disk, dsk, cdrom, rz - SCSI disk interface
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
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 buffer. 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 [Toc] [Back]
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 SCSItype
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 configurable 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 partitions of each drive are shown in the following
tables. Partition sizes can be changed by using the
disklabel(8) command.
RZ24L Partitions [Toc] [Back]
------------------------
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 [Toc] [Back]
------------------------
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 [Toc] [Back]
-------------------------
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 [Toc] [Back]
------------------------
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 [Toc] [Back]
--------------------------
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 [Toc] [Back]
--------------------------
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 [Toc] [Back]
--------------------------
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 [Toc] [Back]
--------------------------
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) Parti-
tions (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) [Toc] [Back]
-----------------------
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) [Toc] [Back]
-------------------------
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) [Toc] [Back]
-----------------------
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) [Toc] [Back]
-----------------------
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) [Toc] [Back]
-----------------------
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) [Toc] [Back]
-----------------------
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) [Toc] [Back]
-----------------------
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) [Toc] [Back]
-----------------------
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
-----------------------
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
/dev/disk/dsk??
/dev/rdisk/dsk??
/etc/disktab
/sys/conf/SYSTEM
Misc: RAID(7), SCSI(7), tz(7)
Commands: disklabel(8), hwmgr(8), dsfmgr(8) MAKEDEV(8),
uerf(8)
rz(7)
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