在linux上使用raw device方式

在linux上使用raw device一般有两个方式，下面分别测试一下：

第一种方式是非lvm方式，直接使用partion方式如下：

一，创建分区
[root@localhost ~]# fdisk -l

Disk /dev/sda: 12.8 GB, 12884901888 bytes
255 heads, 63 sectors/track, 1566 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id System
/dev/sda1   *           1          64      514048+ 83 Linux
/dev/sda2              65        1174     8916075   83 Linux
/dev/sda3            1175        1435     2096482+ 82 Linux swap
/dev/sda4            1436        1566     1052257+   5 Extended
/dev/sda5            1436        1566     1052226   83 Linux

Disk /dev/sdb: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sdb doesn't contain a valid partition table

Disk /dev/sdc: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sdc doesn't contain a valid partition table
[root@localhost oracle]# fdisk /dev/sdb


The number of cylinders for this disk is set to 1044.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
   (e.g., DOS FDISK, OS/2 FDISK)
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

Command (m for help): m
Command action
   a   toggle a bootable flag
   b   edit bsd disklabel
   c   toggle the dos compatibility flag
   d   delete a partition
   l   list known partition types
   m   print this menu
   n   add a new partition
   o   create a new empty DOS partition table
   p   print the partition table
   q   quit without saving changes
   s   create a new empty Sun disklabel
   t   change a partition's system id
   u   change display/entry units
   v   verify the partition table
   w   write table to disk and exit
   x   extra functionality (experts only)

Command (m for help): n p

Disk /dev/sdb: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id System

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-1044, default 1): 65
Last cylinder or +size or +sizeM or +sizeK (65-1044, default 1044):
Using default value 1044

Command (m for help): p

Disk /dev/sdb: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id System
/dev/sdb1              65        1044     7871850   83 Linux

Command (m for help): p

Disk /dev/sdb: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id System
/dev/sdb1              65        1044     7871850   83 Linux

Command (m for help): h
h: unknown command
Command action
   a   toggle a bootable flag
   b   edit bsd disklabel
   c   toggle the dos compatibility flag
   d   delete a partition
   l   list known partition types
   m   print this menu
   n   add a new partition
   o   create a new empty DOS partition table
   p   print the partition table
   q   quit without saving changes
   s   create a new empty Sun disklabel
   t   change a partition's system id
   u   change display/entry units
   v   verify the partition table
   w   write table to disk and exit
   x   extra functionality (experts only)

Command (m for help): d
Selected partition 1

Command (m for help): p

Disk /dev/sdb: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id System

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
1 p
Partition number (1-4): 1
First cylinder (1-1044, default 1): 1
Last cylinder or +size or +sizeM or +sizeK (1-1044, default 1044): 65

Command (m for help): p

Disk /dev/sdb: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id System
/dev/sdb1               1          65      522081   83 Linux

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 2
First cylinder (66-1044, default 66):
Using default value 66
Last cylinder or +size or +sizeM or +sizeK (66-1044, default 1044): 130

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
3
Invalid partition number for type `3'
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 3
First cylinder (131-1044, default 131):
Using default value 131
Last cylinder or +size or +sizeM or +sizeK (131-1044, default 1044): 196

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Selected partition 4
First cylinder (197-1044, default 197): 4
Value out of range.
First cylinder (197-1044, default 197):
Using default value 197
Last cylinder or +size or +sizeM or +sizeK (197-1044, default 1044): 262

Command (m for help): p

Disk /dev/sdb: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id System
/dev/sdb1               1          65      522081   83 Linux
/dev/sdb2              66         130      522112+ 83 Linux
/dev/sdb3             131         196      530145   83 Linux
/dev/sdb4             197         262      530145   83 Linux

二，绑定raw device
[root@localhost oracle]# raw /dev/raw/raw1 /dev/sdb1
/dev/raw/raw1: bound to major 8, minor 18
[root@localhost oracle]# raw /dev/raw/raw2 /dev/sdb2
/dev/raw/raw2: bound to major 8, minor 18
[root@localhost oracle]# raw /dev/raw/raw3 /dev/sdb3
/dev/raw/raw3: bound to major 8, minor 18
[root@localhost oracle]# raw /dev/raw/raw4 /dev/sdb4
/dev/raw/raw4: bound to major 8, minor 18
[root@localhost oracle]#vi /etc/sysconfig/rawdevices
在文件中加入如下内容:
/dev/raw/raw1 /dev/sdb1
/dev/raw/raw2 /dev/sdb2
/dev/raw/raw3 /dev/sdb4
/dev/raw/raw4 /dev/sdb4
另执行 /etc/init.d/rawdevices restart 使配置文件中的裸设备生效，执行 /sbin/chkconfig rawdevices on 保证机器启动的时候裸设备能够加载。

