CentOS 5上部署udev-服务器评测

首先来简要的介绍下什么是udev,udev是Linux kernel 2.6系列的通用内核设备管理器,以守护进程的方式运行于Linux系统，并监听在新设备初始化或设备从系统中移除时，内核（通过netlink socket）所发出的uevent；简单点讲就是当有多块磁盘的时候，可以用udev来固定磁盘对应的设备名；之前在部署11g rac的时候都偏好使用asmlib，在最近一次的部署中asmlib出现了问题，而又没有时间去排错，因而采用udev部署，故而简单记录下udev的配置过程！

一：模拟共享盘阵，这里采用先划分lvm，再通过iscsi共享的方式来模拟

[root@db1 ~]# pvcreate /dev/sdb
Physical volume “/dev/sdb” successfully created
[root@db1 ~]# vgcreate data /dev/sdb
/dev/hdc: open failed: Read-only file system
/dev/cdrom: open failed: Read-only file system
Attempt to close device ‘/dev/cdrom’ which is not open.
Volume group “data” successfully created
[root@db1 ~]# lvcreate -n crs1 -L 2G data
Logical volume “crs1” created
[root@db1 ~]# lvcreate -n crs2 -L 2G data
Logical volume “crs2” created
[root@db1 ~]# lvcreate -n crs3 -L 2G data
Logical volume “crs3” created
[root@db1 ~]# lvcreate -n data -L 10G data
Logical volume “data” created
[root@db1 ~]# lvcreate -n fra -L 10G data
Logical volume “fra” created
[root@db1 ~]# lvs
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
crs1 data -wi-a- 2.00G
crs2 data -wi-a- 2.00G
crs3 data -wi-a- 2.00G
data data -wi-a- 10.00G
fra data -wi-a- 10.00G
[root@db1 ~]# service tgtd start
Starting SCSI target daemon: [ OK ]
[root@db1 ~]# cat iscsi.sh
tgtadm –lld iscsi –op new –mode target –tid 1 -T iqn.2012-07-04.com.yang.rac:crs1
tgtadm –lld iscsi –op new –mode target –tid 2 -T iqn.2012-07-04.com.yang.rac:crs2
tgtadm –lld iscsi –op new –mode target –tid 3 -T iqn.2012-07-04.com.yang.rac:crs3
tgtadm –lld iscsi –op new –mode target –tid 4 -T iqn.2012-07-04.com.yang.rac:data
tgtadm –lld iscsi –op new –mode target –tid 5 -T iqn.2012-07-04.com.yang.rac:fra
tgtadm –lld iscsi –op new –mode logicalunit –tid 1 –lun 1 -b /dev/data/crs1
tgtadm –lld iscsi –op new –mode logicalunit –tid 1 –lun 2 -b /dev/data/crs2
tgtadm –lld iscsi –op new –mode logicalunit –tid 1 –lun 3 -b /dev/data/crs3
tgtadm –lld iscsi –op new –mode logicalunit –tid 1 –lun 4 -b /dev/data/data
tgtadm –lld iscsi –op new –mode logicalunit –tid 1 –lun 5 -b /dev/data/fra
tgtadm –lld iscsi –op bind –mode target –tid 1 -I ALL
tgtadm –lld iscsi –op bind –mode target –tid 2 -I ALL
tgtadm –lld iscsi –op bind –mode target –tid 3 -I ALL
tgtadm –lld iscsi –op bind –mode target –tid 4 -I ALL
tgtadm –lld iscsi –op bind –mode target –tid 5 -I ALL
[root@db1 ~]# tgtadm –lld iscsi -o show -m target
[root@db1 ~]# sh iscsi.sh
[root@db1 ~]# tgtadm –lld iscsi -o show -m target
Target 1: iqn.2012-07-04.com.yang.rac:crs1
System information:
Driver: iscsi
State: ready
I_T nexus information:
LUN information:
LUN: 0
Type: controller
SCSI ID: deadbeaf1:0
SCSI SN: beaf10
Size: 0 MB
Online: Yes
Removable media: No
Backing store: No backing store
LUN: 1
Type: disk
SCSI ID: deadbeaf1:1
SCSI SN: beaf11
Size: 2147 MB
Online: Yes
Removable media: No
Backing store: /dev/data/crs1
LUN: 2
Type: disk
SCSI ID: deadbeaf1:2
SCSI SN: beaf12
Size: 2147 MB
Online: Yes
Removable media: No
Backing store: /dev/data/crs2
LUN: 3
Type: disk
SCSI ID: deadbeaf1:3
SCSI SN: beaf13
Size: 2147 MB
Online: Yes
Removable media: No
Backing store: /dev/data/crs3
LUN: 4
Type: disk
SCSI ID: deadbeaf1:4
SCSI SN: beaf14
Size: 10737 MB
Online: Yes
Removable media: No
Backing store: /dev/data/data
LUN: 5
Type: disk
SCSI ID: deadbeaf1:5
SCSI SN: beaf15
Size: 10737 MB
Online: Yes
Removable media: No
Backing store: /dev/data/fra
Account information:
ACL information:
ALL
Target 2: iqn.2012-07-04.com.yang.rac:crs2
System information:
Driver: iscsi
State: ready
I_T nexus information:
LUN information:
LUN: 0
Type: controller
SCSI ID: deadbeaf2:0
SCSI SN: beaf20
Size: 0 MB
Online: Yes
Removable media: No
Backing store: No backing store
Account information:
ACL information:
Target 3: iqn.2012-07-04.com.yang.rac:crs3
System information:
Driver: iscsi
State: ready
I_T nexus information:
LUN information:
LUN: 0
Type: controller
SCSI ID: deadbeaf3:0
SCSI SN: beaf30
Size: 0 MB
Online: Yes
Removable media: No
Backing store: No backing store
Account information:
ACL information:
Target 4: iqn.2012-07-04.com.yang.rac:data
System information:
Driver: iscsi
State: ready
I_T nexus information:
LUN information:
LUN: 0
Type: controller
SCSI ID: deadbeaf4:0
SCSI SN: beaf40
Size: 0 MB
Online: Yes
Removable media: No
Backing store: No backing store
Account information:
ACL information:
Target 5: iqn.2012-07-04.com.yang.rac:fra
System information:
Driver: iscsi
State: ready
I_T nexus information:
LUN information:
LUN: 0
Type: controller
SCSI ID: deadbeaf5:0
SCSI SN: beaf50
Size: 0 MB
Online: Yes
Removable media: No
Backing store: No backing store
Account information:
ACL information:

