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BSD 2.11 - man page for si (bsd section 4)

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SI(4)											    SI(4)

NAME
       si - SI 9500/CDC 9766 moving head disk

SYNOPSIS
       /sys/conf/SYSTEM:
	    NSI  si_drives # SI 9500 driver for CDC 9766 disks

       /etc/dtab:
	    #Name Unit# Addr   Vector Br Handler(s)	 # Comments
	    si	  ?	176700 170    5  siintr 	 # si9500

       major device number(s):
	    raw: 18
	    block: 9
       minor device encoding:
	    bits 0007 specify partition of SI drive
	    bits 0070 specify SI drive

DESCRIPTION
       Files  with  minor  device numbers 0 through 7 refer to various portions of drive 0; minor
       devices 8 through 15 refer to drive 1, etc.  The standard device names begin  with  ``si''
       followed  by  the drive number and then a letter a-h for partitions 0-7 respectively.  The
       character ? stands here for a drive number in the range 0-7.

       The block files access the disk via the system's normal buffering  mechanism  and  may  be
       read and written without regard to physical disk records.  There is also a `raw' interface
       which provides for direct transmission between the disk and the user's read or write  buf-
       fer.   A  single read or write call results in exactly one I/O operation and therefore raw
       I/O is considerably more efficient when many words are transmitted.  The names of the  raw
       files conventionally begin with an extra `r.'

       In  raw I/O the buffer must begin on a word (even) boundary, and counts should be a multi-
       ple of 512 bytes (a disk sector).  Likewise seek calls should specify a	multiple  of  512
       bytes.

DISK SUPPORT
       The origin and size (in sectors) of the pseudo-disks on each drive are as follows:

       SI 9500/CDC9766 partitions:
	    disk   start  length       cyls  comments
	    xp?a       0    9120    0 -  14  /
	    xp?b    9120    9120   15 -  29  swap
	    xp?c   18240  234080   30 - 414
	    xp?d  252320  247906  415 - 822*
	    xp?e   18240  164160   30 - 299  /usr
	    xp?f  182400  152000  300 - 549
	    xp?g  334400  165826  550 - 822*
	    xp?h       0  500384    0 - 822  whole pack

       Those partitions marked with an asterisk (``*'') actually stop short of the indicated end-
       ing cylinder to protect any bad block forwarding information on the packs.  The	indicated
       lengths	are  correct.	Partition  ``h''  must be used to access the bad block forwarding
       area.  N.B.: the si driver does not support bad block forwarding; the space is reserved in
       the event bad block forwarding is ever added to the driver.

FILES
       /dev/si[0-7][a-h]   block files
       /dev/rsi[0-7][a-h]  raw files
       /dev/MAKEDEV	   script to create special files
       /dev/MAKEDEV.local  script to localize special files

SEE ALSO
       hk(4), ra(4), ram(4), rk(4), rl(4), rp(4), rx(4), xp(4), dtab(5), autoconfig(8)

DIAGNOSTICS
       si%d%c: hard error sn%d cnr=%b err=%b.  An unrecoverable error occurred during transfer of
       the specified sector of the specified disk partition.  The contents of the two error  reg-
       isters are also printed in octal and symbolically with bits decoded.  The error was either
       unrecoverable, or a large number of retry attempts (including offset positioning and drive
       recalibration) could not recover the error.

       si%d%c: hard error sn%d ssr=%b err=%b.  An unrecoverable error occurred during transfer of
       the specified sector of the specified disk partition.  The contents of the two error  reg-
       isters are also printed in octal and symbolically with bits decoded.  The error was either
       unrecoverable, or a large number of retry attempts (including offset positioning and drive
       recalibration) could not recover the error.

BUGS
       In raw I/O read and write(2) truncate file offsets to 512-byte block boundaries, and write
       scribbles on the tail of incomplete blocks.  Thus, in programs that are likely  to  access
       raw devices, read, write and lseek(2) should always deal in 512-byte multiples.

       The  partition  tables  for  the file systems should be read off of each pack, as they are
       never quite what any single installation would prefer, and this would make packs more por-
       table.

3rd Berkeley Distribution		 August 20, 1987				    SI(4)
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