disk man page on DigitalUNIX

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rz(7)									 rz(7)

NAME
       disk, dsk, cdrom, rz - SCSI disk interface

SYNOPSIS
       For  each  specific  system,  this information is located in the system
       configuration file in /sys/conf/<SYSTEM> and in /sys/conf/GENERIC

       AlphaServer 8200 and AlphaServer 8400 Qlogic ISP1020:

       bus tlsb0 at nexus?  bus tiop0 at tlsb0 vector tioperror	 config_driver
       isp

       AlphaServer 8200 and AlphaServer 8400 DEC KZMSA:

       bus  tlsb0  at  nexus?  bus tiop0 at tlsb0 vector tioperror bus xmi0 at
       tiop? vector xmierror config_driver   xza

       DEC 7000/10000 DEC KZMSA:

       bus lsb0 at nexus?  bus iop0 at lsb0 vector ioperror bus xmi0  at  iop0
       vector xmierror config_driver xza

       DEC 4000 DEC SIOP:

       bus ibus0 at nexus?  bus lbus0 at ibus0 config_driver siop

       DEC 3000 NCR ASC:

       bus tc0 at nexus?  config_driver tcds

       DEC 3000 DEC KZTSA:

       bus tc0 at nexus?  config_driver tza

       DEC PCI bus DEC KZPSA:

       bus pci0 at * config_driver pza

       DEC PCI bus NCR 810:

       bus pci0 at * config_driver psiop

       DEC PCI bus Qlogic ISP1020:

       bus pci0 at * config_driver isp

       DEC EISA bus Adeptec 1740:

       bus eisa0 at * config_driver aha

DESCRIPTION
       The rz driver is for all HP Small Computer System Interface (SCSI) disk
       drives.

       There is one major number used to represent SCSI disks, pointing to the
       driver. The minor number (for scsi) is the SCSI driver's logical ID (or
       LID).  Information for individual disks can be obtained using the hwmgr
       utility.

       The  minor  number  is  used to represent both the SCSI unit number and
       partition.  A disk partition refers to  a  designated  portion  of  the
       physical disk. To accomplish this, the 20-bit minor number is broken up
       into two parts.	The low six bits of the minor number  specify  a  disk
       partition.   The	 partitions  use a letter, a through h, as their name.
       The next 14 bits of the minor  number  specify  the  SCSI  unit	number
       within a group of disks.

       The  device  special file names associated with SCSI disks are based on
       conventions that are closely associated with the minor number  assigned
       to the disk. The standard device names begin with /dev/disk/dsk for the
       block special file and /dev/rdisk/dsk for the raw  (character)  special
       file. Following the dsk is the logical device number (decimal) and then
       a letter, a through h, that represents the partition.  Throughout  this
       reference  page, the question mark (?) character represents the logical
       device number in the name of the device	special	 file.	 For  example,
       dsk?b could represent dsk0b, or dsk1b.

       A  disk	can  be	 accessed through either the block special file or the
       character special file.	The block special file accesses the disk using
       the  file system's normal buffering mechanism.  Reads and writes to the
       block special file can specify any size.	 This avoids the need to limit
       data  transfers	to  the size of physical disk records and to calculate
       offsets within disk records.  The file system can break up  large  read
       and write requests into smaller fixed-size transfers to the disk.

       The  character  special	file  provides a raw interface that allows for
       direct transmission between the disk and the user's read or write  buf‐
       fer.   A	 single	 read or write to the raw interface results in exactly
       one I/O operation.  Consequently, raw  I/O  may	be  considerably  more
       efficient for large transfers.

       For  systems  with SCSI disks, the first software boot after the system
       is powered on may take longer than expected.  This delay is normal  and
       is caused by the software spinning up the SCSI disk drives.

   Disk Support
       This  driver  handles all disk drives that can be connected to the SCSI
       bus. Consult the Software Product Description (SPD) to determine	 which
       drives are supported for which CPU types and hardware configurations.

       SCSI  RAID  Controllers	are  viewed  in most cases as SCSI-type disks.
       There are some differences that should be taken into consideration when
       configuring  a  RAID  device: Currently, only sector sizes of 512 bytes
       are supported.  Logical Volume sizes are not a fixed size  as  compared
       to  other SCSI disk devices.  The size of the Logical Volume is config‐
       urable based on needs.  The DYNAMIC nature of Logical Volume  sizes  is
       dealt  with by defining RAID devices as DYNAMIC.	 Only partitions a, b,
       c, and g are defined.  If needed, the disklabel(8) command can  be  run
       to change and define partitions for RAID devices.

       Usually,	 the  dsk?a partition is used for the root file system and the
       dsk?b partition as a paging area.  The dsk?c partition can be used  for
       disk-to-disk copying because it maps the entire disk.