二:在客户端上挂载前面模拟出的共享磁盘阵列

[root@db2 ~]# iscsiadm –mode discovery –type sendtargets –portal 192.168.123.10  
192.168.123.10:3260,1 iqn.2012-07-04.com.yang.rac:fra  
192.168.123.10:3260,1 iqn.2012-07-04.com.yang.rac:crs1  
192.168.123.10:3260,1 iqn.2012-07-04.com.yang.rac:crs3  
192.168.123.10:3260,1 iqn.2012-07-04.com.yang.rac:data  
192.168.123.10:3260,1 iqn.2012-07-04.com.yang.rac:crs2  
 
[root@db2 ~]# iscsiadm –mode node –targetname iqn.2012-07-04.com.yang.rac:crs1 –portal 192.168.123.10 –login  
[root@db2 ~]# iscsiadm –mode node –targetname iqn.2012-07-04.com.yang.rac:crs2 –portal 192.168.123.10 –login  
[root@db2 ~]# iscsiadm –mode node –targetname iqn.2012-07-04.com.yang.rac:crs3 –portal 192.168.123.10 –login  
[root@db2 ~]# iscsiadm –mode node –targetname iqn.2012-07-04.com.yang.rac:data –portal 192.168.123.10 –login  
[root@db2 ~]# iscsiadm –mode node –targetname iqn.2012-07-04.com.yang.rac:fra  –portal 192.168.123.10 –login  
 
[root@db2 ~]# fdisk -l  
Disk /dev/sda: 85.8 GB, 85899345920 bytes  
255 heads, 63 sectors/track, 10443 cylinders  
Units = cylinders of 16065 * 512 = 8225280 bytes  
 
   Device Boot      Start         End      Blocks   Id  System  
/dev/sda1   *           1          13      104391   83  Linux  
/dev/sda2              14         523     4096575   82  Linux swap / Solaris  
/dev/sda3             524       10443    79682400   83  Linux  
 
Disk /dev/sdb: 2147 MB, 2147483648 bytes  
67 heads, 62 sectors/track, 1009 cylinders  
Units = cylinders of 4154 * 512 = 2126848 bytes  
 
Disk /dev/sdb doesn’t contain a valid partition table  
 
Disk /dev/sdc: 2147 MB, 2147483648 bytes  
67 heads, 62 sectors/track, 1009 cylinders  
Units = cylinders of 4154 * 512 = 2126848 bytes  
 
Disk /dev/sdc doesn’t contain a valid partition table  
 
Disk /dev/sdd: 2147 MB, 2147483648 bytes  
67 heads, 62 sectors/track, 1009 cylinders  
Units = cylinders of 4154 * 512 = 2126848 bytes  
 
