建立ASM磁盘组

ASM磁盘组是做为一个逻辑单元管理的一个ASM磁盘池。与其余任何LVM同样，ASM管理大量物理卷并将其做为一个或多个逻辑卷呈交给Oracle。物理卷能够是实际的磁盘或磁盘的分区，或者是隶属操做系统的卷管理器的卷。不管采用哪一种方式，都不能使用任何文件系统格式化，必须是裸设备。

在Linux上，ASM能引用磁盘做为裸设备，或经过使用ASMLib软件。

• 直接使用裸设备的方法：

1. 在RHEL6之前的能够直接经过rawdevices的管理方法，系统安装后默认已存在/etc/init.d/rawdevices和/etc/sysconfig/rawdevices这两个文件。

# cat /etc/redhat-release Red Hat Enterprise Linux Server release 5.8 (Tikanga) # rpm -qf /etc/init.d/rawdevices /etc/sysconfig/rawdevices initscripts-8.45.42-1.el5 initscripts-8.45.42-1.el5 # cat /etc/init.d/rawdevices #!/bin/bash # # rawdevices This shell script assignes rawdevices to block devices # # chkconfig: 345 56 44 # description: This scripts assignes raw devices to block devices \ # (such as hard drive partitions). This is for the use \ # of applications such as Oracle. You can set up the \ # raw device to block device mapping by editing \ # the file /etc/sysconfig/rawdevices. # config: /etc/sysconfig/rawdevices [ -f /bin/raw ] || exit 0 [ -f /etc/sysconfig/rawdevices ] || exit 0 # Exit if the file just has the default comments. LC_ALL=C /bin/egrep -q -v "^ *#" /etc/sysconfig/rawdevices 2>/dev/null || exit 0 . /etc/init.d/functions function assign_raw() { LC_ALL=C egrep -v '^ *#' /etc/sysconfig/rawdevices | while read RAW BLOCK; do if [ -n "$RAW" -a -n "$BLOCK" ]; then rawdirname=${RAW%/*} if [ "$rawdirname" = "/dev" -a -d /dev/raw ]; then echo $" Please correct your /etc/sysconfig/rawdevices:" echo $" rawdevices are now located in the directory /dev/raw/ " echo $" If the command 'raw' still refers to /dev/raw as a file." echo $" you'll have to upgrade your util-linux package" exit 0 fi if [ "$rawdirname" = "/dev/raw" -a -f /dev/raw ]; then echo $" Please correct your /etc/sysconfig/rawdevices:" echo $" rawdevices are now located in the directory /dev/raw/ " echo $" If the command 'raw' still refers to /dev/raw as a file." echo $" you'll have to upgrade your util-linux package" exit 0 fi echo " $RAW --> $BLOCK"; raw $RAW $BLOCK fi done } # See how we were called. case "$1" in start) # Assign devices echo $"Assigning devices: " assign_raw #添加如下两行(默认不存在)，即默认状况下生成的裸设备为root全部， #因此必须修改属主，不然oracle用户没法使用裸设备 sleep 5 chown -R oracle:oinstall /dev/raw/ echo $"done" ;; stop) # No action to be taken here ;; status) ID=`id -u` if [ $ID -eq 0 ]; then raw -qa else echo $"You need to be root to use this command ! " fi ;; restart|reload) $0 start ;; *) echo $"Usage: $0 {start|stop|status|restart}" exit 1 esac exit 0

