iSCSI

문서의 이전 판입니다!

참조링크 : https://access.redhat.com/solutions/894163

테스트환경
* HOST OS : CentOS 6.6 64bit
* GUEST OS : CentOS 6.6 64bit

tgt-setup-lun : target 을 생성하고 target 을 장치에 추가해 주는 Script 명령어 입니다.

해당 명령어로 실행시 간단하게 iSCSI Target 을 생성 관리 할수 있습니다.

Step.1 iSCSI Target 설치

[root@iscsi ~]# yum install scsi-target-utils.x86_64 -y

[root@iscsi ~]# rpm -qa | grep scsi-target-utils
scsi-target-utils-1.0.24-16.el6.x86_64

Step.2 iSCSI Target 서비스 실행

[root@iscsi ~]# service tgtd start
[root@iscsi ~]# service tgtd status
[root@iscsi ~]# chkconfig tgtd on

Step.3 iSCSI Target 생성

* 디스크 생성 및 LVM 구성은 이곳에서 따로 보여주지 않는다.
* tgt-setup-lun 스크립트 명령어로 아래와 같이 생성해 준다.

[root@iscsi ~]# tgt-setup-lun -d /dev/mapper/VG_DISK1-LV_Disk1 -n iSCSI_Target1
[root@iscsi ~]# tgt-setup-lun -d /dev/mapper/VG_DISK2-LV_Disk2 -n iSCSI_Target2
[root@iscsi ~]# tgt-setup-lun -d /dev/mapper/VG_DISK3-LV_Disk3 -n iSCSI_Target3
[root@iscsi ~]# tgt-setup-lun -d /dev/mapper/VG_DISK4-LV_Disk4 -n iSCSI_Target4

* 생성된 파일을 targets.conf 파일에 입력하기

[root@iscsi ~]#tgt-admin --dump | grep -v default-driver > target.conf
[root@iscsi ~]#vim target.conf
<target iqn.2001-04.com.iscsi-iSCSI_Target3>  // iqn 이름을 현재 날짜 또는 원하는 이름으로 변경한다.
	backing-store /dev/mapper/VG_DISK3-LV_Disk3
</target>

<target iqn.2001-04.com.iscsi-iSCSI_Target1>
	backing-store /dev/mapper/VG_DISK1-LV_Disk1
</target>

<target iqn.2001-04.com.iscsi-iSCSI_Target4>
	backing-store /dev/mapper/VG_DISK4-LV_Disk4
</target>

<target iqn.2001-04.com.iscsi-iSCSI_Target2>
	backing-store /dev/mapper/VG_DISK2-LV_Disk2
</target>

[root@iscsi ~]#

* tgtd 데몬 재 시작


[root@iscsi ~]# service tgtd restart

* Target 확인


[root@iscsi ~]# tgt-admin -s

Target 1: iqn.2015-04.com.iscsi-iSCSI_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
            Prevent removal: 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: 32216 MB, Block size: 512
            Online: Yes
            Removable media: No
            Prevent removal: No
            Readonly: No
            Backing store type: rdwr
            Backing store path: /dev/mapper/VG_DISK1-LV_Disk1
            Backing store flags: 
    Account information:
    ACL information:
        ALL
Target 2: iqn.2015-04.com.iscsi-iSCSI_Target2
    System information:
        Driver: iscsi
        State: ready
    I_T nexus information:
    LUN information:
        LUN: 0
            Type: controller
            SCSI ID: IET     00020000
            SCSI SN: beaf20
            Size: 0 MB, Block size: 1
            Online: Yes
            Removable media: No
            Prevent removal: No
            Readonly: No
            Backing store type: null
            Backing store path: None
            Backing store flags: 
        LUN: 1
            Type: disk
            SCSI ID: IET     00020001
            SCSI SN: beaf21
            Size: 10737 MB, Block size: 512
            Online: Yes
            Removable media: No
            Prevent removal: No
            Readonly: No
            Backing store type: rdwr
            Backing store path: /dev/mapper/VG_DISK2-LV_Disk2
            Backing store flags: 
    Account information:
    ACL information:
        ALL
Target 3: iqn.2015-04.com.iscsi-iSCSI_Target3
    System information:
        Driver: iscsi
        State: ready
    I_T nexus information:
    LUN information:
        LUN: 0
            Type: controller
            SCSI ID: IET     00030000
            SCSI SN: beaf30
            Size: 0 MB, Block size: 1
            Online: Yes
            Removable media: No
            Prevent removal: No
            Readonly: No
            Backing store type: null
            Backing store path: None
            Backing store flags: 
        LUN: 1
            Type: disk
            SCSI ID: IET     00030001
            SCSI SN: beaf31
            Size: 5377 MB, Block size: 512
            Online: Yes
            Removable media: No
            Prevent removal: No
            Readonly: No
            Backing store type: rdwr
            Backing store path: /dev/mapper/VG_DISK3-LV_Disk3
            Backing store flags: 
    Account information:
    ACL information:
        ALL
Target 4: iqn.2015-04.com.iscsi-iSCSI_Target4
    System information:
        Driver: iscsi
        State: ready
    I_T nexus information:
    LUN information:
        LUN: 0
            Type: controller
            SCSI ID: IET     00040000
            SCSI SN: beaf40
            Size: 0 MB, Block size: 1
            Online: Yes
            Removable media: No
            Prevent removal: No
            Readonly: No
            Backing store type: null
            Backing store path: None
            Backing store flags: 
        LUN: 1
            Type: disk
            SCSI ID: IET     00040001
            SCSI SN: beaf41
            Size: 5344 MB, Block size: 512
            Online: Yes
            Removable media: No
            Prevent removal: No
            Readonly: No
            Backing store type: rdwr
            Backing store path: /dev/mapper/VG_DISK4-LV_Disk4
            Backing store flags: 
    Account information:
    ACL information:
        ALL

