RHEL7 或CentOS7配置共享存储--使用iSCSI

环境： RHEL 7.3

1.LVM创建
2.服务端配置
3.客户端配置

1.LVM创建

在RHEL7.3中，对于lvm操作部分与之前RHEL6版本没有区别,还是创建pv，vg，lv的方法，命令参考如下：

pvcreate /dev/sdbvgcreate vg_storage /dev/sdblvcreate -L 1g -n lv_lun1 vg_storagelvcreate -L 1g -n lv_lun2 vg_storagelvcreate -L 1g -n lv_lun3 vg_storagelvcreate -L 40g -n lv_lun4 vg_storagelvcreate -L 10g -n lv_lun5 vg_storagelvcreate -L 10g -n lv_lun6 vg_storagelvcreate -L 10g -n lv_lun7 vg_storagelvcreate -L 16g -n lv_lun8 vg_storage

最终可以看到新建的lv信息：

[root@Storage-B yum.repos.d]# lvs  LV      VG         Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert  home    rhel       -wi-ao---- 23.33g                                                      root    rhel       -wi-ao---- 47.79g                                                      swap    rhel       -wi-ao----  7.88g                                                      lv_lun1 vg_storage -wi-a-----  1.00g                                                      lv_lun2 vg_storage -wi-a-----  1.00g                                                      lv_lun3 vg_storage -wi-a-----  1.00g                                                      lv_lun4 vg_storage -wi-a----- 40.00g                                                      lv_lun5 vg_storage -wi-a----- 10.00g                                                      lv_lun6 vg_storage -wi-a----- 10.00g                                                      lv_lun7 vg_storage -wi-a----- 10.00g                                                      lv_lun8 vg_storage -wi-a----- 16.00g

2.服务端配置

之前在RHEL6中安装的iscsi服务端rpm包的名字是：scsi-target-utils，这在RHEL7中变成了targetd、targetcli这两个包。
2.1 使用yum安装targetd和targetcli

yum -y install targetd targetclisystemctl status targetdsystemctl start targetdsystemctl enable targetdsystemctl list-unit-files|grep targetd

同时确认targetd服务启动状态和开启启动。

2.2 使用targetcli创建设备
targetcli进入命令行，cd到/backstores/block 目录下，创建设备：

create disk1 /dev/mapper/vg_storage-lv_lun1create disk2 /dev/mapper/vg_storage-lv_lun2create disk3 /dev/mapper/vg_storage-lv_lun3create disk4 /dev/mapper/vg_storage-lv_lun4create disk5 /dev/mapper/vg_storage-lv_lun5create disk6 /dev/mapper/vg_storage-lv_lun6create disk7 /dev/mapper/vg_storage-lv_lun7create disk8 /dev/mapper/vg_storage-lv_lun8

创建完成，可以成功看到：

/backstores/block> lso- block ...................................................................................................... [Storage Objects: 8]  o- disk1 ........................................................ [/dev/mapper/vg_storage-lv_lun1 (1.0GiB) write-thru deactivated]  o- disk2 ........................................................ [/dev/mapper/vg_storage-lv_lun2 (1.0GiB) write-thru deactivated]  o- disk3 ........................................................ [/dev/mapper/vg_storage-lv_lun3 (1.0GiB) write-thru deactivated]  o- disk4 ....................................................... [/dev/mapper/vg_storage-lv_lun4 (40.0GiB) write-thru deactivated]  o- disk5 ....................................................... [/dev/mapper/vg_storage-lv_lun5 (10.0GiB) write-thru deactivated]  o- disk6 ....................................................... [/dev/mapper/vg_storage-lv_lun6 (10.0GiB) write-thru deactivated]  o- disk7 ....................................................... [/dev/mapper/vg_storage-lv_lun7 (10.0GiB) write-thru deactivated]  o- disk8 ....................................................... [/dev/mapper/vg_storage-lv_lun8 (16.0GiB) write-thru deactivated]

2.3 使用targetcli创建iqn和LUN
然后cd到/iscsi目录下，创建iqn；cd到/iscsi/iqn.20...0be/tpg1/luns下创建LUN，参考命令如下：

cd /iscsicreatecd /iscsi/iqn.20...0be/tpg1/lunscreate /backstores/block/disk1create /backstores/block/disk2create /backstores/block/disk3create /backstores/block/disk4create /backstores/block/disk5create /backstores/block/disk6create /backstores/block/disk7create /backstores/block/disk8

