一.简介
iSCSI（internet SCSI）技术由IBM公司研究开发，是一个供硬件设备使用的、可以在IP协议的上层运行的SCSI指令集，这种指令集合可以实现在IP网络上运行SCSI协议，使其能够在诸如高速千兆以太网上进行路由选择。iSCSI技术是一种新储存技术，该技术是将现有SCSI接口与以太网络(Ethernet)技术结合，使服务器可与使用IP网络的储存装置互相交换资料。
iSCSI是一种基于TCP/IP 的协议，用来建立和管理IP存储设备、主机和客户机等之间的相互连接，并创建存储区域网络（SAN）。SAN 使得SCSI 协议应用于高速数据传输网络成为可能，这种传输以数据块级别（block-level）在多个数据存储网络间进行。SCSI 结构基于C/S模式，其通常应用环境是：设备互相靠近，并且这些设备由SCSI 总线连接。
iSCSI 的主要功能是在TCP/IP 网络上的主机系统（启动器 initiator）和存储设备（目标器 target）之间进行大量数据的封装和可靠传输过程。iSCSI可分享的设备类型有很多，包括镜像文件（*.img）、分区（partition）、物理硬盘、raid设备、逻辑卷等。
二.实验
1. ISCSI 服务端： 172.16.97.136
ISCSI 客户端： 172.16.97.138
2. 关闭Selinux，打开防火墙端口
[root@localhost ~]# setenforce 0 [root@localhost ~]# firewall-cmd --permanent --add-port=3260/tcp success [root@localhost ~]# firewall-cmd --reload success
3. 查看服务端系统磁盘信息，并创建LVM,使用LVM管理便于磁盘的扩展
#查看硬盘配置
[root@localhost ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 8G 0 disk ├─sda1 8:1 0 1G 0 part /boot └─sda2 8:2 0 7G 0 part ├─centos-root 253:0 0 6.2G 0 lvm / └─centos-swap 253:1 0 820M 0 lvm [SWAP] sdb 8:16 0 8G 0 disk sdc 8:32 0 8G 0 disk sdd 8:48 0 8G 0 disk sde 8:64 0 8G 0 disk sr0 11:0 1 1024M 0 rom #格式化物理磁盘为PV
[root@localhost ~]# pvcreate /dev/sdb Physical volume "/dev/sdb" successfully created. [root@localhost ~]# pvs PV VG Fmt Attr PSize PFree /dev/sda2 centos lvm2 a-- <7.00g 0 /dev/sdb lvm2 --- 8.00g 8.00g
#创建VG [root@localhost ~]# vgcreate linux-pv /dev/sdb Volume group "linux-pv" successfully created [root@localhost ~]# vgs VG #PV #LV #SN Attr VSize VFree centos 1 2 0 wz--n- <7.00g 0 linux-pv 1 0 0 wz--n- <8.00g <8.00g
#创建逻辑卷 [root@localhost ~]# lvcreate -n share-lv -L 4G linux-pv Logical volume "share-lv" created. [root@localhost ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert root centos -wi-ao---- <6.20g swap centos -wi-ao---- 820.00m share-lv linux-pv -wi-a----- 4.00g [root@localhost ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 8G 0 disk ├─sda1 8:1 0 1G 0 part /boot └─sda2 8:2 0 7G 0 part ├─centos-root 253:0 0 6.2G 0 lvm / └─centos-swap 253:1 0 820M 0 lvm [SWAP] sdb 8:16 0 8G 0 disk └─linux--pv-share--lv 253:2 0 4G 0 lvm sdc 8:32 0 8G 0 disk sdd 8:48 0 8G 0 disk sde 8:64 0 8G 0 disk sr0 11:0 1 1024M 0 rom
4. 服务端安装配置iSCSI
#安装target服务
[root@localhost ~]# yum -y install targetd targetcli
[root@localhost ~]# systemctl start targetd
[root@localhost ~]# systemctl enable targetd
Created symlink from /etc/systemd/system/multi-user.target.wants/targetd.service to /usr/lib/systemd/system/targetd.service.
