Ordinary Harddisks on the AS/400 - Revision history

PoC: /* Weblinks */ Link

2025-01-07T17:48:01Z

Weblinks: Link

← Older revision		Revision as of 19:48, 7 January 2025
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	** [http://www.peripheral-vision.com/products/scsi-to-compact-flash/ SCSICFDISK - SCSI to Compact Flash Disk] from Peripheral Vision		** [http://www.peripheral-vision.com/products/scsi-to-compact-flash/ SCSICFDISK - SCSI to Compact Flash Disk] from Peripheral Vision
	* [http://friedkiwi.github.io/scsi2sd/ SCSI2SD/400]		* [http://friedkiwi.github.io/scsi2sd/ SCSI2SD/400]
	* [http://qseco.fr/research/demystifying-as400-dasd/ Demystifying AS/400 DASD]		* [https://web.archive.org/web/20220730063336/http://qseco.fr/research/demystifying-as400-dasd/ Demystifying AS/400 DASD], on archive.org<ref>Original server is down.</ref>
	* [http://ps-2.kev009.com/rs6000/manuals/SAN/ESS/2105_Model_ExxFxx/ESS_SCSI_Command_Reference_ExxFxx_SC26-7297-01.PDF IBM SCSI Command Reference,] 2105 Models E10, E20, F10, and F20		* [http://ps-2.kev009.com/rs6000/manuals/SAN/ESS/2105_Model_ExxFxx/ESS_SCSI_Command_Reference_ExxFxx_SC26-7297-01.PDF IBM SCSI Command Reference,] 2105 Models E10, E20, F10, and F20

PoC: /* Alternative Solutions */ +Link

2023-08-05T14:11:56Z

Alternative Solutions: +Link

← Older revision		Revision as of 16:11, 5 August 2023
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	The adapter also provides emulation of a tape drive. This works like a charm.		The adapter also provides emulation of a tape drive. This works like a charm.

			== See also ==
			* [[Copying disks with Linux]]

	== Weblinks ==		== Weblinks ==

Mlc: /* AS/400-Disk in a Linux box */

2023-02-11T21:29:38Z

AS/400-Disk in a Linux box

← Older revision		Revision as of 23:29, 11 February 2023
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	Ordinary SCSI-Disks cannot be used with the AS/400. They don’t even show up in DST<ref>Roughly what’s known on PC platforms as ''BIOS''.</ref>.		Ordinary SCSI-Disks cannot be used with the AS/400. They don’t even show up in DST<ref>Roughly what’s known on PC platforms as ''BIOS''.</ref>.

	== AS/400~~-Disk~~ in a Linux box ==		== AS/400 disk in a Linux box ==
	This is a shortened sample output from a Linux box’ kernel log:		This is a shortened sample output from a Linux box’ kernel log:
	scsi 5:0:3:0: Direct-Access IBMAS400 DFHSS4W 5959 PQ: 0 ANSI: 2		scsi 5:0:3:0: Direct-Access IBMAS400 DFHSS4W 5959 PQ: 0 ANSI: 2

Mlc: /* AS/400-Disk in a Linux box */

2023-02-11T21:29:29Z

AS/400-Disk in a Linux box

← Older revision		Revision as of 23:29, 11 February 2023
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	== AS/400-Disk in a Linux box ==		== AS/400-Disk in a Linux box ==
	This is a shortened sample output from a ~~linux~~ box’ kernel log:		This is a shortened sample output from a Linux box’ kernel log:
	scsi 5:0:3:0: Direct-Access IBMAS400 DFHSS4W 5959 PQ: 0 ANSI: 2		scsi 5:0:3:0: Direct-Access IBMAS400 DFHSS4W 5959 PQ: 0 ANSI: 2
	scsi5:A:3:0: Tagged Queuing enabled. Depth 8		scsi5:A:3:0: Tagged Queuing enabled. Depth 8

Mlc at 21:26, 11 February 2023

2023-02-11T21:26:27Z

← Older revision		Revision as of 23:26, 11 February 2023
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	The following article is an excerpt from the [https://kb.pocnet.net/wiki/Standard-Festplatten_an_der_AS/400 PoCnet-Wiki], translated to english language.		The following article is an excerpt from the [https://kb.pocnet.net/wiki/Standard-Festplatten_an_der_AS/400 PoCnet-Wiki], translated to english language.