# vi /etc/sysconfig/rawdevices //映射将要绑定的裸设备 /dev/raw/raw10 /dev/sda10 /dev/raw/raw11 /dev/sda11 /dev/raw/raw12 /dev/sda12 /dev/raw/raw13 /dev/sda13 /dev/raw/raw14 /dev/sda14 # chkconfig rawdevices on # service rawdevices start Assigning devices: /dev/raw/raw10 --> /dev/sda10 /dev/raw/raw10: bound to major 8, minor 10 /dev/raw/raw11 --> /dev/sda11 /dev/raw/raw11: bound to major 8, minor 11 /dev/raw/raw12 --> /dev/sda12 /dev/raw/raw12: bound to major 8, minor 12 /dev/raw/raw13 --> /dev/sda13 /dev/raw/raw13: bound to major 8, minor 13 /dev/raw/raw14 --> /dev/sda14 /dev/raw/raw14: bound to major 8, minor 14 done # ls -l /dev/raw/ total 0 crw-rw----. 1 oracle oinstall 162, 10 May 27 08:37 raw10 crw-rw----. 1 oracle oinstall 162, 11 May 27 08:37 raw11 crw-rw----. 1 oracle oinstall 162, 12 May 27 08:37 raw12 crw-rw----. 1 oracle oinstall 162, 13 May 27 08:37 raw13 crw-rw----. 1 oracle oinstall 162, 14 May 27 08:37 raw14 crw-rw----. 1 oracle oinstall 162, 0 May 27 08:19 rawctl # raw -qa /dev/raw/raw10: bound to major 8, minor 10 /dev/raw/raw11: bound to major 8, minor 11 /dev/raw/raw12: bound to major 8, minor 12 /dev/raw/raw13: bound to major 8, minor 13 /dev/raw/raw14: bound to major 8, minor 14

2. 在RHEL6中，系统里面虽然已经不存在/etc/sysconfig/rawdevices和/etc/init.d/rawdevices文件了，可是依然支持rawdevices的方式，能够经过以下方法来管理raw文件。

1. 手动建立/etc/sysconfig/rawdevices和/etc/init.d/rawdevices文件，而后依然以rawdevices的方式

2. 经过udev来管理raw,一样也能够经过udev固定磁盘对应的设备名

如下介绍udev的方式：

# fdisk -l /dev/sdb Disk /dev/sdb: 2147 MB, 2147483648 bytes 255 heads, 63 sectors/track, 261 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sdb1 1 261 2096451 5 Extended /dev/sdb5 1 25 200749+ 83 Linux /dev/sdb6 26 50 200781 83 Linux /dev/sdb7 51 75 200781 83 Linux /dev/sdb8 76 100 200781 83 Linux /dev/sdb9 101 125 200781 83 Linux # vi /etc/udev/rules.d/60-raw.rules ACTION=="add",KERNEL=="sdb5",RUN+="/bin/raw /dev/raw/raw5 %N",OWNER="oracle", GROUP="oinstall", MODE="660" ACTION=="add",KERNEL=="sdb6",RUN+="/bin/raw /dev/raw/raw6 %N",OWNER="oracle", GROUP="oinstall", MODE="660" ACTION=="add",KERNEL=="sdb7",RUN+="/bin/raw /dev/raw/raw7 %N",OWNER="oracle", GROUP="oinstall", MODE="660" ACTION=="add",KERNEL=="sdb8",RUN+="/bin/raw /dev/raw/raw8 %N",OWNER="oracle", GROUP="oinstall", MODE="660" ACTION=="add",KERNEL=="sdb9",RUN+="/bin/raw /dev/raw/raw9 %N",OWNER="oracle", GROUP="oinstall", MODE="660" # raw -qa # start_udev Starting udev: [ OK ] # raw -qa /dev/raw/raw5: bound to major 8, minor 21 /dev/raw/raw6: bound to major 8, minor 22 /dev/raw/raw7: bound to major 8, minor 23 /dev/raw/raw8: bound to major 8, minor 24 /dev/raw/raw9: bound to major 8, minor 25 # ls -l /dev/raw total 0 crw-rw---- 1 oracle oinstall 162, 5 Jun 9 17:15 raw5 crw-rw---- 1 oracle oinstall 162, 6 Jun 9 17:15 raw6 crw-rw---- 1 oracle oinstall 162, 7 Jun 9 17:15 raw7 crw-rw---- 1 oracle oinstall 162, 8 Jun 9 17:15 raw8 crw-rw---- 1 oracle oinstall 162, 9 Jun 9 17:15 raw9

• ASMLib：(非Linux系统只能使用裸设备的方法)

ASMLib是一组可选的位于ASM和硬件之间的一个内核驱动程序工具,也是做为一个应用程序库经过Oracle数据库软件访问ASM磁盘。

它是Oracle 10g和11g单实例数据库以及RAC的ASM特性支持库。ASM和数据库实例可使用ASMLib做为可替代的磁盘访问接口。

ASMLib有如下三个组件:

