ISCSI共享存储配置跟parted命令简述

ISCSI 术语IQN： ISCSI合格名称,格式：iqn.YYYY-MM.com.clovem.www:stro_name ==>主机名倒着写Target：ISCSI存储服务器Initiator：使用Target的节点，前端节点Node：ISCSI存储服务器或者前端节点Portal：ISCSI的访问入口，ISCSI存储的端口

ISCSI Target： node4
1.安装scsi-target-utils //服务端程序

[root@node4 ~]# yum  install scsi-target-utils -y
[root@node4 ~]# vgs
VG    #PV #LV #SN Attr   VSize VFree
vgsrv   1   3   0 wz--n- 8.78g 4.69g
[root@node4 ~]# lvcreate  -L 1GB  -n  lv0   vgsrv
Logical volume "lv0" created
[root@node4 ~]# lvs
LV   VG    Attr   LSize   Origin Snap%  Move Log Copy%  Convert
home vgsrv -wi-ao 256.00m
lv0  vgsrv -wi-a-   1.00g
root vgsrv -wi-ao   3.31g
swap vgsrv -wi-ao 544.00m
[root@node4 ~]# ls /dev/vgsrv/lv0
/dev/vgsrv/lv0

2.编辑 /etc/tgt/targets.conf,复制38-40行，粘贴如下
[root@node4 ~]# vi /etc/tgt/targets.conf

<target iqn.2008-09.com.clovem:target1>
backing-store /dev/vgsrv/lv0
</target>

3. 启动tgtd服务，查看设备是否被导出

[root@node4 ~]# service tgtd start
Starting SCSI target daemon:                               [  OK  ]
[root@node4 ~]# tgt-admin  --show
Target 1: iqn.2013-05.com.clovem:target1
System information:
Driver: iscsi
State: ready
I_T nexus information:
LUN information:
LUN: 0
Type: controller
SCSI ID: IET     00010000
SCSI SN: beaf10
Size: 0 MB, Block size: 1
Online: Yes
Removable media: No
Readonly: No
Backing store type: null
Backing store path: None
Backing store flags:
LUN: 1
Type: disk
SCSI ID: IET     00010001
SCSI SN: beaf11
Size: 1074 MB, Block size: 512
Online: Yes
Removable media: No
Readonly: No
Backing store type: rdwr
Backing store path: /dev/vgsrv/lv0
Backing store flags:
Account information:
ACL information:
ALL

4.查看Target1后面的LUN:1是我们导出的设备：/dev/vgsrv/lv0

ISCSI Initiator:desktop26

[root@desktop26 ~]# rpm -q iscsi-initiator-utils
iscsi-initiator-utils-6.2.0.872-34.el6.x86_64
[root@desktop26 ~]# which iscsiadm
/sbin/iscsiadm

1.启用发现并登录

[root@desktop26 ~]# ls /dev/sd*
/dev/sda  /dev/sda1  /dev/sda2  /dev/sda3
[root@desktop26 ~]# iscsiadm  -m discovery -t sendtargets  -p 172.18.26.4:3260
172.18.26.4:3260,1 iqn.2013-05.com.clovem:target1
[root@desktop26 ~]# iscsiadm  -m node -T iqn.2013-05.com.clovem:target1 -l
Logging in to [iface: default, target: iqn.2013-05.com.clovem:target1, portal: 172.18.26.4,3260] (multiple)
Login to [iface: default, target: iqn.2013-05.com.clovem:target1, portal: 172.18.26.4,3260] successful.
[root@desktop26 ~]# ls /dev/sd*
/dev/sda  /dev/sda1  /dev/sda2  /dev/sda3  /dev/sdb
[root@desktop26 ~]# ls /dev/disk/by-path/
ip-172.18.26.4:3260-iscsi-iqn.2013-05.com.clovem:target1-lun-1  pci-0000:00:07.1-scsi-1:0:1:0-part1
pci-0000:00:07.1-scsi-1:0:0:0                                   pci-0000:00:07.1-scsi-1:0:1:0-part2
pci-0000:00:07.1-scsi-1:0:1:0                                   pci-0000:00:07.1-scsi-1:0:1:0-part3

2. 通过iscsiadm命令查看是否导入成功

[root@desktop26 ~]# iscsiadm  -m session  -P1
Target: iqn.2013-05.com.clovem:target1
Current Portal: 172.18.26.4:3260,1
Persistent Portal: 172.18.26.4:3260,1
**********
Interface:
**********
Iface Name: default
Iface Transport: tcp
Iface Initiatorname: iqn.1994-05.com.redhat:59585542a2c
Iface IPaddress: 172.18.26.254
Iface HWaddress: <empty>
Iface Netdev: <empty>
SID: 2
iSCSI Connection State: LOGGED IN
iSCSI Session State: LOGGED_IN
Internal iscsid Session State: NO CHANGE