实际执行过程如下：

/backstores/block> cd /iscsi/iscsi> lso- iscsi .............................................................................................................. [Targets: 0]/iscsi> createCreated target iqn.2003-01.org.linux-iscsi.storage-b.x8664:sn.46b1dc2750be.Created TPG 1.Global pref auto_add_default_portal=trueCreated default portal listening on all IPs (0.0.0.0), port 3260./iscsi> lso- iscsi .............................................................................................................. [Targets: 1]  o- iqn.2003-01.org.linux-iscsi.storage-b.x8664:sn.46b1dc2750be ......................................................... [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/iqn.20...0be/tpg1/luns> ls o- luns .................................................................................................................. [LUNs: 8]  o- lun0 ........................................................................... [block/disk1 (/dev/mapper/vg_storage-lv_lun1)]  o- lun1 ........................................................................... [block/disk2 (/dev/mapper/vg_storage-lv_lun2)]  o- lun2 ........................................................................... [block/disk3 (/dev/mapper/vg_storage-lv_lun3)]  o- lun3 ........................................................................... [block/disk4 (/dev/mapper/vg_storage-lv_lun4)]  o- lun4 ........................................................................... [block/disk5 (/dev/mapper/vg_storage-lv_lun5)]  o- lun5 ........................................................................... [block/disk6 (/dev/mapper/vg_storage-lv_lun6)]  o- lun6 ........................................................................... [block/disk7 (/dev/mapper/vg_storage-lv_lun7)]  o- lun7 ........................................................................... [block/disk8 (/dev/mapper/vg_storage-lv_lun8)]/iscsi/iqn.20...0be/tpg1/luns>

2.4 使用targetcli创建acls
cd到acls目录下，创建client；然后cd到portals目录下创建portals, 参考命令如下：

cd /iscsi/iqn.20...0be/tpg1/aclscreate iqn.2003-01.org.linux-iscsi.storage-b.x8664:sn.46b1dc2750be:clientcd /iscsi/iqn.20...0be/tpg1/portalsdelete 0.0.0.0 3260create 10.10.1.21create 10.10.2.21

实际执行过程如下：

/iscsi/iqn.20.../tpg1/portals> pwd/iscsi/iqn.2003-01.org.linux-iscsi.storage-b.x8664:sn.46b1dc2750be/tpg1/portals/iscsi/iqn.20.../tpg1/portals> lso- portals ............................................................................................................ [Portals: 2]  o- 10.10.1.21:3260 .......................................................................................................... [OK]  o- 10.10.2.21:3260 .......................................................................................................... [OK]

2.5 使用targetcli查看当前配置信息
在/下执行ls，或者ls /查看当前配置信息：

/iscsi/iqn.20.../tpg1/portals> ls /o- / ......................................................................................................................... [...]  o- backstores .............................................................................................................. [...]  | o- block .................................................................................................. [Storage Objects: 8]  | | o- disk1 ...................................................... [/dev/mapper/vg_storage-lv_lun1 (1.0GiB) write-thru activated]  | | o- disk2 ...................................................... [/dev/mapper/vg_storage-lv_lun2 (1.0GiB) write-thru activated]  | | o- disk3 ...................................................... [/dev/mapper/vg_storage-lv_lun3 (1.0GiB) write-thru activated]  | | o- disk4 ..................................................... [/dev/mapper/vg_storage-lv_lun4 (40.0GiB) write-thru activated]  | | o- disk5 ..................................................... [/dev/mapper/vg_storage-lv_lun5 (10.0GiB) write-thru activated]  | | o- disk6 ..................................................... [/dev/mapper/vg_storage-lv_lun6 (10.0GiB) write-thru activated]  | | o- disk7 ..................................................... [/dev/mapper/vg_storage-lv_lun7 (10.0GiB) write-thru activated]  | | o- disk8 ..................................................... [/dev/mapper/vg_storage-lv_lun8 (16.0GiB) write-thru activated]  | o- fileio ................................................................................................. [Storage Objects: 0]  | o- pscsi .................................................................................................. [Storage Objects: 0]  | o- ramdisk ................................................................................................ [Storage Objects: 0]  o- iscsi ............................................................................................................ [Targets: 1]  | o- iqn.2003-01.org.linux-iscsi.storage-b.x8664:sn.46b1dc2750be ....................................................... [TPGs: 1]  |   o- tpg1 ............................................................................................... [no-gen-acls, no-auth]  |     o- acls .......................................................................................................... [ACLs: 1]  |     | o- iqn.2003-01.org.linux-iscsi.storage-b.x8664:sn.46b1dc2750be:client ................................... [Mapped LUNs: 8]  |     |   o- mapped_lun0 ................................................................................. [lun0 block/disk1 (rw)]  |     |   o- mapped_lun1 ................................................................................. [lun1 block/disk2 (rw)]  |     |   o- mapped_lun2 ................................................................................. [lun2 block/disk3 (rw)]  |     |   o- mapped_lun3 ................................................................................. [lun3 block/disk4 (rw)]  |     |   o- mapped_lun4 ................................................................................. [lun4 block/disk5 (rw)]  |     |   o- mapped_lun5 ................................................................................. [lun5 block/disk6 (rw)]  |     |   o- mapped_lun6 ................................................................................. [lun6 block/disk7 (rw)]  |     |   o- mapped_lun7 ................................................................................. [lun7 block/disk8 (rw)]  |     o- luns .......................................................................................................... [LUNs: 8]  |     | o- lun0 ................................................................... [block/disk1 (/dev/mapper/vg_storage-lv_lun1)]  |     | o- lun1 ................................................................... [block/disk2 (/dev/mapper/vg_storage-lv_lun2)]  |     | o- lun2 ................................................................... [block/disk3 (/dev/mapper/vg_storage-lv_lun3)]  |     | o- lun3 ................................................................... [block/disk4 (/dev/mapper/vg_storage-lv_lun4)]  |     | o- lun4 ................................................................... [block/disk5 (/dev/mapper/vg_storage-lv_lun5)]  |     | o- lun5 ................................................................... [block/disk6 (/dev/mapper/vg_storage-lv_lun6)]  |     | o- lun6 ................................................................... [block/disk7 (/dev/mapper/vg_storage-lv_lun7)]  |     | o- lun7 ................................................................... [block/disk8 (/dev/mapper/vg_storage-lv_lun8)]  |     o- portals .................................................................................................... [Portals: 2]  |       o- 10.10.1.21:3260 .................................................................................................. [OK]  |       o- 10.10.2.21:3260 .................................................................................................. [OK]  o- loopback ......................................................................................................... [Targets: 0]/iscsi/iqn.20.../tpg1/portals>