       The starting location and length (in 512-byte sectors) of the disk par‐
       titions of each drive are shown	in  the	 following  tables.  Partition
       sizes can be changed by using the disklabel(8) command.

       RZ24L Partitions

       ────────────────────────
       Disk    Start	Length
       ────────────────────────
       dsk?a   0	40960
       dsk?b   40960	122880
       dsk?c   0	479350
       dsk?d   163840	105170
       dsk?e   269010	105170
       dsk?f   374180	105170

       dsk?g   163840	315510
       dsk?h   0	0
       ────────────────────────

       RZ25 Partitions

       ────────────────────────
       Disk    Start	Length
       ────────────────────────
       dsk?a   0	131072
       dsk?b   131072	262144
       dsk?c   0	832527
       dsk?d   393216	146437
       dsk?e   539653	146437
       dsk?f   686090	146437
       dsk?g   393216	439311
       dsk?h   0	0
       ────────────────────────

       RZ25L and RZ25M Partitions

       ─────────────────────────
       Disk    Start	Length
       ─────────────────────────
       dsk?a   0	131072
       dsk?b   131072	262144
       dsk?c   0	1046206
       dsk?d   393216	217663
       dsk?e   610879	217663
       dsk?f   828542	217664
       dsk?g   393216	652990
       dsk?h   0	0
       ─────────────────────────

       RZ26, RZ26L, and RZ26N Partitions

       ──────────────────────────
       Disk    Start	 Length
       ──────────────────────────
       dsk?a   0	 131072
       dsk?b   131072	 262144
       dsk?c   0	 2050860
       dsk?d   393216	 552548
       dsk?e   945764	 552548
       dsk?f   1498312	 552548
       dsk?g   393216	 819200
       dsk?h   1212416	 838444
       ──────────────────────────

       RZ28, RZ28B, RZ28L, RZ28M. and RZ1B* Partitions

       ──────────────────────────
       Disk    Start	 Length
       ──────────────────────────
       dsk?a   0	 131072
       dsk?b   131072	 401408
       dsk?c   0	 4110480
       dsk?d   532480	 1191936
       dsk?e   1724416	 1191936
       dsk?f   2916352	 1194128
       dsk?g   532480	 1787904
       dsk?h   2320384	 1790096
       ──────────────────────────

       RZ29, RZ29B, RZ29L, RZ29M and RZ1C* Partitions

       ──────────────────────────
       Disk    Start	 Length
       ──────────────────────────
       dsk?a   0
       dsk?b   131072	 401408
       dsk?c   0	 8380080
       dsk?d   532480	 2623488
       dsk?e   3155968	 2623488
       dsk?f   5779456	 2600624

       dsk?g   532480	 3936256
       dsk?h   4468736	 3911344
       ──────────────────────────

       RZ55 Partitions

       ────────────────────────
       Disk    Start	Length
       ────────────────────────
       dsk?a   0	131072
       dsk?b   131072	262144
       dsk?c   0	649040
       dsk?d   0	0
       dsk?e   0	0
       dsk?f   0	0
       dsk?g   393216	255824
       dsk?h   0	0
       ────────────────────────

       RZ56 Partitions

       ──────────────────────────
       Disk    Start	 Length
       ──────────────────────────
       dsk?a   0	 131072
       dsk?b   131072	 262144
       dsk?c   0	 1299174
       dsk?d   393216	 301986
       dsk?e   695202	 301986
       dsk?f   997188	 301986
       dsk?g   393216	 819200
       dsk?h   1212416	 6758
       ──────────────────────────

       RZ58 Partitions

       ──────────────────────────
       Disk    Start	 Length
       ──────────────────────────
       dsk?a   0	 131072
       dsk?b   131072	 262144
       dsk?c   0	 2698061
       dsk?d   393216	 768281
       dsk?e   1161497	 768282
       dsk?f   1929779	 768282
       dsk?g   393216	 819200
       dsk?h   1212416	 1485645
       ──────────────────────────

       RZ73 Partitions

       ──────────────────────────
       Disk    Start	 Length
       ──────────────────────────
       dsk?a   0	 131072
       dsk?b   131072	 262144
       dsk?c   0	 3907911
       dsk?d   393216	 1171565
       dsk?e   1564781	 1171565
       dsk?f   2736346	 1171565
       dsk?g   393216	 819200
       dsk?h   1212416	 2695495
       ──────────────────────────

       RZ74 Partitions

       ──────────────────────────
       Disk    Start	 Length
       ──────────────────────────
       dsk?a   0	 131072
       dsk?b   131072	 393216
       dsk?c   0	 6976375
       dsk?d   524288	 150400
       dsk?e   2674688	 2150400
       dsk?f   4825088	 2151287

       dsk?g   524288	 3225600
       dsk?h   3749888	 3226487
       ──────────────────────────