	Ordinary SCSI-Disks cannot be used with the AS/400. They even ~~do not~~ show up in DST<ref>Roughly ~~what's~~ known on PC platforms as ''BIOS''.</ref>.		Ordinary SCSI-Disks cannot be used with the AS/400. They don’t even show up in DST<ref>Roughly what’s known on PC platforms as ''BIOS''.</ref>.

	== AS/400-Disk in a Linux box ==		== AS/400-Disk in a Linux box ==
	This is a shortened sample output from a linux ~~box'~~ kernel log:		This is a shortened sample output from a linux box’ kernel log:
	scsi 5:0:3:0: Direct-Access IBMAS400 DFHSS4W 5959 PQ: 0 ANSI: 2		scsi 5:0:3:0: Direct-Access IBMAS400 DFHSS4W 5959 PQ: 0 ANSI: 2
	scsi5:A:3:0: Tagged Queuing enabled. Depth 8		scsi5:A:3:0: Tagged Queuing enabled. Depth 8
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	sd 5:0:3:0: [sdb] Unsupported sector size 522.		sd 5:0:3:0: [sdb] Unsupported sector size 522.

	As you can see, these disks utilize 522 ~~Bytes~~ per sector instead of 512 as the rest of the world does. There is a command line utility called [http://micha.freeshell.org/scsi/ setblocksize] by Michael Baeuerle. It provides the possibility to reformat disks (supporting changeable block sizes) with different sector sizes.		As you can see, these disks utilize 522 bytes per sector instead of 512 as the rest of the world does. There is a command line utility called [http://micha.freeshell.org/scsi/ setblocksize] by Michael Baeuerle. It provides the possibility to reformat disks (supporting changeable block sizes) with different sector sizes.

	== Ordinary ~~Harddisks~~ on the AS/400 ==		== Ordinary harddisks on the AS/400 ==
	Unfortunately, ~~it's~~ not sufficient to just reformat disks to the proper sector size. It may even happen that disks with a vendor id different from ''IBM'' ~~won't~~ show up in DST regardless of the sector size.		Unfortunately, it’s not sufficient to just reformat disks to the proper sector size. It may even happen that disks with a vendor ID different from ''IBM'' won’t show up in DST regardless of the sector size.

	Newer research suggests that AS/400 approved disks have a custom IDENTITY response, additional VPD<ref>Vital Product Data.</ref> tables, and two additional, vendor defined SCSI commands: SKIP READ and SKIP WRITE. It is not clear which combination of the differences are mandatory for getting a disk to run on an AS/400.		Newer research suggests that AS/400 approved disks have a custom IDENTITY response, additional VPD<ref>Vital Product Data.</ref> tables, and two additional, vendor defined SCSI commands: SKIP READ and SKIP WRITE. It is not clear which combination of the differences are mandatory for getting a disk to run on an AS/400.

	I tried to get an IBM DCHS 9 GB 3.5"~~-Disk~~ to work on a 9401-150~~. Without~~ success. The disk shows up in DST and when trying to start a surface test, the following error message appears:		I tried to get an IBM DCHS 9 GB 3.5" disk to work on a 9401-150, without success. The disk shows up in DST and when trying to start a surface test, the following error message appears:
	Error Report		Error Report

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	== Background Information ==		== Background Information ==
	Disks for AS/400 systems come in two flavours, 520 ~~Bytes~~ and 522 ~~Bytes~~ per ~~Sector~~. The 520~~-Bytes-Format~~ is considered outdated by IBM. 520 bytes formatted disks were used with old CISC machines only.<ref>Exception: AS/400 5xx models with disks attached on the internal Multi-Function I/O Processor.</ref>		Disks for AS/400 systems come in two flavours, 520 bytes and 522 bytes per sector. The 520 bytes format is considered outdated by IBM. 520 bytes formatted disks were used with old CISC machines only.<ref>Exception: AS/400 5xx models with disks attached on the internal Multi-Function I/O Processor.</ref>