最后配置防火墙策略，或者直接关闭防火墙，建议后者，视具体要求而定。

--防火墙添加放行tcp 3260端口：firewall-cmd --permanent --add-port=3260/tcpfirewall-cmd --reload--关闭防火墙：systemctl disable firewalldsystemctl stop firewalld

3.客户端配置

3.1 使用yum安装iscsi-initiator-utils

yum -y install iscsi-initiator-utils

3.2 编辑/etc/iscsi/initiatorname.iscsi
vi /etc/iscsi/initiatorname.iscsi

#InitiatorName=iqn.1994-05.com.redhat:babc7da33c48InitiatorName=iqn.2003-01.org.linux-iscsi.storage-b.x8664:sn.46b1dc2750be:client

注释之前的示例，添加一行实际的配置。

3.3 使用iscsiadm发现可用存储设备并登陆连接
iscsiadm -m discovery -t st -p 10.10.1.21

[root@db92 yum.repos.d]# iscsiadm -m discovery -t st -p 10.10.1.2110.10.1.21:3260,1 iqn.2003-01.org.linux-iscsi.storage-b.x8664:sn.46b1dc2750be10.10.2.21:3260,1 iqn.2003-01.org.linux-iscsi.storage-b.x8664:sn.46b1dc2750be

登陆连接：

iscsiadm -m node -T iqn.2003-01.org.linux-iscsi.storage-b.x8664:sn.46b1dc2750be -p 10.10.1.21 --loginiscsiadm -m node -T iqn.2003-01.org.linux-iscsi.storage-b.x8664:sn.46b1dc2750be -p 10.10.2.21 --login