Disk /dev/sdd doesn’t contain a valid partition table  
 
Disk /dev/sde: 10.7 GB, 10737418240 bytes  
64 heads, 32 sectors/track, 10240 cylinders  
Units = cylinders of 2048 * 512 = 1048576 bytes  
 
Disk /dev/sde doesn’t contain a valid partition table  
 
Disk /dev/sdf: 10.7 GB, 10737418240 bytes  
64 heads, 32 sectors/track, 10240 cylinders  
Units = cylinders of 2048 * 512 = 1048576 bytes  
 
Disk /dev/sdf doesn’t contain a valid partition table

三：开始配置udev

[root@db2 ~]# uname -r  //在本例中操作系统的版本位CentOS5.4 64bit  
2.6.18-164.el5  
[root@db2 ~]# lsb_release -a  
LSB Version:    :core-3.1-amd64:core-3.1-ia32:core-3.1-noarch:graphics-3.1-amd64:graphics-3.1-ia32:graphics-3.1-noarch  
Distributor ID: CentOS  
Description:    CentOS release 5.4 (Final)  
Release:        5.4  
Codename:       Final  
 
[root@db2 ~]# rpm -qa |grep udev  
udev-095-14.21.el5  
 
[root@db2 ~]# ps -ef |grep udev  
root      4646     1  0 10:14 ?        00:00:00 /sbin/udevd -d  
root      6023  3039  0 10:32 pts/0    00:00:00 grep udev  
 
[root@db2 ~]# grep -v ^# /etc/udev/udev.conf  |grep -v ^$  
udev_log=“err” 
 
[root@db2 ~]# scsi_id -g -u -s /block/sdb  
S_beaf11  
[root@db2 ~]# scsi_id -g -u -s /block/sdc  
S_beaf12  
[root@db2 ~]# scsi_id -g -u -s /block/sdd  
S_beaf13  
[root@db2 ~]# scsi_id -g -u -s /block/sde  
S_beaf14  
[root@db2 ~]# scsi_id -g -u -s /block/sdf  
S_beaf15  
 
[root@db2 ~]# cat /etc/udev/rules.d/99-raw.rules   
KERNEL==”sd*”, BUS==”scsi”, PROGRAM==”/sbin/scsi_id -g -u -s %p”, RESULT==”S_beaf11″, NAME=“asmdisk1”, OWNER=“grid”,   
 
GROUP=“asmadmin”, MODE=“0660” 
KERNEL==”sd*”, BUS==”scsi”, PROGRAM==”/sbin/scsi_id -g -u -s %p”, RESULT==”S_beaf12″, NAME=“asmdisk2”, OWNER=“grid”,   
 
GROUP=“asmadmin”, MODE=“0660” 
KERNEL==”sd*”, BUS==”scsi”, PROGRAM==”/sbin/scsi_id -g -u -s %p”, RESULT==”S_beaf13″, NAME=“asmdisk3”, OWNER=“grid”,   
 
GROUP=“asmadmin”, MODE=“0660” 
KERNEL==”sd*”, BUS==”scsi”, PROGRAM==”/sbin/scsi_id -g -u -s %p”, RESULT==”S_beaf14″, NAME=“asmdisk4”, OWNER=“grid”,   
 
GROUP=“asmadmin”, MODE=“0660” 
KERNEL==”sd*”, BUS==”scsi”, PROGRAM==”/sbin/scsi_id -g -u -s %p”, RESULT==”S_beaf15″, NAME=“asmdisk5”, OWNER=“grid”,   
 
GROUP=“asmadmin”, MODE=“0660” 
 
[root@db2 ~]# ll /dev/asm*  
ls: /dev/asm*: No such file or directory  
[root@db2 ~]# /sbin/udevcontrol reload_rules  
[root@db2 ~]# /sbin/start_udev   
Starting udev: [  OK  ]  
[root@db2 ~]# ll /dev/asm*  
brw-rw—- 1 grid asmadmin 8, 16 Jul  4 12:05 /dev/asmdisk1  
brw-rw—- 1 grid asmadmin 8, 32 Jul  4 12:05 /dev/asmdisk2  
brw-rw—- 1 grid asmadmin 8, 48 Jul  4 12:05 /dev/asmdisk3  
brw-rw—- 1 grid asmadmin 8, 64 Jul  4 12:05 /dev/asmdisk4  
brw-rw—- 1 grid asmadmin 8, 80 Jul  4 12:05 /dev/asmdisk5

备注：
1：在vmware中，scsi_id -g -u -s /block/sdb默认是不会出现uuid的，需要修改vmx文件，添加disk.EnableUUID参数
2：/block/sdb实际上是个不存在的路径，实际绝对路径是/sys/block/sdb，但使用scsi_id命令的时候必须用/block/sdb路径

CentOS 5上部署udev

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