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DB2中使用裸设备作为表空间容器

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Release: 2016-06-07 16:06:41
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DB2中使用裸设备作为容器需要三个步骤:1. 创建LV。2. 绑定LV和裸设备 3.创建表空间 1. 创建lv root@ubuntu:~# vgdisplay -查看可用的Volume Group root@ubuntu:~# vgdisplay --- Volume group --- VG Name mainVG System ID Format lvm2 Metadata Areas 1 M

DB2中使用裸设备作为容器需要三个步骤:1. 创建LV。2. 绑定LV和裸设备 3.创建表空间

1. 创建lv

root@ubuntu:~# vgdisplay

root@ubuntu:~# vgdisplay

--- Volume group ---

VG Name mainVG

System ID

Format lvm2

Metadata Areas 1

Metadata Sequence No 4

VG Access read/write

VG Status resizable

MAX LV 0

Cur LV 3

Open LV 1

Max PV 0

Cur PV 1

Act PV 1

VG Size 2.00 GiB

PE Size 4.00 MiB

Total PE 511

Alloc PE / Size 125 / 500.00 MiB

Free PE / Size 386 / 1.51 GiB

VG UUID b15u8R-Kt91-Tgfe-2RX8-buKP-dfU9-Uw5a2J

root@ubuntu:~# lvcreate -L 200M -n testlv mainVG

Logical volume "testlv" created

root@ubuntu:~# ls -l /dev/mainVG/testlv

lrwxrwxrwx 1 root root 7 Oct 31 02:28 /dev/mainVG/testlv -> ../dm-3

root@ubuntu:~# ls -l /dev/dm-3

brw-rw---- 1 root disk 252, 3 Oct 31 02:28 /dev/dm-3

可以看到新创建的lv只是一个符号链接,指向块设备dm-3

2. 创建裸设备raw3,并绑定到lv上

root@ubuntu:~# modprobe raw

root@ubuntu:~# mknod /dev/raw/raw3 c 162 3

root@ubuntu:~# raw /dev/raw/raw3 /dev/mainVG/testlv

/dev/raw/raw3: bound to major 252, minor 3

root@ubuntu:~# chown qingsong:qingsong /dev/raw/raw3

root@ubuntu:~# ls -l /dev/raw/raw3

crw-rw---- 1 qingsong qingsong 162, 3 Oct 31 02:32 /dev/raw/raw3

3. 切换至实例用户,启动数据库,并创建表空间,容器使用刚刚创建的裸设备。

qingsong@ubuntu:~$ db2start

SQL1063N DB2START processing was successful.

qingsong@ubuntu:~$ db2 connect to qsmiao

Database Connection Information

Database server = DB2/LINUXX8664 10.5.4

SQL authorization ID = QINGSONG

Local database alias = QSMIAO

qingsong@ubuntu:~$ db2 "create tablespace lvtbs managed by database using(device '/dev/raw/raw3' 300)"

DB20000I The SQL command completed successfully.

不过,重启机器之后,创建的裸设备/dev/raw/raw3就会消失,目前没有找到解决办法,一种替代方案是一开机就自动创建一次,把下面4行添加进/etc/rc.local中

modprobe raw

mknod /dev/raw/raw3 c 162 3

raw /dev/raw/raw3 /dev/mainVG/thirdlv

chown qingsong:qingsong /dev/raw/raw3

测试环境:

Ubuntu 14.04

DB2 10.5.4

参考:

http://www.informix-zone.com/node/38#fromlog

欢迎批评指正

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