此时使用fdisk -l 查看已经正常显示所有设备：

[root@db90 ~]# fdisk -lDisk /dev/sda: 85.9 GB, 85899345920 bytes, 167772160 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk label type: dosDisk identifier: 0x0001b841   Device Boot      Start         End      Blocks   Id  System/dev/sda1   *        2048     2099199     1048576   83  Linux/dev/sda2         2099200   167772159    82836480   8e  Linux LVMDisk /dev/mapper/rhel-root: 51.3 GB, 51308920832 bytes, 100212736 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk /dev/mapper/rhel-swap: 8455 MB, 8455716864 bytes, 16515072 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk /dev/mapper/rhel-home: 25.1 GB, 25052577792 bytes, 48930816 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk /dev/sdb: 1073 MB, 1073741824 bytes, 2097152 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 33550336 bytesDisk /dev/sdc: 1073 MB, 1073741824 bytes, 2097152 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 33550336 bytesDisk /dev/sdd: 1073 MB, 1073741824 bytes, 2097152 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 33550336 bytesDisk /dev/sde: 1073 MB, 1073741824 bytes, 2097152 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 33550336 bytesDisk /dev/sdg: 1073 MB, 1073741824 bytes, 2097152 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 33550336 bytesDisk /dev/sdf: 42.9 GB, 42949672960 bytes, 83886080 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 33550336 bytesDisk /dev/sdh: 1073 MB, 1073741824 bytes, 2097152 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 33550336 bytesDisk /dev/sdi: 10.7 GB, 10737418240 bytes, 20971520 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 33550336 bytesDisk /dev/sdj: 42.9 GB, 42949672960 bytes, 83886080 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 33550336 bytesDisk /dev/sdl: 10.7 GB, 10737418240 bytes, 20971520 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 33550336 bytesDisk /dev/sdk: 10.7 GB, 10737418240 bytes, 20971520 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 33550336 bytesDisk /dev/sdn: 10.7 GB, 10737418240 bytes, 20971520 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 33550336 bytesDisk /dev/sdm: 10.7 GB, 10737418240 bytes, 20971520 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 33550336 bytesDisk /dev/sdo: 10.7 GB, 10737418240 bytes, 20971520 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 33550336 bytesDisk /dev/sdp: 17.2 GB, 17179869184 bytes, 33554432 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 33550336 bytesDisk /dev/sdq: 17.2 GB, 17179869184 bytes, 33554432 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 33550336 bytes[root@db90 ~]#

由于是两条链路，所以fdisk看到的存储LUN是两倍，后续再使用多路径软件聚合即可使用。

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ linux 7.4 版本 iscsi搭建共享存储实战

主机：

10.10.6.83 rac1

10.10.6.84 rac2

---版本

[root@rac1 iscsi]# cat /etc/redhat-release
CentOS Linux release 7.3.1611 (Core)

我在 rac1 主机上划分了一个50G的空间盘，打算用iscsi服务共享给两台主机rac1，rac2 ，下面是操作步骤

1、查看共享存储用的盘

[root@rac1 iscsi]# fdisk -l
Disk /dev/sda: 107.4 GB, 107374182400 bytes, 209715200 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: 0x000e5720
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 411647 204800 83 Linux
/dev/sda2 411648 104857599 52222976 8e Linux LVM
/dev/sda3 104857600 209715199 52428800 5 Extended
/dev/sda5 104859648 209715199 52427776 83 Linux

Disk /dev/mapper/centos-root: 49.2 GB, 49178214400 bytes, 96051200 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 /dev/mapper/centos-swap: 4294 MB, 4294967296 bytes, 8388608 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

这里我用盘/dev/sda5 来做两台主机的共享存储

2、安装iscsi 客户端软件

yum -y installiscsi-initiator-utils

---重启服务

[root@rac2 iscsi]# systemctl restart iscsi

[root@rac2 iscsi]# systemctl enable iscsi

---修改两台主机iscsi客户识别号

[root@rac1 iscsi]# pwd
/etc/iscsi
[root@rac1 iscsi]# ls
initiatorname.iscsi iscsid.conf
[root@rac1 iscsi]# vi initiatorname.iscsi
InitiatorName=iqn.1994-05.com.redhat:rac1

[root@rac2 iscsi]# cat initiatorname.iscsi
InitiatorName=iqn.1994-05.com.redhat:rac2

注意：客户端的 initiator Node Name 配置成与 target ACL 的一致

3、在rac1 主机上建立iscsi 服务

3.1 安装iscsi软件

[root@rac1etc]# yum install targetcli*

3.2 启动 target 服务

systemctl start target

systemctl enable target

3.3 进入管理控制台

[root@rac1etc]# targetcli

3.4 建立一个块储存server1，使用上面新添加硬盘/dev/ sda5

/backstores/block create server1 /dev/sda5

创建完成后，会在 /backstores/block 下面可以看出多了server1

3.5 建立target的id ：

注意： iqn.1994-05.com.redhat:rac1 名称的选取一定要与server1 磁盘所对应的InitiatorName一样，（或者修改initiatorname.iscsi 文件内容）

建立一个名称iqn为iqn.1994-05.com.redhat:rac1

/> cd iscsi

/iscsi>create iqn.1994-05.com.redhat:rac1

3.6 设置哪些设备可以连接到此iqn上:

cd /iscsi/iqn.1994-05.com.redhat:rac1/tpg1/acls

create iqn.1994-05.com.redhat:rac2

create iqn.1994-05.com.redhat:rac1

3.7 lun 和具体的磁盘联系在一起，前面已经把/dev/sda5 磁盘创建成了server1

Cd /iscsi/ iqn.1994-05.com.redhat:rac1/tpg1/luns

Create /backstores/block/server1

3.8 配置 target 监听 IP 和端口（默认在所有接口 IP 的 3260/tcp 监听）

Cd /iscsi/ iqn.1994-05.com.redhat:rac1/tpg1/portals

delete 0.0 . 0.0 3260

Create 10.10.6.83

Create 10.10.6.84

3.9 保存配置

/iscsi/iqn.20.../tpg1/portals>cd /

/>saveconfig

[root@rac1 iscsi]# iscsiadm -m discovery -t st -p 10.10.6.83
10.10.6.83:3260,1 iqn.1994-05.com.redhat:rac1

