Configuring iSCSI servers under Linux for resource sharing

ISCSI (Internet SCSI): Enables the sending of SCSI commands from clients over IP to SCSI storage devices on remote servers

The SCSI fabric is based on the client/server model, and the typical application environment is that the devices are close to each other and the devices are connected by a SCSI bus. The main function of ISCSI is toTCP/IPon the networkHost System(initiator initiator) and storage device (target object) for a large amount of data encapsulation andReliable Transmissionprocess. In addition, ISCSI provides encapsulation of SCSI commands on IP networks and runs inTCPon.

Qualified name format: Iqn.yyyy-mm.{reverse Domain}:label

First, the server-side configuration is as follows:

1. Install and start the service

[[email protected] desktop]# Yum install targetcli-y# installing iSCSI target Package [[email protected] desktop]# systemctl start target# startup t arget service [[email protected] desktop]# Systemctl enable target# set up service boot from

2. Enter iSCSI Interactive configuration mode

[[email protected] desktop]# targetcli# Input TARGETCLI command targetcli shell version 2.1. Fb34copyright 2011-2013 by datera, inc and others. for help on commands, type  ' Help ' ./> lso- /  ..... ..... ..... ..... ..... ..... ..... ....  [..... ..... ..... ..... ..... ....... .............   o- backstores .......................................................... [...]   | o- block .............................................. [Storage  objects: 0]  | o- fileio ............................................. [ storage objects: 0]  | o- pscsi  .............................................. [storage objects: 0]  | o-  ramdisk ............................................ [storage objects: 0]  o-  ISCSI&NBSP, ....... .......................................... [targets: 0]  o- loopback  ..................................................... [targets: 0]/> /backstores/block  create pt.example.disk1 /dev/sda4# creating iSCSI Remote Storage blocks using/DEV/SDA4 pt.example.disk1created block  storage object pt.example.disk1 using /dev/sda4./> /iscsi create  iqn.2016-03.pt.example1:storage# Create the iSCSI file name to share (the format must be Iqn.yyyy-mm.{reverse domain}:label) created  Target iqn.2016-03.pt.example1:storage. created tpg 1./> /iscsi/iqn.2016-03.pt.example1:storage/tpg1/acls create  iqn.2016-03.pt.example2:desktop# specifies ACL permissions to access the iSCSI device block (that is, allow Initiator name to Iqn.2016-03.pt.example2: Desktop clients can access) created node acl for iqn.2016-03.pt.example2:desktop/> /iscsi/ iqn.2016-03.pt.example1:storage/tpg1/luns create /backstores/block/pt.example.disk1 # Join the iSCSI Remote Storage block you created created lun 0.created lun 0->0 mapping in node acl iqn.2016-03.pt.example2:desktop/ > /iscsi/iqn.2016-03.pt.example1:storage/tpg1/portals create 172.25.254.209# the port using used to open access  default IP port 3260Created network portal 172.25.254.209:3260./>  Ls# is completed as follows o- / ..................................................................... [...]   o- backstores .......................................................... [...]   | o- block .............................................. [Storage  objects: 1]  | | o- pt.example.disk1 ............ [/dev/sda4  ( 1.0GiB)  write-thru activated]  | o- fileio  ............................................. [storage objects: 0]  | o-  Pscsi .............................................. [storage objects: 0]  | o- ramdisk  .....  [storage objects: 0]  o- iscsi........... ..............-.....  ........................................................ [targets: 1]  | o-  iqn.2016-03.pt.example1:storage ............................... [tpgs: 1]  |    o- tpg1 ........................................... [no-gen-acls,  no-auth]  |     o- acls  ...................................................... [acls: 1]  |      | o- iqn.2016-03.pt.example2:desktop .................. [mapped luns:  1]  |     |   o- mapped_lun0  .................. [lun0 block/pt.example.disk1  (rw)]  |      o- luns ................................................ [luns: 1]  |      | o- lun0 ......................... [block/pt.example.disk1  (/DEV/SDA4)]   |     O- PORTALS&NBSP: ..... ..... ..... ..... ..... ....................  [portals: 1]  |       o- 172.25.254.209:3260  .......................................... [OK]  o- loopback  ..... ...  [targets: 0]/> exitglobal pref. ..... ....... ..... ....... .......--the ......-.......  auto_save_on_exit=truelast 10 configs saved in /etc/target/backup. Configuration saved to /etc/target/saveconfig.json

Set up a firewall

[[email protected] desktop]# firewall-cmd--permanent--add-port=3260/tcp# will be used to join the firewall allowed Success[[email protected] desktop]# Firewall-cmd--reload #重载防火墙的设置success

Second, the client configuration is as follows:

[[email protected] desktop]# yum install iscsi-initiator-utils -y# Install iSCSI Initiator Package [ [email protected] desktop]# vim /etc/iscsi/initiatorname.iscsi# set Initiator's iqninitiatorname= Iqn.2016-03.pt.example2:desktop[[email protected] desktop]# iscsiadm -m discovery  -t st -p 172.25.254.209   #获得可以访问共享的块172 .25.254.209:3260,1  Iqn.2016-03.pt.example1:storage[[email protected] desktop]# iscsiadm -m node -t  iqn.2016-03.pt.example1:storage -p 172.25.254.209 -l# connecting iSCSI target blocks on the service side to native Logging in  to [iface: default, target: iqn.2016-03.pt.example1:storage, portal:  172.25.254.209,3260]  (multiple) login to [iface: default, target:  Iqn.2016-03.pt.example1:storage, portal: 172.25.254.209,3260] successful. [[email protected] desktop]# fdisk -l# View disk, more/dev/sdbdisk /dev/sda: 21.5 gb, 21474836480 bytes, 41943040 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: 0x000c235a    Device Boot      Start          End      Blocks   Id  System/dev/sda1    *        2048      411647       204800   83  Linux/dev/sda2           411648     4605951      2097152   82  linux swap / solaris/dev/sda3          4605952    35796991    15595520   83   linuxdisk /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  / 4194304 bytesDisk label type: dosDisk identifier: 0x00000000    Device Boot      Start          end      blocks   id  system

The resulting iSCSI resources can then be used normally, formatted and mounted.

####### #中断使用ISCSI目标 #########

Unmount the mount first to ensure that no devices provided by the target are used

[[email protected] desktop]# iscsiadm-m node-t iqn.2016-03.pt.example1:storage-p 172.25.254.209-u# exit the iSCSI target to temporarily disconnect [ [Email protected] desktop]# iscsiadm-m node-t iqn.2016-03.pt.example1:storage-p 172.25.254.209-o-delete #删除本地连接ISCSI目标的本地记录 to permanently disconnect

This article is from the "ptallrights" blog, make sure to keep this source http://ptallrights.blog.51cto.com/11151122/1793228

Configuring iSCSI servers under Linux for resource sharing