内核驱动：oracleasm            Linux中支持oracle ASMLib的内核驱动程序（需根据内核版本下载）

支持工具：oracleasm-support    提供用于配置和启动ASM驱动程序的实用工具

应用程序库：oracleasmlib       提供了实际的ASM库

# uname -r 2.6.18-308.el5 # ls oracleasm* oracleasm-2.6.18-308.el5-2.0.5-1.el5.x86_64.rpm oracleasm-support-2.1.8-1.el5.x86_64.rpm oracleasmlib-2.0.4-1.el5.x86_64.rpm # rpm -ivh oracleasmlib* warning: oracleasm-2.6.18-308.el5-2.0.5-1.el5.x86_64.rpm: Header V3 DSA signature: NOKEY, key ID 1e5e0159 Preparing... ########################################### [100%] 1:oracleasm-support ########################################### [100%] 2:oracleasm-2.6.18-308.el########################################### [100%] 3:oracleasmlib ########################################### [100%] # /etc/init.d/oracleasm configure Configuring the Oracle ASM library driver. This will configure the on-boot properties of the Oracle ASM library driver. The following questions will determine whether the driver is loaded on boot and what permissions it will have. The current values will be shown in brackets ('[]'). Hitting <ENTER> without typing an answer will keep that current value. Ctrl-C will abort. Default user to own the driver interface []: oracle Default group to own the driver interface []: oinstall Start Oracle ASM library driver on boot (y/n) [n]: y Scan for Oracle ASM disks on boot (y/n) [y]: Writing Oracle ASM library driver configuration: done Initializing the Oracle ASMLib driver: [ OK ] Scanning the system for Oracle ASMLib disks: [ OK ] # /etc/init.d/oracleasm enable Writing Oracle ASM library driver configuration: [ OK ] Loading module "oracleasm": [ OK ] Mounting ASMlib driver filesystem: [ OK ] Scanning system for ASM disks: [ OK ] # /etc/init.d/oracleasm createdisk VOL1 /dev/sda5 Marking disk "VOL2" as an ASM disk: [ OK ] # /etc/init.d/oracleasm createdisk VOL2 /dev/sda6 Marking disk "VOL2" as an ASM disk: [ OK ] # /etc/init.d/oracleasm createdisk VOL3 /dev/sda7 Marking disk "VOL3" as an ASM disk: [ OK ] # /etc/init.d/oracleasm createdisk VOL4 /dev/sda8 Marking disk "VOL4" as an ASM disk: [ OK ] # /etc/init.d/oracleasm createdisk VOL5 /dev/sda9 Marking disk "VOL5" as an ASM disk: [ OK ] # /etc/init.d/oracleasm scandisks Scanning system for ASM disks:[ OK ] # /etc/init.d/oracleasm listdisks VOL1 VOL2 VOL3 VOL4 VOL5 # ll /dev/oracleasm/disks/ total 0 brw-rw---- 1 oracle oinstall 8, 5 Jun 3 09:53 VOL1 brw-rw---- 1 oracle oinstall 8, 6 Jun 3 10:00 VOL2 brw-rw---- 1 oracle oinstall 8, 7 Jun 3 10:00 VOL3 brw-rw---- 1 oracle oinstall 8, 8 Jun 3 10:00 VOL4 brw-rw---- 1 oracle oinstall 8, 9 Jun 3 10:00 VOL5 //到这里ASM的工做就完成了，这里的磁盘能够被Oracle所使用，使用oracleasm-discover来探测ASM硬盘： # oracleasm-discover Using ASMLib from /opt/oracle/extapi/64/asm/orcl/1/libasm.so [ASM Library - Generic Linux, version 2.0.4 (KABI_V2)] Discovered disk: ORCL:VOL1 [4899762 blocks (2508678144 bytes), maxio 512] Discovered disk: ORCL:VOL2 [4899762 blocks (2508678144 bytes), maxio 512] Discovered disk: ORCL:VOL3 [4899762 blocks (2508678144 bytes), maxio 512] Discovered disk: ORCL:VOL4 [4899762 blocks (2508678144 bytes), maxio 512] Discovered disk: ORCL:VOL5 [7373772 blocks (3775371264 bytes), maxio 512]