       HSZ10, HSZ40, HSZ50, HSZ70  (RAID) Partitions

       ───────────────────────────────
       Disk    Start	 Length
       ───────────────────────────────
       dsk?a   0	 131072
       dsk?b   131072	 262144
       dsk?c   0	 end of media
       dsk?d   0	 0
       dsk?e   0	 0
       dsk?f   0	 0
       dsk?g   393216	 end of media
       dsk?h   0	 0
       ───────────────────────────────

       RRD42, RRD43, RRD44, RRD45, and RRD46(Read-Only) Partitions (CD-ROM)

       ─────────────────────────────────────
       Disk    Start   Length
       ─────────────────────────────────────
       dsk?a   0       (size varies per CD)
       dsk?b   0       0
       dsk?c   0       (size varies per CD)
       dsk?d   0       0
       dsk?e   0       0
       dsk?f   0       0
       dsk?g   0       0
       dsk?h   0       0
       ─────────────────────────────────────

       RX23HD and RX26HD Partitions (High-Density)

       ───────────────────────
       Disk    Start   Length
       ───────────────────────
       dsk?a   0       2880
       dsk?b   0       0
       dsk?c   0       2880
       dsk?d   0       0
       dsk?e   0
       dsk?f   0       0
       dsk?g   0       0
       dsk?h   0       0
       ───────────────────────

       RX23DD and RX26DD Partitions (Double-Density)

       ─────────────────────────
       Disk	 Start	 Length
       ─────────────────────────
       dsk?a	 0	 1440
       dsk?b	 0	 0
       dsk?c	 0	 1440
       dsk?d	 0	 0
       dsk?e	 0	 0
       dsk?f 0	 0
       dsk?g	 0	 0
       dsk?h	 0	 0
       ─────────────────────────

       RX23SD and RX26SD Partitions (Single-Density)

       ───────────────────────
       Disk    Start   Length
       ───────────────────────
       dsk?a   0       720
       dsk?b   0       0
       dsk?c   0       720
       dsk?d   0       0
       dsk?e   0       0
       dsk?f   0       0

       dsk?g   0       0
       dsk?h   0       0
       ───────────────────────

       RX26 Partitions (Extra-Density Floppy)

       ───────────────────────
       Disk    Start   Length
       ───────────────────────
       dsk?a   0       5760
       dsk?b   0       0
       dsk?c   0       5760
       dsk?d   0       0
       dsk?e   0       0
       dsk?f   0       0
       dsk?g   0       0
       dsk?h   0       0
       ───────────────────────

       RX33 Partitions (Extra-Density)

       ───────────────────────
       Disk    Start   Length
       ───────────────────────
       dsk?a   0       2400
       dsk?b   0       0
       dsk?c   0       2400
       dsk?d   0       0
       dsk?e   0       0
       dsk?f   0       0
       dsk?g   0       0
       dsk?h   0       0
       ───────────────────────

       RX33HD Partitions (High-Density)

       ───────────────────────
       Disk    Start   Length
       ───────────────────────
       dsk?a   0       1440
       dsk?b   0       0
       dsk?c   0       1440
       dsk?d   0       0
       dsk?e   0       0
       dsk?f   0       0
       dsk?g   0       0
       dsk?h   0       0
       ───────────────────────

       RX33DD Partitions (Double-Density)

       ───────────────────────
       Disk    Start   Length
       ───────────────────────
       dsk?a   0       800
       dsk?b   0       0
       dsk?c   0       800
       dsk?d   0       0
       dsk?e   0       0
       dsk?f   0       0
       dsk?g   0       0
       dsk?h   0       0
       ───────────────────────

       RX33SD Partitions (Single-Density)

       ───────────────────────
       Disk    Start   Length
       ───────────────────────
       dsk?a   0       720
       dsk?b   0       0
       dsk?c   0       720
       dsk?d   0       0
       dsk?e   0       0
       dsk?f   0       0

       dsk?g   0       0
       dsk?h   0       0
       ───────────────────────

EXAMPLES
       The  following  example	shows the configuration specification that you
       might have for a DEC 3000 Model 500 system with a PMAZC	controller  in
       slot 0 and KZTSA devices in slots 1 and 2:

       bus tc0 at nexus?  config_driver	  tcds config_driver   tza

       The  following  system contains an NCR 810 controller for attaching CD-
       ROMS, KZPSA adapters for shared storage cluster connectivity, and KZPBA
       (qlogic) adapters:

       bus  pci0  at * config_driver   psiop config_driver   pza config_driver
       isp

FILES
       /dev/disk/dsk??

       /dev/rdisk/dsk??

       /etc/disktab

       /sys/conf/SYSTEM

SEE ALSO
       Misc: RAID(7), SCSI(7), tz(7)

       Commands: disklabel(8), hwmgr(8), dsfmgr(8) MAKEDEV(8), uerf(8)

									 rz(7)
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