#创建target
[root@localhost ~]# targetcli Warning: Could not load preferences file /root/.targetcli/prefs.bin. targetcli shell version 2.1.fb46 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 ......................................................................................................... [Targets: 0]
#创建块设备 /> cd backstores/ /backstores> cd block /backstores/block> create dev= name= readonly= wwn= /backstores/block> create share-disk /dev/linux-pv/share-lv Created block storage object share-disk using /dev/linux-pv/share-lv. /backstores/block> ls o- block ...................................................................................................... [Storage Objects: 1] o- share-disk ........................................................... [/dev/linux-pv/share-lv (4.0GiB) write-thru deactivated] o- alua ....................................................................................................... [ALUA Groups: 1] o- default_tg_pt_gp ........................................................................... [ALUA state: Active/optimized] /backstores/block> cd .. /backstores> ls o- backstores ................................................................................................................ [...] o- block .................................................................................................... [Storage Objects: 1] | o- share-disk ......................................................... [/dev/linux-pv/share-lv (4.0GiB) write-thru deactivated] | o- alua ..................................................................................................... [ALUA Groups: 1] | o- default_tg_pt_gp ......................................................................... [ALUA state: Active/optimized] o- fileio ................................................................................................... [Storage Objects: 0] o- pscsi .................................................................................................... [Storage Objects: 0] o- ramdisk .................................................................................................. [Storage Objects: 0] /backstores> cd.. /> ls o- / ......................................................................................................................... [...] o- backstores .............................................................................................................. [...] | o- block .................................................................................................. [Storage Objects: 1] | | o- share-disk ....................................................... [/dev/linux-pv/share-lv (4.0GiB) write-thru deactivated] | | o- alua ................................................................................................... [ALUA Groups: 1] | | o- default_tg_pt_gp ....................................................................... [ALUA state: Active/optimized] | o- fileio ................................................................................................. [Storage Objects: 0] | o- pscsi .................................................................................................. [Storage Objects: 0] | o- ramdisk ................................................................................................ [Storage Objects: 0] o- iscsi ............................................................................................................ [Targets: 0] o- loopback ......................................................................................................... [Targets: 0] /> cd iscsi /iscsi> ls o- iscsi .............................................................................................................. [Targets: 0] /iscsi> create iqn.2019-05.com.share-disk:server Created target iqn.2019-05.com.share-disk:server. Created TPG 1. Global pref auto_add_default_portal=true Created default portal listening on all IPs (0.0.0.0), port 3260. /iscsi> ls o- iscsi .............................................................................................................. [Targets: 1] o- iqn.2019-05.com.share-disk:server ................................................................................... [TPGs: 1] o- tpg1 ................................................................................................. [no-gen-acls, no-auth] o- acls ............................................................................................................ [ACLs: 0] o- luns ............................................................................................................ [LUNs: 0] o- portals ...................................................................................................... [Portals: 1] o- 0.0.0.0:3260 ....................................................................................................... [OK] /iscsi> cd iqn.2019-05.com.share-disk:server/ /iscsi/iqn.20...e-disk:server> tpg1/ /iscsi/iqn.20...k:server/tpg1> ls o- tpg1 ..................................................................................................... [no-gen-acls, no-auth] o- acls ................................................................................................................ [ACLs: 0] o- luns ................................................................................................................ [LUNs: 0] o- portals .......................................................................................................... [Portals: 1] o- 0.0.0.0:3260 ........................................................................................................... [OK]
#创建卷 /iscsi/iqn.20...k:server/tpg1> cd luns /iscsi/iqn.20...ver/tpg1/luns> ls o- luns .................................................................................................................. [LUNs: 0] /iscsi/iqn.20...ver/tpg1/luns> cd .. /iscsi/iqn.20...k:server/tpg1> ls o- tpg1 ..................................................................................................... [no-gen-acls, no-auth] o- acls ................................................................................................................ [ACLs: 0] o- luns ................................................................................................................ [LUNs: 0] o- portals .......................................................................................................... [Portals: 1] o- 0.0.0.0:3260 ........................................................................................................... [OK]
