[[email protected] rules.d]# fdisk -l

Disk /dev/sda: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000023cd

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          64      512000   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              64        5222    41430016   8e  Linux LVM

Disk /dev/sdb: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x383bd4c4

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1        1044     8385898+  83  Linux
 

以上為磁碟資訊。

udevadm info -a -p /sys/block/sdb/sdb1查詢硬碟資訊

我們使用ATTR{start}=="63"  ATTR{size}=="16771797"來唯一標識這個裝置

[[email protected] rules.d]# udevadm info -a -p /sys/block/sdb/sdb1

Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.

  looking at device '/devices/pci0000:00/0000:00:0d.0/host1/target1:0:0/1:0:0:0/block/sdb/sdb1':
    KERNEL=="sdb1"
    SUBSYSTEM=="block"
    DRIVER==""
    ATTR{partition}=="1"
    ATTR{start}=="63"
    ATTR{size}=="16771797"
    ATTR{alignment_offset}=="0"
    ATTR{discard_alignment}=="0"
    ATTR{stat}=="     791    72121    73402      532        0        0        0        0        0      343      494"
    ATTR{inflight}=="       0        0"

  looking at parent device '/devices/pci0000:00/0000:00:0d.0/host1/target1:0:0/1:0:0:0/block/sdb':
    KERNELS=="sdb"
    SUBSYSTEMS=="block"
    DRIVERS==""
    ATTRS{range}=="16"
    ATTRS{ext_range}=="256"
    ATTRS{removable}=="0"
    ATTRS{ro}=="0"
    ATTRS{size}=="16777216"
    ATTRS{alignment_offset}=="0"
    ATTRS{discard_alignment}=="0"
    ATTRS{capability}=="52"
    ATTRS{stat}=="    1510    72178    79610      684        4        0        8      103        0      589      740"
    ATTRS{inflight}=="       0        0"

  looking at parent device '/devices/pci0000:00/0000:00:0d.0/host1/target1:0:0/1:0:0:0':
    KERNELS=="1:0:0:0"
    SUBSYSTEMS=="scsi"
    DRIVERS=="sd"
    ATTRS{device_blocked}=="0"
    ATTRS{type}=="0"
    ATTRS{scsi_level}=="6"
    ATTRS{vendor}=="ATA     "
    ATTRS{model}=="VBOX HARDDISK   "
    ATTRS{rev}=="1.0 "
    ATTRS{state}=="running"
    ATTRS{timeout}=="30"
    ATTRS{iocounterbits}=="32"
    ATTRS{iorequest_cnt}=="0x634"
    ATTRS{iodone_cnt}=="0x633"
    ATTRS{ioerr_cnt}=="0x9"
    ATTRS{modalias}=="scsi:t-0x00"
    ATTRS{evt_media_change}=="0"
    ATTRS{dh_state}=="detached"
    ATTRS{queue_depth}=="31"
    ATTRS{queue_ramp_up_period}=="120000"
    ATTRS{queue_type}=="simple"

  looking at parent device '/devices/pci0000:00/0000:00:0d.0/host1/target1:0:0':
    KERNELS=="target1:0:0"
    SUBSYSTEMS=="scsi"
    DRIVERS==""

  looking at parent device '/devices/pci0000:00/0000:00:0d.0/host1':
    KERNELS=="host1"
    SUBSYSTEMS=="scsi"
    DRIVERS==""

  looking at parent device '/devices/pci0000:00/0000:00:0d.0':
    KERNELS=="0000:00:0d.0"
    SUBSYSTEMS=="pci"
    DRIVERS=="ahci"
    ATTRS{vendor}=="0x8086"
    ATTRS{device}=="0x2829"
    ATTRS{subsystem_vendor}=="0x0000"
    ATTRS{subsystem_device}=="0x0000"
    ATTRS{class}=="0x010601"
    ATTRS{irq}=="21"
    ATTRS{local_cpus}=="3"
    ATTRS{local_cpulist}=="0-1"
    ATTRS{modalias}=="pci:v00008086d00002829sv00000000sd00000000bc01sc06i01"
    ATTRS{numa_node}=="-1"
    ATTRS{enable}=="1"
    ATTRS{broken_parity_status}=="0"
    ATTRS{msi_bus}==""

  looking at parent device '/devices/pci0000:00':
    KERNELS=="pci0000:00"
    SUBSYSTEMS==""
    DRIVERS==""
 

[[email protected] rules.d]# pwd
/etc/udev/rules.d
[[email protected] rules.d]# cat 99-oracle-asmdevices.rules 
KERNEL=="sdb1", SUBSYSTEM=="block", ATTR{start}=="63", ATTR{size}=="16771797", NAME="asmdisk1", OWNER="oracle", GROUP="oinstall", MODE="0660"

然後啟動udev：

[[email protected] rules.d]# cat 99-oracle-asmdevices.rules 
KERNEL=="sdb1", SUBSYSTEM=="block", ATTR{start}=="63", ATTR{size}=="16771797", NAME="asmdisk1", OWNER="oracle", GROUP="oinstall", MODE="0660"
[
 
[email protected] rules.d]# start_udev 
Starting udev:                                             [  OK  ]
[[email protected] rules.d]# cd /dev
[[email protected] dev]# pwd
/dev
[[email protected] dev]# ll asmdisk1 
brw-rw----. 1 oracle oinstall 8, 17 Aug  4 20:18 asmdisk1