分区0位根分区，包含启动的信息
分区2代表整个磁盘
交换分区可以是任何分区，默认为分区1
其它分区用户存放数据
逻辑设备名存放在/dev/dsk和/dev/rdsk中。这些名称是/devices目录下的符号连接。使用逻辑设备名便于系统管理员操作?nbsp;
Sun使用下列命名方式定义逻辑设备名：
/dev/[r]dsk/c#t#d#s#
c:逻辑控制器号
t:物理总线目标号
d:磁盘或逻辑单元号(LUN)
s:分区号
物理设备名表示设备的完整信息，如设备总线地址。物理设备名在/devices目录下。
# ls -l /dev/dsk/c0t3d0s0
lrwxrwxrwx 1 root root 86 Oct 20 16:04 /dev/dsk/c0t3d0s3 ->
../../devices/iommu@0,10000000/sbus@0,10001000/espdma@5,8400000/esp@5,880
0000/sd@3,0:d
实例名是系统设备的简称。例如：
sdn where s = SCSI, d = disk, and n = 逻辑磁盘号，例如sd0，表示第一个SCSI磁盘设备。
dmesg显示实例名
dmesg命令鉴别系统所连接的设备。以实例和物理设备名称的方式显示。
# dmesg|more
May 13 20:18
CPU0: SUNW,UltraSPARC (upaid 0 impl 0x10 ver 0x40 clock 167 MHz)
SunOS Release 5.7 Version Generic [Unix(R) System V Release 4.0]
Copyright (c) 1983-1998, Sun Microsystems, Inc.
NOTICE: 64 bit OS installed, but the 32-bit OS is the default
for the processor(s) on this system.
See boot(1M) for more information.
Booting the 32-bit OS ...
mem = 196608K (0xc000000)
avail mem = 189440000
Ethernet address = 8:0:20:9b:60:b5
root nexus = Sun Ultra 1 SBus (UltraSPARC 167MHz)
sbus0 at root: UPA 0x1f 0x0 ...
sbus0 is /sbus@1f,0
dma0 at sbus0: SBus0 slot 0xe offset 0x8400000
dma0 is /sbus@1f,0/espdma@e,8400000
/sbus@1f,0/espdma@e,8400000/esp@e,8800000 (esp0):
esp-options=0x46
...
...
prtconf用于显示系统的配置信息，包括内存、外围设备等。
# prtconf|more
System Configuration: Sun Microsystems sun4u
Memory size: 192 Megabytes
System Peripherals (Software Nodes):
SUNW,Ultra-1
packages (driver not attached)
terminal-emulator (driver not attached)
deblocker (driver not attached)
obp-tftp (driver not attached)
disk-label (driver not attached)
sun-keyboard (driver not attached)
ufs-file-system (driver not attached)
chosen (driver not attached)
openprom (driver not attached)
clIEnt-services (driver not attached)
options, instance #0
aliases (driver not attached)
memory (driver not attached)
virtual-memory (driver not attached)
counter-timer (driver not attached)
sbus, instance #0
SUNW,CS4231, instance #0 (driver not attached)
auxio (driver not attached)
...
...
当在系统中增加新设备时，需要重新配置系统的硬件信息。这样，系统就会重新构建/devices和/dev目录。
下面是新增加硬盘的步骤：
1.在根目录下创建一个名为/reconfiguration的空文件，然后重新关机。
2. 将硬盘接上机器，然后开机。
3.用format命令查看新增的硬盘。
# touch /reconfigure
# init 5
# format
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