	The 520~~-Bytes-Format~~ is composed of:		The 520 bytes format is composed of:
	* 8 ~~Bytes Header~~,		* 8 bytes header,
	* 512 ~~Bytes Payload.~~		* 512 bytes payload

	The 522~~-Bytes-Format~~ composed of:		The 522 bytes format composed of:
	* 8 ~~Bytes Header~~,		* 8 bytes header,
	* 512 ~~Bytes Payload~~,		* 512 bytes payload,
	* 2 ~~Bytes Trailer.~~		* 2 bytes trailer

	The 522~~-Bytes-Format~~ is mandatory for:		The 522 bytes format is mandatory for:
	* RAID,		* RAID,
	* Compression.		* Compression

	Metadata for these (and probably more) features are kept in these trailer bytes.		Metadata for these (and probably more) features are kept in these trailer bytes.

	The header consists of metadata for the ~~block's~~ payload. Example: Protection (RAID1, RAID5 or similar). Also it contains flags if the block contains valid data, an individual block address (probably needed for the famous single level storage addressing scheme), and more. Metatada is exclusively utilized by the I/O~~-Processor~~. The OS itself handles 512 ~~Bytes~~ per ~~Sector Data~~ as known from other ~~Systems~~.		The header consists of metadata for the block’s payload. Example: Protection (RAID1, RAID5 or similar). Also it contains flags if the block contains valid data, an individual block address (probably needed for the famous single level storage addressing scheme), and more. Metatada is exclusively utilized by the I/O processor. The OS itself handles 512 bytes per sector data as known from other systems.

	Header and trailer will be written while formatting a drive with the accompanying AS/400 tool (DST).		Header and trailer will be written while formatting a drive with the accompanying AS/400 tool (DST).

	== Alternative Solutions ==		== Alternative Solutions ==
	A UK based company offers an adapter board that makes it possible to use standard compact flash media instead of spinning disks. It seems that this solution has never been tested in the field. I got a product sample for testing but it fails to be recognized by the system: This adapter also works with 512 Bytes per sector and as such ~~won't~~ be recognized by the system.		A UK based company offers an adapter board that makes it possible to use standard compact flash media instead of spinning disks. It seems that this solution has never been tested in the field. I got a product sample for testing but it fails to be recognized by the system: This adapter also works with 512 Bytes per sector and as such won’t be recognized by the system.

	The adapter also provides emulation of a tape drive. This works like a charm.		The adapter also provides emulation of a tape drive. This works like a charm.

PoC: /* Weblinks */ +Link

2021-07-01T20:57:46Z

Weblinks: +Link

← Older revision		Revision as of 22:57, 1 July 2021
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	** [http://www.peripheral-vision.com/products/scsi-to-compact-flash/ SCSICFDISK - SCSI to Compact Flash Disk] from Peripheral Vision		** [http://www.peripheral-vision.com/products/scsi-to-compact-flash/ SCSICFDISK - SCSI to Compact Flash Disk] from Peripheral Vision
	* [http://friedkiwi.github.io/scsi2sd/ SCSI2SD/400]		* [http://friedkiwi.github.io/scsi2sd/ SCSI2SD/400]
			* [http://qseco.fr/research/demystifying-as400-dasd/ Demystifying AS/400 DASD]
	* [http://ps-2.kev009.com/rs6000/manuals/SAN/ESS/2105_Model_ExxFxx/ESS_SCSI_Command_Reference_ExxFxx_SC26-7297-01.PDF IBM SCSI Command Reference,] 2105 Models E10, E20, F10, and F20		* [http://ps-2.kev009.com/rs6000/manuals/SAN/ESS/2105_Model_ExxFxx/ESS_SCSI_Command_Reference_ExxFxx_SC26-7297-01.PDF IBM SCSI Command Reference,] 2105 Models E10, E20, F10, and F20

PoC: Note

2020-03-15T12:49:51Z

Note

← Older revision		Revision as of 14:49, 15 March 2020
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	The following article is an excerpt from the [https://kb.pocnet.net/wiki/Standard-Festplatten_an_der_AS/400 PoCnet-Wiki], translated to english language.		The following article is an excerpt from the [https://kb.pocnet.net/wiki/Standard-Festplatten_an_der_AS/400 PoCnet-Wiki], translated to english language.

