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HP(4)		       BSD/vax Kernel Interfaces Manual			 HP(4)

NAME
     hp — MASSBUS disk interface

SYNOPSIS
     disk hp0 at mba0 drive 0

DESCRIPTION
     The hp driver is a generic Massbus disk driver which handles both the
     standard DEC controllers and the Emulex SC750 and SC780 controllers.  It
     is typical of a block-device disk driver; block I/O is described in
     physio(4).

     The script MAKEDEV(8) should be used to create the special files; if a
     special file needs to be created by hand consult mknod(8).	 It is recom‐
     mended as a security precaution to not create special files for devices
     which may never be installed.

     The first sector of each disk contains both a first-stage bootstrap pro‐
     gram and a disk label containing geometry information and partition lay‐
     outs (see disklabel(5).  This sector is normally write-protected, and
     disk-to-disk copies should avoid copying this sector.  The label may be
     updated with disklabel(8), which can also be used to write-enable and
     write-disable the sector.	The next 15 sectors contain a second-stage
     bootstrap program.

DISK SUPPORT
     This driver handles both standard DEC controllers and Emulex SC750 and
     SC780 controllers.	 During autoconfiguration or whenever a drive comes on
     line for the first time, or when a drive is opened after all partitions
     are closed, the first sector of the drive is examined for a disk label.
     If a label is found, the geometry of the drive and the partition tables
     are taken from it.	 If no label is found, standard DEC drive types are
     recognized according to the MASSBUS drive type register, and default par‐
     titions are used.	For the Emulex controller the drive type register
     should be configured to indicate the drive is an RM02.  When this is
     encountered, the driver checks the holding register to find out the disk
     geometry and, based on this information, decides what the drive type is.

     Special file names begin with ‘hp’ and ‘rhp’ for the block and character
     files respectively. The second component of the name, a drive unit number
     in the range of zero to seven, is represented by a ‘’?  in the disk lay‐
     outs below.  The last component is the file system partition designated
     by a letter from ‘a’ to ‘h’ and also corresponds to a minor device number
     set: zero to seven, eight to 15, 16 to 23 and so forth for drive zero,
     drive two and drive three respectively.  The following disks are sup‐
     ported: RM03, RM05, RP06, RM80, RP05, RP07, ML11A, ML11B, CDC 9775, CDC
     9730, AMPEX Capricorn (32 sectors/track), FUJITSU Eagle (48 sec‐
     tors/track), FUJITSU 2361, and AMPEX 9300.	 The default layout and size
     (in sectors) of the partitions for these drives:

     RM03 partitions
     disk      start	length	     cyls
	       hp?a	0	     15884     0-99
	       hp?b	16000	     33440     100-309
	       hp?c	0	     131680    0-822
	       hp?d	49600	     15884     309-408
	       hp?e	65440	     55936     409-758
	       hp?f	121440	     10080     759-822
	       hp?g	49600	     82080     309-822

     RM05 partitions
     disk      start	length	     cyls
	       hp?a	0	     15884     0-26
	       hp?b	16416	     33440     27-81
	       hp?c	0	     500384    0-822
	       hp?d	341696	     15884     562-588
	       hp?e	358112	     55936     589-680
	       hp?f	414048	     86176     681-822
	       hp?g	341696	     158528    562-822
	       hp?h	49856	     291346    82-561

     RP06 partitions
     disk      start	length	     cyls
	       hp?a	0	     15884     0-37
	       hp?b	15884	     33440     38-117
	       hp?c	0	     340670    0-814
	       hp?d	49324	     15884     118-155
	       hp?e	65208	     55936     156-289
	       hp?f	121220	     219296    290-814
	       hp?g	49324	     291192    118-814

     RM80 partitions
     disk      start	length	     cyls
	       hp?a	0	     15884     0-36
	       hp?b	16058	     33440     37-114
	       hp?c	0	     242606    0-558
	       hp?d	49910	     15884     115-151
	       hp?e	68096	     55936     152-280
	       hp?f	125888	     120466    281-558
	       hp?g	49910	     192510    115-558

     RP05 partitions
     disk      start	length	     cyls
	       hp?a	0	     15884     0-37
	       hp?b	15884	     33440     38-117
	       hp?c	0	     171798    0-410
	       hp?d	2242	     15884     118-155
	       hp?e	65208	     55936     156-289
	       hp?f	121220	     50424     290-410
	       hp?g	2242	     122320    118-410

     RP07 partitions
     disk      start	length	     cyls
	       hp?a	0	     15884     0-9
	       hp?b	16000	     66880     10-51
	       hp?c	0	     1008000   0-629
	       hp?d	376000	     15884     235-244
	       hp?e	392000	     307200    245-436
	       hp?f	699200	     308600    437-629
	       hp?g	376000	     631800    235-629
	       hp?h	83200	     291346    52-234

     CDC 9775 partitions
     disk      start	length	     cyls
	       hp?a	0	     15884     0-12
	       hp?b	16640	     66880     13-65
	       hp?c	0	     1077760   0-841
	       hp?d	376320	     15884     294-306
	       hp?e	392960	     307200    307-546
	       hp?f	700160	     377440    547-841
	       hp?g	376320	     701280    294-841
	       hp?h	84480	     291346    66-293