#创建ACL /iscsi/iqn.20...k:server/tpg1> cd acls /iscsi/iqn.20...ver/tpg1/acls> ls o- acls .................................................................................................................. [ACLs: 0] /iscsi/iqn.20...ver/tpg1/acls> create iqn.2019-05.com.share-disk:client Created Node ACL for iqn.2019-05.com.share-disk:client /iscsi/iqn.20...ver/tpg1/acls> cd .. /iscsi/iqn.20...k:server/tpg1> ls o- tpg1 ..................................................................................................... [no-gen-acls, no-auth] o- acls ................................................................................................................ [ACLs: 1] | o- iqn.2019-05.com.share-disk:client .......................................................................... [Mapped LUNs: 0] o- luns ................................................................................................................ [LUNs: 0] o- portals .......................................................................................................... [Portals: 1] o- 0.0.0.0:3260 ........................................................................................................... [OK] /iscsi/iqn.20...k:server/tpg1> cd luns /iscsi/iqn.20...ver/tpg1/luns> create /backstores/block/share-disk Created LUN 0. Created LUN 0->0 mapping in node ACL iqn.2019-05.com.share-disk:client /iscsi/iqn.20...ver/tpg1/luns> ls o- luns .................................................................................................................. [LUNs: 1] o- lun0 ........................................................... [block/share-disk (/dev/linux-pv/share-lv) (default_tg_pt_gp)] /iscsi/iqn.20...ver/tpg1/luns> cd .. /iscsi/iqn.20...k:server/tpg1> cd portals/ /iscsi/iqn.20.../tpg1/portals> ls o- portals ............................................................................................................ [Portals: 1] o- 0.0.0.0:3260 ............................................................................................................. [OK] /iscsi/iqn.20.../tpg1/portals> delete 0.0.0.0 3260 Deleted network portal 0.0.0.0:3260 /iscsi/iqn.20.../tpg1/portals> create 172.16.97.61 3260 Using default IP port 3260 Created network portal 172.16.97.61:3260. /iscsi/iqn.20.../tpg1/portals> ls o- portals ............................................................................................................ [Portals: 1] o- 172.16.97.61:3260 ........................................................................................................ [OK] /iscsi/iqn.20.../tpg1/portals> cd / /> ls o- / ......................................................................................................................... [...] o- backstores .............................................................................................................. [...] | o- block .................................................................................................. [Storage Objects: 1] | | o- share-disk ......................................................... [/dev/linux-pv/share-lv (4.0GiB) write-thru activated] | | o- alua ................................................................................................... [ALUA Groups: 1] | | o- default_tg_pt_gp ....................................................................... [ALUA state: Active/optimized] | o- fileio ................................................................................................. [Storage Objects: 0] | o- pscsi .................................................................................................. [Storage Objects: 0] | o- ramdisk ................................................................................................ [Storage Objects: 0] o- iscsi ............................................................................................................ [Targets: 1] | o- iqn.2019-05.com.share-disk:server ................................................................................. [TPGs: 1] | o- tpg1 ............................................................................................... [no-gen-acls, no-auth] | o- acls .......................................................................................................... [ACLs: 1] | | o- iqn.2019-05.com.share-disk:client .................................................................... [Mapped LUNs: 1] | | o- mapped_lun0 ............................................................................ [lun0 block/share-disk (rw)] | o- luns .......................................................................................................... [LUNs: 1] | | o- lun0 ................................................... [block/share-disk (/dev/linux-pv/share-lv) (default_tg_pt_gp)] | o- portals .................................................................................................... [Portals: 1] | o- 172.16.97.61:3260 ................................................................................................ [OK] o- loopback ......................................................................................................... [Targets: 0] /> saveconfig
/> exit
[root@localhost ~]# systemctl restart targetd
5.ISCSI客户端配置
[root@localhost ~]#yum -y install iscsi-initiator-utils
# 修改/etc/iscsi/initiatorname.iscsi文件
[root@iscsi-client ~]# vim /etc/iscsi/initiatorname.iscsi iqn.2019-05.com.share-disk:client
# 启动服务
[root@iscsi-client ~]# systemctl start iscsid
[root@iscsi-client ~]# systemctl enable iscsid
# 挂载192.168.1.157，挂载之前必须要发现该iscsi [root@iscsi-client ~]# iscsiadm -m discovery -t st -p 192.168.1.157 iqn.2019-05.com.share-disk:server
[root@iscsi-client ~]# iscsiadm -m node -T iqn.2019-05.com.share-disk:server -p 192.168.1.157 -l
# 挂载192.168.1.158，挂载之前必须要发现该iscsi
[root@iscsi-client ~]# iscsiadm -m discovery -t st -p 192.168.1.158 192.168.1.158:3260,1
iqn.2019-05.com.share-disk:server
[root@iscsi-client ~]# iscsiadm -m node -T iqn.2019-05.com.share-disk:server -p 192.168.1.158 -l
#查看 [root@iscsi-client ~]# lsblk