	Ordinary SCSI-Disks cannot be used with the AS/400. They even do not show up in DST.		Ordinary SCSI-Disks cannot be used with the AS/400. They even do not show up in DST<ref>Roughly what's known on PC platforms as ''BIOS''.</ref>.

	== AS/400-Disk in a Linux box ==		== AS/400-Disk in a Linux box ==

PoC: ±Cat

2020-03-15T12:48:43Z

±Cat

← Older revision		Revision as of 14:48, 15 March 2020
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	The adapter also provides emulation of a tape drive. This works like a charm.		The adapter also provides emulation of a tape drive. This works like a charm.

	~~== Footnotes ==~~
	~~<references />~~

	== Weblinks ==		== Weblinks ==
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	* [http://ps-2.kev009.com/rs6000/manuals/SAN/ESS/2105_Model_ExxFxx/ESS_SCSI_Command_Reference_ExxFxx_SC26-7297-01.PDF IBM SCSI Command Reference,] 2105 Models E10, E20, F10, and F20		* [http://ps-2.kev009.com/rs6000/manuals/SAN/ESS/2105_Model_ExxFxx/ESS_SCSI_Command_Reference_ExxFxx_SC26-7297-01.PDF IBM SCSI Command Reference,] 2105 Models E10, E20, F10, and F20

	[[Category: ~~Basic Knowledge~~]]		== Footnotes ==
			<references />

			[[Category: Hardware Configuration Guide]]

PoC: which => that

2020-03-09T21:48:04Z

which => that

← Older revision		Revision as of 23:48, 9 March 2020
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	sd 5:0:3:0: [sdb] Unsupported sector size 522.		sd 5:0:3:0: [sdb] Unsupported sector size 522.

	As you can see, these disks utilize 522 Bytes per sector instead of 512 as the rest of the world does. There is a command line utility called [http://micha.freeshell.org/scsi/ setblocksize] by Michael Baeuerle. It provides the possibility to reformat disks (~~which support this~~) with different sector sizes.		As you can see, these disks utilize 522 Bytes per sector instead of 512 as the rest of the world does. There is a command line utility called [http://micha.freeshell.org/scsi/ setblocksize] by Michael Baeuerle. It provides the possibility to reformat disks (supporting changeable block sizes) with different sector sizes.

	== Ordinary Harddisks on the AS/400 ==		== Ordinary Harddisks on the AS/400 ==
Line 102:		Line 102:

	== Alternative Solutions ==		== Alternative Solutions ==
	A UK based company offers an adapter board ~~which~~ makes it possible to use standard compact flash media instead of spinning disks. It seems that this solution has never been tested in the field. I got a product sample for testing but it fails to be recognized by the system: This adapter also works with 512 Bytes per sector and as such won't be recognized by the system.		A UK based company offers an adapter board that makes it possible to use standard compact flash media instead of spinning disks. It seems that this solution has never been tested in the field. I got a product sample for testing but it fails to be recognized by the system: This adapter also works with 512 Bytes per sector and as such won't be recognized by the system.

	The adapter also provides emulation of a tape drive. This works like a charm.		The adapter also provides emulation of a tape drive. This works like a charm.

	== ~~Fußnoten~~ ==		== Footnotes ==
	<references />		<references />

PoC at 17:21, 31 December 2018

2018-12-31T17:21:37Z

← Older revision		Revision as of 19:21, 31 December 2018
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	* [http://friedkiwi.github.io/scsi2sd/ SCSI2SD/400]		* [http://friedkiwi.github.io/scsi2sd/ SCSI2SD/400]
	* [http://ps-2.kev009.com/rs6000/manuals/SAN/ESS/2105_Model_ExxFxx/ESS_SCSI_Command_Reference_ExxFxx_SC26-7297-01.PDF IBM SCSI Command Reference,] 2105 Models E10, E20, F10, and F20		* [http://ps-2.kev009.com/rs6000/manuals/SAN/ESS/2105_Model_ExxFxx/ESS_SCSI_Command_Reference_ExxFxx_SC26-7297-01.PDF IBM SCSI Command Reference,] 2105 Models E10, E20, F10, and F20

			[[Category: Basic Knowledge]]