* target 제거


tgt-admin --delete ALL // 모든 타겟을 지운다.
tgt-admin --delete tid=4 // 타겟4번을 지운다.
tgt-admin --delete iqn.2015-04.com   // 해당 iqn.2015-04.com 타겟을 지운다.

테스트환경
* HOST OS : CentOS Linux release 7
* GUEST OS : CentOS Linux release 7

targetcli 는 트리 기반의 파일 시스템과 유사한 방식으로 탐색한다
targetcli 는 커널의 대상 서스 시스템을 구성하고 저장하기 위한 쉘 스크립트 이다

Step1. Install and run targetcli

이 문서에서는 공유 디스크로 생성한 LVM 볼륨 구성은 작성하지 않았습니다
현재 등록되어 있는 디스크 정보들을 확인한다

[root@server1 ~]# fdisk -l | grep Disk
Disk /dev/sda: 32.2 GB, 32212254720 bytes, 62914560 sectors
Disk /dev/sdb: 53.7 GB, 53687091200 bytes, 104857600 sectors // ISCSI 구성을 위해 신규 추가된 디스크
Disk /dev/mapper/centos-swap: 2164 MB, 2164260864 bytes, 4227072 sectors
Disk /dev/mapper/centos-root: 29.5 GB, 29519511552 bytes, 57655296 sectors

[root@server1 ~]# vgs
  VG             #PV #LV #SN Attr   VSize    VFree
  VG_iscsi_Disk1   1   1   0 wz--n- 1020.00m    0 
  VG_iscsi_Disk2   1   1   0 wz--n-   10.00g    0 
  centos           1   2   0 wz--n-   29.51g    0 
  
[root@server1 ~]# lvs
  LV             VG             Attr       LSize    Pool Origin Data%  Move Log Cpy%Sync Convert
  lv_iscsi_Disk1 VG_iscsi_Disk1 -wi-a----- 1020.00m                                             
  lv_iscsi_Disk2 VG_iscsi_Disk2 -wi-a-----   10.00g                                             
  root           centos         -wi-ao----   27.49g                                             
  swap           centos         -wi-ao----    2.02g

targetcli 설치 및 확인 :

# yum install targetcli

# targetcli --version
/usr/bin/targetcli version 2.1.fb37

* target service 구동 :

# systemctl start target

targetcli 명령어로 쉘 스크립트 실행

[root@server1 ~]# targetcli 
targetcli shell version 2.1.fb37
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]
/>

backstores 구성

# Discover targets at a given IP address:
iscsiadm --mode discoverydb --type sendtargets --portal 192.168.1.10 --discover

#Login, must use a node record id found by the discovery:
iscsiadm --mode node --targetname iqn.2001-05.com.doe:test --portal 192.168.1.1:3260 --login

#Logout:
iscsiadm --mode node --targetname iqn.2001-05.com.doe:test --portal 192.168.1.1:3260 --logout

#List node records:
iscsiadm --mode node

#Display all data for a given node record:
iscsiadm --mode node --targetname iqn.2001-05.com.doe:test --portal 192.168.1.1:3260

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