3.修改Initiator端名，尽量做在发现跟登入前

[root@desktop26 ~]# cat /etc/iscsi/initiatorname.iscsi
InitiatorName=iqn.2013-05.com.clovem:node1
[root@desktop26 ~]# iscsiadm  -m node -T iqn.2013-05.com.clovem:target1 -u
Logging out of session [sid: 10, target: iqn.2013-05.com.clovem:target1, portal: 172.18.26.4,3260]
Logout of [sid: 10, target: iqn.2013-05.com.clovem:target1, portal: 172.18.26.4,3260] successful.
[root@desktop26 ~]# service iscsid stop
Stopping iscsid:
[root@desktop26 ~]# iscsiadm  -m discovery -t sendtargets  -p 172.18.26.4:3260
Starting iscsid:                                           [  OK  ]
172.18.26.4:3260,1 iqn.2013-05.com.clovem:target1
[root@desktop26 ~]# iscsiadm  -m node -T iqn.2013-05.com.clovem:target1 -l
Logging in to [iface: default, target: iqn.2013-05.com.clovem:target1, portal: 172.18.26.4,3260] (multiple)
Login to [iface: default, target: iqn.2013-05.com.clovem:target1, portal: 172.18.26.4,3260] successful.
[root@desktop26 ~]# iscsiadm  -m session -P1
Target: iqn.2013-05.com.clovem:target1
Current Portal: 172.18.26.4:3260,1
Persistent Portal: 172.18.26.4:3260,1
**********
Interface:
**********
Iface Name: default
Iface Transport: tcp
Iface Initiatorname: iqn.2013-05.com.clovem:node1
Iface IPaddress: 172.18.26.254
Iface HWaddress: <empty>
Iface Netdev: <empty>
SID: 11
iSCSI Connection State: LOGGED IN
iSCSI Session State: LOGGED_IN
Internal iscsid Session State: NO CHANGE

现在可以看到Iface Initiatorname: iqn.2013-05.com.clovem:node1 ，修改成功，一般情况下面在导入设备之前就修改客户端设备名。

回到node4中查看状态，可以看到客户端设备名了

[root@node4 ~]# tgt-admin  --show
Target 1: iqn.2013-05.com.clovem:target1
System information:
Driver: iscsi
State: ready
I_T nexus information:
I_T nexus: 11
Initiator: iqn.2013-05.com.clovem:node1
Connection: 0
IP Address: 172.18.26.254
LUN information:
LUN: 0
Type: controller
SCSI ID: IET     00010000
SCSI SN: beaf10
Size: 0 MB, Block size: 1
Online: Yes
Removable media: No
Readonly: No
Backing store type: null
Backing store path: None
Backing store flags:
LUN: 1
Type: disk
SCSI ID: IET     00010001
SCSI SN: beaf11
Size: 1074 MB, Block size: 512
Online: Yes
Removable media: No
Readonly: No
Backing store type: rdwr
Backing store path: /dev/vgsrv/lv0
Backing store flags:
Account information:
ACL information:
ALL

定义服务端导出设备属性以及访问控制，修改/etc/tgt/target.conf

<target iqn.2013-05.com.clovem:target1>
< backing-store /dev/vgsrv/lv0>
vendor-id       clovemfong, Inc.
scsi_id         target1
scsi_sn         s01
</backing-store>
initiator-address       172.18.26.254
</target>

重新加载配置文件：service tgtd force-reload //由于当前有客户端登入，需要强制重载配置文

[root@node4 ~]# tgt-admin  --show
Target 1: iqn.2013-05.com.clovem:target1
System information:
Driver: iscsi
State: ready
I_T nexus information:
I_T nexus: 1
Initiator: iqn.2013-05.com.clovem:node1
Connection: 0
IP Address: 172.18.26.254
LUN information:
LUN: 0
Type: controller
SCSI ID: IET     00010000
SCSI SN: beaf10
Size: 0 MB, Block size: 1
Online: Yes
Removable media: No
Readonly: No
Backing store type: null
Backing store path: None
Backing store flags:
LUN: 1
Type: disk
SCSI ID: target1
SCSI SN: s01
Size: 1074 MB, Block size: 512
Online: Yes
Removable media: No
Readonly: No
Backing store type: rdwr
Backing store path: /dev/vgsrv/lv0
Backing store flags:
Account information:
ACL information:
172.18.26.254

如果ISCSI存储设备容量>=2TB,就不能够使用常规的fdisk 命令进行磁盘的分区了(其分区表格式为msdos)，需要使用parted，其分区表格式为GPT
命令：
parted /dev/sdb print //查看分区
parted /dev/sdb mklabel gpt //转换格式(msdos gpt)
parted /dev/sdb mkpart primary 1m 100m //创建起始大小为1M，结束为100M的名为primary的分区
分区改名：
parted /dev/sdb name 2 ' "Linux FileSystem" ' //对2号分区改名

parted -s /dev/sdb mkfs 1 ext4 //将1号分区格式化为ext4文件系统,测试发现不支持ext4如此格式化，仅仅默认支持ext2,所以通过mkfs.ext4命令进行格式化即可。

[root@desktop26 ~]# parted  /dev/sdb mklabel gpt
Warning: The existing disk label on /dev/sdb will be destroyed and all data on this disk will be lost. Do you want to continue?
Yes/No? Yes
Information: You may need to update /etc/fstab.
[root@desktop26 ~]# parted  /dev/sdb mkpart rh436 200m 300m
Information: You may need to update /etc/fstab.
[root@desktop26 ~]# parted  /dev/sdb print
Model: IET VIRTUAL-DISK (scsi)
Disk /dev/sdb: 1074MB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Number  Start  End    Size    File system  Name   Flags
1      200MB  300MB  99.6MB               rh436
[root@desktop26 ~]# mkfs.ext4 /dev/sdb1  > /dev/null  2>&1
[root@desktop26 ~]# parted  /dev/sdb print
Model: IET VIRTUAL-DISK (scsi)
Disk /dev/sdb: 1074MB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Number  Start  End    Size    File system  Name   Flags
1      200MB  300MB  99.6MB  ext4         rh436
[root@desktop26 ~]# mkdir /rh436 ; mount /dev/sdb1  /rh436 ; df -H |grep rh436
/dev/sdb1               97M   5.8M    86M   7% /rh436