三，授权
[root@localhost oracle]# chown -R oracle:dba /dev/raw/raw1
[root@localhost oracle]# chown -R oracle:dba /dev/raw/raw2
[root@localhost oracle]# chown -R oracle:dba /dev/raw/raw3
[root@localhost oracle]# chown -R oracle:dba /dev/raw/raw4
另修改配置文件/etc/udev/permissions.d/50-udev.permissions
注释掉raw/*:root:disk:0660，添加新行raw/*:oracle:dba:0660
此时，如绑定raw device，则默认权限为oracle:dba了。
--另如需要可以进行相应链接，
如ln -s /dev/raw/raw1 /u1/oracle/oradata/test10g/test_raw1.dbf,然后可以直接为oracle所用了。


另一种是lvm的方式，测试如下：
一，创建pv
[root@localhost ~]# pvcreate -M2 --metadatasize 100M /dev/sdb7 /dev/sdb8 /dev/sdb9 /dev/sdb10 /dev/sdc
Physical volume "/dev/sdb7" successfully created
Physical volume "/dev/sdb8" successfully created
Physical volume "/dev/sdb9" successfully created
Physical volume "/dev/sdb10" successfully created
Physical volume "/dev/sdc" successfully created
[root@localhost ~]# lvmdiskscan
/dev/ramdisk [       16.00 MB]
/dev/ram     [       16.00 MB]
/dev/sda1    [      502.00 MB]
/dev/ram2    [       16.00 MB]
/dev/root    [        8.50 GB]
/dev/ram3    [       16.00 MB]
/dev/sda3    [        2.00 GB]
/dev/ram4    [       16.00 MB]
/dev/ram5    [       16.00 MB]
/dev/sda5    [        1.00 GB]
/dev/ram6    [       16.00 MB]
/dev/ram7    [       16.00 MB]
/dev/ram8    [       16.00 MB]
/dev/ram9    [       16.00 MB]
/dev/ram10   [       16.00 MB]
/dev/ram11   [       16.00 MB]
/dev/ram12   [       16.00 MB]
/dev/ram13   [       16.00 MB]
/dev/ram14   [       16.00 MB]
/dev/ram15   [       16.00 MB]
/dev/sdb1    [      980.50 MB]
/dev/sdb2    [      980.53 MB]
/dev/sdb3    [        1.92 GB]
/dev/sdb5    [      509.84 MB]
/dev/sdb6    [      549.07 MB]
/dev/sdb7    [      509.84 MB] LVM physical volume
/dev/sdb8    [      509.84 MB] LVM physical volume
/dev/sdb9    [      549.07 MB] LVM physical volume
/dev/sdb10   [      627.51 MB] LVM physical volume
/dev/sdb11   [     1011.88 MB]
/dev/sdc     [        8.00 GB] LVM physical volume
3 disks
23 partitions
1 LVM physical volume whole disk
4 LVM physical volumes

二，创建vg
[root@localhost ~]# vgcreate vg_db1 /dev/sdc -s 128m
Volume group "vg_db1" successfully created
[root@localhost ~]# vgcreate vg_db2 /dev/sdc -s 128m
Volume group "vg_db2" successfully created

三，创建lv
[root@localhost ~]# lvcreate -L 512m -I 64k vg_db2 -n lv_db2_02
Ignoring stripesize argument with single stripe
Logical volume "lv_db2_02" created
[root@localhost ~]# lvcreate -L 1024m -I 64k vg_db2 -n lv_db2_03
Ignoring stripesize argument with single stripe
Logical volume "lv_db2_03" created
[root@localhost ~]# lvcreate -L 512m -I 64k vg_db2 -n lv_db2_04
Ignoring stripesize argument with single stripe
Logical volume "lv_db2_04" created
[root@localhost ~]# lvcreate -L 2048m -I 64k vg_db2 -n lv_db2_05
Ignoring stripesize argument with single stripe
Logical volume "lv_db2_05" created

四，绑定
[root@localhost ~]# raw /dev/raw/raw１ /dev/mapper/vg_db2-lv_db2_0１
/dev/raw/raw4: bound to major 253, minor 5
[root@localhost ~]# raw /dev/raw/raw２ /dev/mapper/vg_db2-lv_db2_0２
/dev/raw/raw4: bound to major 253, minor 5
[root@localhost ~]# raw /dev/raw/raw３ /dev/mapper/vg_db2-lv_db2_0３
/dev/raw/raw4: bound to major 253, minor 5
[root@localhost ~]# raw /dev/raw/raw４ /dev/mapper/vg_db2-lv_db2_0４
/dev/raw/raw4: bound to major 253, minor 5
后面授权等作业和第一种方式类同，上面要注意的是lv的命名方式，命名方式分解如下：
/dev/mapper/+ vgname + '-' + lvname.