iscsi部署网络存储

OS VERSION:redhat 7

服务端配置

存储资源准备

fdisk -l

Disk /dev/vdb: 10.7 GB, 10737418240 bytes, 20971520 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x86e972ea

   Device Boot      Start         End      Blocks   Id  System
/dev/vdb1            2048     2099199     1048576   83  Linux
/dev/vdb2         2099200     4196351     1048576   83  Linux
/dev/vdb3         4196352     6293503     1048576   83  Linux
/dev/vdb4         6293504    20971519     7339008    5  Extended
/dev/vdb5         6295552     8392703     1048576   83  Linux

使用mdadm创建raid5

[root@server0 samba]# mdadm -Cv /dev/md0 -n 3 -l 5 -x 1 /dev/vdb1 /dev/vdb2 /dev/vdb3 /dev/vdb5
mdadm: layout defaults to left-symmetric
mdadm: layout defaults to left-symmetric
mdadm: chunk size defaults to 512K
mdadm: size set to 1047552K
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.
[root@desktop0 samba]# 

 

[root@server0 ~]# pvcreate /dev/md0
  Physical volume "/dev/md0" successfully created
[root@server0 ~]# vgcreate vg /dev/md0
  Volume group "vg" successfully created
[root@server0 ~]# lvcreate -L 1G -n /dev/vg/lv
  Logical volume "lv" created
[root@server0 ~]# 

ISCSI技术在工作形式上分为服务端（target）与客户端（initiator）。ISCSI服务端是用于存放硬盘存储资源的服务器，它作为上面创建的RAID磁盘阵列的存储端，能够为用户提供可用的存储资源。ISCSI客户端则是用户使用的软件，用于访问远程服务端的存储资源。

1、服务端安装软件包

[root@server0 ~]# yum install targetd targetcli

开机启动服务

[root@server0 ~]# systemctl enable targetd
ln -s '/usr/lib/systemd/system/targetd.service' '/etc/systemd/system/multi-user.target.wants/targetd.service'

2、配置ISCSI服务端共享资源，/backstores/block是ISCSI服务端配置共享设备的位置

[root@server0 ~]# targetcli
Warning: Could not load preferences file /root/.targetcli/prefs.bin.
targetcli shell version 2.1.fb34
Copyright 2011-2013 by Datera, Inc and others.
For help on commands, type 'help'.

/> ls
o- / ......................................................................................................................... [...]
  o- backstores .............................................................................................................. [...]
  | o- block .................................................................................................. [Storage Objects: 0]
  | o- fileio ................................................................................................. [Storage Objects: 0]
  | o- pscsi .................................................................................................. [Storage Objects: 0]
  | o- ramdisk ................................................................................................ [Storage Objects: 0]
  o- iscsi ............................................................................................................ [Targets: 0]
  o- loopback .....................................................................