[root@rac2 iscsi]# cat initiatorname.iscsi
InitiatorName=iqn.1994-05.com.redhat:rac2

4 客户端登陆服务

[root@rac1iscsi]# iscsiadm -m discovery -t st -p 10.10.6.83

10.10.6.83:3260,1iqn.1994-05.com.redhat:rac1

[root@rac1iscsi]# iscsiadm -m node -T iqn.1994-05.com.redhat:rac1 -p 10.10.6.83:3260 -l

Logging in to[iface: default, target: iqn.1994-05.com.redhat:rac1, portal: 10.10.6.83,3260](multiple)

[root@rac2iscsi]# iscsiadm -m discovery -t st -p 10.10.6.83

10.10.6.83:3260,1iqn.1994-05.com.redhat:rac1

[root@rac2iscsi]# iscsiadm -m node -T iqn.1994-05.com.redhat:rac1 -p 10.10.6.83:3260 -l

Logging in to[iface: default, target: iqn.1994-05.com.redhat:rac1, portal: 10.10.6.83,3260](multiple)

[root@rac1 iscsi]# fdisk -l

Disk /dev/sda: 107.4 GB, 107374182400 bytes, 209715200 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: 0x000e5720

Device Boot Start End Blocks Id System
/dev/sda1 * 2048 411647 204800 83 Linux
/dev/sda2 411648 104857599 52222976 8e Linux LVM
/dev/sda3 104857600 209715199 52428800 5 Extended
/dev/sda5 104859648 209715199 52427776 83 Linux

Disk /dev/mapper/centos-root: 49.2 GB, 49178214400 bytes, 96051200 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 /dev/mapper/centos-swap: 4294 MB, 4294967296 bytes, 8388608 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 /dev/sdb: 53.7 GB, 53686042624 bytes, 104855552 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 33550336 bytes

磁盘共享成功

Centos7系列（八）ISCSI网络存储服务

ISCSI 网络存储服务：

说明：iscsi实现网络存储，提供存储端叫 target，使用存储端叫 initiator。target 上可以提供存储空间，initiator负责连接ISCSI设备，在ISCSI设备中创建文件系统，以及存取数据，在 initiator 上看上去是多了一块硬盘。

服务器端配置target，准备做为LUN发布的ISCSI的存储设备（可以是一整块磁盘、一个分区、逻辑卷或RAID阵列）。

虚拟机环境图：

实验步骤（本实验以一整块磁盘做为iscsi存储）：

1 ）事先准备好一块新磁盘作为ISCSI的存储设备

2 ）安装target

3 ）启动target服务

4) 设置防火墙,开启3260端口例外，以便客户端连接

5 ）执行targetcli工具

下面正式开始做iscsi的共享储存：

基本思路：

先把准备共享的块做出来，创建一个target，在target上创建lun，一个lun连接一个块

6 ）创建块即给要发布的存储磁盘起个名字

7 ）创建 iqn名字即创建ISCSI对象

8 ）创建LUN（即逻辑单元）并绑定块

9 ）设置ACL即将ISCSI对象与客户端IP或主机名绑定( initiator 端必须指定ACL的名字才可以连接iscsi存储，就相当于initiator端连接iscsi存储的一个凭证 )

10 ）修改监听地址（把默认的0.0.0.0改成本机的地址）

说明：可以查看 /etc/target/saveconfig.json 配置文件，该配置文件保存着ISCSI的配置。

下面是在initiator端的配置：

1 ）安装iscsi-initiator-utils

2 ）给initiator起一个名字

3 ）启动iscsid服务

4 ）寻找（发现）target端的存储（即查询target端的iscsi对象）

Iscsi 的用法：

5 ）登陆存储（即登陆iscsi对象）

6 ）验证客户端ISCSI连接

7) 格式化、创建挂载点、挂载

RHEL7 或CentOS7配置共享存储--使用iSCSI

1.LVM创建

2.服务端配置

3.客户端配置

Centos7系列（八）ISCSI网络存储服务

更多相关文章

随机推荐