Oracle之利用iscsi构建RAC共享存储测试

Centos下配置iscsi 共享存储

ISCSI存储分为服务端(server,提供target存储给客户端挂载使用)和客户段(client,使用服务端提供的target来存放文件等),Centos6.8下对应的agent为scsi-target-utils(服务端安装)和iscsi-initiator(客户端安装),以下的安装,全部是用虚拟机安装的。

我们在搭建RAC的时候会用到iscsi来构建共享存储,下面就介绍利用iscsi 怎样构建RAC的共享存储.

1. 环境信息

rac1:192.168.180.2

rac2:192.168.180.3

这里我们选rac1为iscsi服务器,然后把其上的磁盘共享给rac2使用

注意:这里我们可以选用这个2个节点任何一台或者其他机器作为iscsi服务器,这里为了方便就在rac1上搭建iscsi服务器

首先我们在rac1上添加需要共享的磁盘,也就是rac的磁盘组。这里我已经在rac1上分配了6块盘,说明如下:

Ocrvotedisk 3块 4G

Data            2块 50G

FRA_ARC   1 块 60G

Oracle之利用iscsi构建RAC共享存储测试_第1张图片

在rac1上查看:

[root@rac1 ~]# fdisk -l

 

Disk /dev/sda: 64.4 GB,64424509440 bytes

255 heads, 63sectors/track, 7832 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:0x0000d707

 

   Device Boot      Start         End      Blocks  Id  System

/dev/sda1               1        5222   41943040   83  Linux

/dev/sda2   *       5222        6528    10485760  83  Linux

/dev/sda3            6528        7293    6144000   82  Linux swap / Solaris

Disk /dev/sdb: 4294 MB,4294967296 bytes

255 heads, 63sectors/track, 522 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:0x00000000

Disk /dev/sdd: 4294 MB,4294967296 bytes

255 heads, 63sectors/track, 522 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:0x00000000

Disk /dev/sde: 53.7 GB,53687091200 bytes

255 heads, 63sectors/track, 6527 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:0x00000000

Disk /dev/sdf: 53.7 GB,53687091200 bytes

255 heads, 63sectors/track, 6527 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:0x00000000

Disk /dev/sdg: 64.4 GB,64424509440 bytes

255 heads, 63sectors/track, 7832 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:0x00000000

Disk /dev/sdc: 4294 MB,4294967296 bytes

255 heads, 63sectors/track, 522 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:0x00000000

以上说明磁盘已经在rac1上挂载上,下面就利用iscsi 共享给rac2

2.配置iscsi服务端(在rac1上操作)

a)安装scsi-target-utils

[root@rac1 os]# ll scsi-target-utils-1.0.24-18.el6.x86_64.rpm

[root@rac1 os]# rpm -ivh scsi-target-utils-1.0.24-18.el6.x86_64.rpm


注意:在安装的时候有可能提示缺少依赖包,先将这些依赖包安装上以后就可以了

b)配置targets.conf

[root@rac1 os]# vi /etc/tgt/targets.conf

Oracle之利用iscsi构建RAC共享存储测试_第2张图片

注意:里面添加的就是想要共享给rac2的磁盘

c)启动tgtd

[root@rac1 os]# servicetgtd start

Starting SCSI targetdaemon:                              [  OK  ]

[root@rac1 os]# chkconfigtgtd on   

 

3.配置iscsi客户端(在rac2上操作)

a)安装iscsi-initiator-utils

[root@rac2 Packages]# ll iscsi-initiator-utils-6.2.0.873-21.el6.x86_64.rpm

-r--r--r-- 3 root root747940 May 12  2016iscsi-initiator-utils-6.2.0.873-21.el6.x86_64.rpm

[root@rac2 Packages]# rpm -ivh iscsi-initiator-utils-6.2.0.873-21.el6.x86_64.rpm

b)配置nitiatorname.iscsi

[root@rac2 Packages]# vi /etc/iscsi/initiatorname.iscsi

Oracle之利用iscsi构建RAC共享存储测试_第3张图片

注意:红框中的值就是rac1上 /etc/tgt/targets.conf 里配置的值

c)启动iscsi

[root@rac2 Packages]#service iscsi start

[root@rac2 Packages]#chkconfig iscsi on

注意:如果我安装操作系统时已经安装了iscsi-initiator-utils软件包所以不用再另外安装,直接配置就行。

4.共享存储(rac2上操作)

a)通过3260端口查看开放了哪些共享存储:
[root@rac2 ~]#  iscsiadm -m discovery -tsendtargets -p 192.168.180.2:3260

192.168.180.2:3260,1 iqn.2008-09.com.example:server.target4

[root@rac2 ~]# iscsiadm -m node -T discovery -T iqn.2008-09.com.example:server.target4 -p 192.168.180.2:3260


b)登录共享存储:
# iscsiadm -m node -T iqn.2008-09.com.example:server.target4 -p 192.168.180.2:3260 -l

c)探测下共享存储的目录:
# partprobe
# fdisk -l

d)退出共享存储目录:
# iscsiadm -m node -T iqn.2008-09.com.example:server.target4 -p 192.168.1.251:3260  -u
# fdisk -l (
将查看不到共享目录)

e)删除共享存储目录:
# service iscsi restart
# iscsiadm -m node -T iqn.2008-09.com.example:server.target4  -p 192.168.0.13:3260 -u
# iscsiadm -m node -T iqn.2008-09.com.example:server.target4  -p 192.168.0.13:3260 -o delete

f)重新服务并重新创建登录:

# service iscsi restart
# iscsiadm -m discovery -t sendtargets -p 192.168.180.2:3260
# iscsiadm -m node -T iqn.2008-09.com.example:server.target4 -p 192.168.0.13:3260  -l

g)为共享存储分区创建目录

# fdisk -l   我们发现多了一个sdb

然后就是给这个虚拟硬盘sdb分区,然后挂载

#fdisk /dev/sdb

Command (m for help): 在这里按m,就会输出帮助;
Command action
   a toggle a bootable flag
   b edit bsd disklabel
   c toggle the dos compatibility flag
   d delete a partition 注:这是删除一个分区的动作;
   l list known partition types 注:l是列出分区类型,以供我们设置相应分区的类型;
   m print this menu 注:m 是列出帮助信息;
   n add a new partition 注:添加一个分区;
   o create a new empty DOS partition table
   p print the partition table 注:p列出分区表;
   q quit without saving changes 注:不保存退出;
   s create a new empty Sun disklabel
   t change a partition's system id 注:t 改变分区类型;
   u change display/entry units
   v verify the partition table
   w write table to disk and exit 注:把分区表写入硬盘并退出;
   x extra functionality (experts only) 注:扩展应用,专家功能;

# partprobe
# mkfs -t ext3 /dev/sdb1
这一步如果硬盘容量大的话可能会非常慢,时间比较长

# mkdir /mnt/class
# echo "/dev/sdb1 /mnt/class ext3 _netdev 0 0">>/etc/fstab
# mount /mnt/class
# dd if=/dev/zero f=myfile bs=1M count=10    
(创建成功,可以使用)

 

h)卸载共享存储:
# umount /mnt/class/
# rmdir /mnt/class/
# iscsiadm -m node -T iqn.2008-09.com.example:server.target4:disk1 -p 192.168.0.13:3260 –u
# iscsiadm -m node -T iqn.2008-09.com.example:server.target4:disk1 -p 192.168.0.13:3260 -o delete
# service iscsi stop
# chkconfig iscsi off

*******************************************客户端配置结束****************************************

 

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