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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 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
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 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
_______________________
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)
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Index for
Section 7 |
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Alphabetical
listing for R |
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Top of
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