     CDC 9730 partitions
     disk      start	length	     cyls
	       hp?a	0	     15884     0-49
	       hp?b	16000	     33440     50-154
	       hp?c	0	     263360    0-822
	       hp?d	49600	     15884     155-204
	       hp?e	65600	     55936     205-379
	       hp?f	121600	     141600    380-822
	       hp?g	49600	     213600    155-822

     AMPEX Capricorn partitions
     disk      start	length	     cyls
	       hp?a	0	     15884     0-31
	       hp?b	16384	     33440     32-97
	       hp?c	0	     524288    0-1023
	       hp?d	342016	     15884     668-699
	       hp?e	358400	     55936     700-809
	       hp?f	414720	     109408    810-1023
	       hp?g	342016	     182112    668-1023
	       hp?h	50176	     291346    98-667

     FUJITSU Eagle partitions
     disk      start	length	     cyls
	       hp?a	0	     15884     0-16
	       hp?b	16320	     66880     17-86
	       hp?c	0	     808320    0-841
	       hp?d	375360	     15884     391-407
	       hp?e	391680	     55936     408-727
	       hp?f	698880	     109248    728-841
	       hp?g	375360	     432768    391-841
	       hp?h	83520	     291346    87-390

     FUJITSU 2361 partitions
     disk      start	length	     cyls
	       hp?a	0	     15884     0-12
	       hp?b	16640	     66880     13-65
	       hp?c	0	     1077760   0-841
	       hp?d	376320	     15884     294-306
	       hp?e	392960	     307200    307-546
	       hp?f	700160	     377408    547-841
	       hp?g	363520	     701248    294-841
	       hp?h	84480	     291346    66-293

     AMPEX 9300 partitions
     disk      start	length	     cyl
	       hp?a	0	     15884     0-26
	       hp?b	16416	     33440     27-81
	       hp?c	0	     495520    0-814
	       hp?d	341696	     15884     562-588
	       hp?e	358112	     55936     589-680
	       hp?f	414048	     81312     681-814
	       hp?g	341696	     153664    562-814
	       hp?h	49856	     291346    82-561

     The hp?a partition is normally used for the root file system, the hp?b
     partition as a paging area, and the hp?c partition for pack-pack copying
     (it maps the entire disk).	 On disks larger than about 205 Megabytes, the
     hp?h partition is inserted prior to the hp?d or hp?g partition; the hp?g
     partition then maps the remainder of the pack.  All disk partition tables
     are calculated using the diskpart(8) program.

FILES
     /dev/hp[0-7][a-h]	 block files
     /dev/rhp[0-7][a-h]	 raw files

DIAGNOSTICS
     hp%d%c: hard error %sing fsbn %d [of %d-%d] (hp%d bn %d cn %d tn %d sn
     %d) mbsr=%b er1=%b er2=%b.	 An unrecoverable error occurred during trans‐
     fer of the specified filesystem block number, which is a logical block
     number on the indicated partition.	 If the transfer involved multiple
     blocks, the block range is printed as well.  The parenthesized fields
     list the actual disk sector number relative to the beginning of the
     drive, as well as the cylinder, track and sector number of the block.
     The MASSBUS status register is printed in hexadecimal and with the error
     bits decoded if any error bits other than MBEXC and DTABT are set.	 In
     any case the contents of the two error registers are also printed in
     octal and symbolically with bits decoded.	(Note that er2 is what old
     RP06 manuals would call RPER3; the terminology is that of the RM disks).
     The error was either unrecoverable, or a large number of retry attempts
     (including offset positioning and drive recalibration) could not recover
     the error.

     hp%d: write locked.  The write protect switch was set on the drive when a
     write was attempted.  The write operation is not recoverable.

     hp%d: not ready .	The drive was spun down or off line when it was
     accessed.	The I/O operation is not recoverable.

     hp%d%c: soft ecc reading fsbn %d [of %d-%d] (hp%d bn %d cn %d tn %d sn
     %d).  A recoverable ECC error occurred on the specified sector of the
     specified disk partition.	If the transfer involved multiple blocks, the
     block range is printed as well.  The parenthesized fields list the actual
     disk sector number relative to the beginning of the drive, as well as the
     cylinder, track and sector number of the block.  This happens normally a
     few times a week.	If it happens more frequently than this the sectors
     where the errors are occurring should be checked to see if certain cylin‐
     ders on the pack, spots on the carriage of the drive or heads are indi‐
     cated.

     hp%d: 9775 (direct).
     hp%d: 9730 (direct).
     hp%d: 9300.
     hp%d: 9762.
     hp%d: capricorn.
     hp%d: eagle.
     hp%d: 2361.
     hp%d: ntracks %d, nsectors %d: unknown device.  During autoconfiguration
     one of the above messages may appear on the console indicating the appro‐
     priate drive type was recognized.	The last message indicates the drive
     is of a unknown type.  In this case, the correct geometry is set, and one
     partition is created that contains the entire drive.

SEE ALSO
     physio(4), up(4), disklabel(5), MAKEDEV(8) disklabel(8) mknod(8)

HISTORY
     The hp driver appeared in 4.0BSD.

BUGS
     DEC-standard error logging should be supported.

     A program to analyze the logged error information (even in its present
     reduced form) is needed.

4th Berkeley Distribution	 June 5, 1993	     4th Berkeley Distribution
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