B 0200B0FA 53745C12 C3B45125 | ko?$?........... | ??=[?........... | | 0D6040C2 F933381E 7A4C4797 F40FEDAB | ?-?B9???:<?p4??? | ??@??38?zLG????? | ... - To display the full record information of the same
disk when it in raw-track access mode:
This example displays:# dasdview -b 2c -s 1t /dev/dasdkcylinder 2, head 0, record 0 +------------------------------------------------------------------------------+ | count area: | | hex: 0002000000000008 | | cylinder: 2 | | head: 0 | | record: 0 | | key length: 0 | | data length: 8 | +------------------------------------------------------------------------------+ | key area: | | HEXADECIMAL | EBCDIC | ASCII | | 01....04 05....08 09....12 13....16 | 1.............16 | 1.............16 | +----------------------------------------+------------------+------------------+ +----------------------------------------+------------------+------------------+ | data area: | | HEXADECIMAL | EBCDIC | ASCII | | 01....04 05....08 09....12 13....16 | 1.............16 | 1.............16 | +----------------------------------------+------------------+------------------+ | 00000000 00000000 | ................ | ................ | +----------------------------------------+------------------+------------------+ cylinder 2, head 0, record 1 +------------------------------------------------------------------------------+ | count area: | | hex: 0002000001000200 | | cylinder: 2 | | head: 0 | | record: 1 | | key length: 0 | | data length: 512 | +------------------------------------------------------------------------------+ | key area: | | HEXADECIMAL | EBCDIC | ASCII | | 01....04 05....08 09....12 13....16 | 1.............16 | 1.............16 | +----------------------------------------+------------------+------------------+ +----------------------------------------+------------------+------------------+ | data area: | | HEXADECIMAL | EBCDIC | ASCII | | 01....04 05....08 09....12 13....16 | 1.............16 | 1.............16 | +----------------------------------------+------------------+------------------+ | 52B7DBEE D6B9530B 0179F420 CB6EA95E | ????O?????4??>z; | R?????S??y???n?^ | | EF49C03C 513542E7 D8F17D9D 06DC44F7 | ??{????XQ1'????7 | ?I?<Q5B???}???D? | ... +----------------------------------------+------------------+------------------+ cylinder 2, head 0, record 2 +------------------------------------------------------------------------------+ | count area: | | hex: 0002000002000200 | | cylinder: 2 | | head: 0 | | record: 2 | | key length: 0 | | data length: 512 | +------------------------------------------------------------------------------+ | key area: | | HEXADECIMAL | EBCDIC | ASCII | | 01....04 05....08 09....12 13....16 | 1.............16 | 1.............16 | +----------------------------------------+------------------+------------------+ +----------------------------------------+------------------+------------------+ | data area: | | HEXADECIMAL | EBCDIC | ASCII | | 01....04 05....08 09....12 13....16 | 1.............16 | 1.............16 | +----------------------------------------+------------------+------------------+ | 92963D5B 0200B0FA 53745C12 C3B45125 | ko?$?.^???*?C??? | ??=[?.??St\???Q% | | 0D6040C2 F933381E 7A4C4797 F40FEDAB | ?-?B9???:<?p4??? | ??@??38?zLG????? | ... - To display the contents of a disk, which is in raw-access
mode, printing one track of data from the start of the disk:
This example displays:# dasdview -s 1t /dev/dasdkcylinder 0, head 0, record 0 +------------------------------------------------------------------------------+ | count area: | | hex: 0000000000000008 | | cylinder: 0 | | head: 0 | | record: 0 | | key length: 0 | | data length: 8 | +------------------------------------------------------------------------------+ | key area: | | HEXADECIMAL | EBCDIC | ASCII | | 01....04 05....08 09....12 13....16 | 1.............16 | 1.............16 | +----------------------------------------+------------------+------------------+ +----------------------------------------+------------------+------------------+ | data area: | | HEXADECIMAL | EBCDIC | ASCII | | 01....04 05....08 09....12 13....16 | 1.............16 | 1.............16 | +----------------------------------------+------------------+------------------+ | 00000000 00000000 | ................ | ................ | +----------------------------------------+------------------+------------------+ cylinder 0, head 0, record 1 +------------------------------------------------------------------------------+ | count area: | | hex: 0000000001040018 | | cylinder: 0 | | head: 0 | | record: 1 | | key length: 4 | | data length: 24 | +------------------------------------------------------------------------------+ | key area: | | HEXADECIMAL | EBCDIC | ASCII | | 01....04 05....08 09....12 13....16 | 1.............16 | 1.............16 | +----------------------------------------+------------------+------------------+ | C9D7D3F1 | IPL1............ | ????............ | +----------------------------------------+------------------+------------------+ | data area: | | HEXADECIMAL | EBCDIC | ASCII | | 01....04 05....08 09....12 13....16 | 1.............16 | 1.............16 | +----------------------------------------+------------------+------------------+ | 000A0000 0000000F 03000000 00000001 | .?.....??......? | .?.....??......? | | 00000000 00000000 | ................ | ................ | +----------------------------------------+------------------+------------------+ ...