Lets  know the status of the machine
Server   =  Centos 7 IP = 192.168.183.129
[[email protected] ~]# fdisk -l Disk /dev/sda: 32.2 GB, 32212254720 bytes, 62914560 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: 0x00047725   Device Boot     Start        End     Blocks  Id System /dev/sda1  *       2048    1026047     512000  83 Linux /dev/sda2        1026048   62914559   30944256  8e Linux LVM Disk /dev/sdb: 5368 MB, 5368709120 bytes, 10485760 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-root: 29.5 GB, 29490151424 bytes, 57597952 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: 2147 MB, 2147483648 bytes, 4194304 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 [[email protected] ~]#
[[email protected] ~]# mkfs.ext4Â Â /dev/sdb mke2fs 1.42.9 (28-Dec-2013) /dev/sdb is entire device, not just one partition! Proceed anyway? (y,n) y Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks, Stripe width=0 blocks 327680 inodes, 1310720 blocks 65536 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=1342177280 40 block groups 32768 blocks per group, 32768 fragments per group 8192 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736Allocating group tables: done Writing inode tables: done Creating journal (32768 blocks): done Writing superblocks and filesystem accounting information: done[[email protected] ~]#
mkdir  /storage mount -t ext4 /deb/sdb /storage
Lets check the  directory mounted
[email protected] ~]# df -h Filesystem              Size Used Avail Use% Mounted on /dev/mapper/centos-root  28G 1.1G  27G  4% / devtmpfs                479M    0 479M  0% /dev tmpfs                   489M    0 489M  0% /dev/shm tmpfs                   489M 6.8M 483M  2% /run tmpfs                   489M    0 489M  0% /sys/fs/cgroup /dev/sda1               497M 168M 330M 34% /boot tmpfs                    98M    0  98M  0% /run/user/0 /dev/sdb                4.8G  20M 4.6G  1% /storage [[email protected] ~]#
/dev/sdb /storage ext4 defaults 0 0
I- Lets start Iscsi admin tool
[[email protected] ~]# yum -y install targetcli
II- Access  Admin console
[[email protected] ~]# targetcli Warning: Could not load preferences file /root/.targetcli/prefs.bin. targetcli shell version 2.1.fb41 Copyright 2011-2013 by Datera, Inc and others. For help on commands, type 'help'. /> and go to this directory cd backstores/fileio > cd /backstores/fileio
III- create a disk-image with the name “disk01” on /storage/disk01.img with 3G
/>/backstores/fileio> create disk01 /storage/disk01.img 3G Created fileio disk01 with size 3221225472 /backstores/fileio>
IV-create Target  iqn.2016-02.unixmen.com:storage.target00
/backstores/fileio> cd  /iscsi /iscsi> ls o- iscsi .............................................................................................................. [Targets: 0] /iscsi> create iqn.2016-02.unixmen.com:storage.target00 Created target iqn.2016-02.unixmen.com:storage.target00. Created TPG 1. Global pref auto_add_default_portal=true Created default portal listening on all IPs (0.0.0.0), port 3260. /iscsi>
V- Set ip  adres  of the target under Portals folder
/iscsi> cd iqn.2016-02.unixmen.com:storage.target00/tpg1/portals/ /iscsi/iqn.20.../tpg1/portals>
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 192.168.183.129
Using default IP port 3260
Created network portal 192.168.183.129:3260.
/iscsi/iqn.20.../tpg1/portals> ls
o- portals .................................................................................... [Portals: 1]
 o- 192.168.183.129:3260.................................................................................. [OK]
/iscsi/iqn.20.../tpg1/portals>
VI- Set LUN
/iscsi/iqn.20…/tpg1/portals> cd  ../luns
/iscsi/iqn.20…t00/tpg1/luns> create /backstores/fileio/disk01
Created LUN 0.
/iscsi/iqn.20…t00/tpg1/luns>
VII authorize access .
in this method , we will open access for every machine and without identification
set attribute authentication=0 set attribute generate_node_acls=1 set attribute demo_mode_write_protect=0 exit /iscsi/iqn.20...t00/tpg1/luns> cd ../ /iscsi/iqn.20...target00/tpg1> set attribute authentication=0 Parameter authentication is now '0'. /iscsi/iqn.20...target00/tpg1> set attribute generate_node_acls=1 Parameter generate_node_acls is now '1'. /iscsi/iqn.20...target00/tpg1> set attribute demo_mode_write_protect=0 Parameter demo_mode_write_protect is now '0'. /iscsi/iqn.20...target00/tpg1> exit Global pref auto_save_on_exit=true Last 10 configs saved in /etc/target/backup. Configuration saved to /etc/target/saveconfig.json [[email protected] ~]#
VIII- the machine is ready
[[email protected] ~]# netstat  -an | grep -i   3260 tcp       0     0 192.168.183.129:3260   0.0.0.0:*              LISTEN    [[email protected] ~]# [[email protected] ~]# lsblk NAME           MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda              8:0   0  30G 0 disk ├─sda1           8:1   0 500M 0 part /boot └─sda2           8:2   0 29.5G 0 part  ├─centos-root 253:0   0 27.5G 0 lvm /  └─centos-swap 253:1   0   2G 0 lvm [SWAP] sdb              8:16  0   5G 0 disk /storage sr0             11:0   1   4G 0 rom  [[email protected] ~]#
IX- Connect from the Clietnt
Server is also centos7Â with IP 192.168.183.21
first   iscsi initiator
yum install iscsi-initiator-utils.x86_64
My actual Disks
[[email protected] ~]# df -h Filesystem              Size Used Avail Use% Mounted on /dev/mapper/centos-root  28G 1.1G  27G  4% / devtmpfs                479M    0 479M  0% /dev tmpfs                   489M    0 489M  0% /dev/shm tmpfs                   489M 6.7M 483M  2% /run tmpfs                   489M    0 489M  0% /sys/fs/cgroup /dev/sda1               497M 168M 330M 34% /boot /dev/sdb                5.0G  33M 5.0G  1% /glusterfs/storage1 tmpfs                    98M    0  98M  0% /run/user/0
Connect the ISCSCI  target
Discover the target
[[email protected] ~]# iscsiadm  --mode discoverydb --type sendtargets --portal 192.168.183.129  --discover 192.168.183.129:3260,1 iqn.2016-02.unixmen.com:storage.target00
Add the disk
[[email protected] ~]# iscsiadm  --mode node --targetname iqn.2016-02.unixmen.com:storage.target00 --portal 192.168.183.129:3260  --login Logging in to [iface: default, target: iqn.2016-02.unixmen.com:storage.target00, portal: 192.168.183.129,3260] (multiple) Login to [iface: default, target: iqn.2016-02.unixmen.com:storage.target00, portal: 192.168.183.129,3260] successful.
Congratulation you have now an extra disk
[[email protected] ~]# fdisk -l Disk /dev/sdb: 5368 MB, 5368709120 bytes, 10485760 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/sda: 32.2 GB, 32212254720 bytes, 62914560 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: 0x00047725   Device Boot     Start        End     Blocks  Id System /dev/sda1  *       2048    1026047     512000  83 Linux /dev/sda2        1026048   62914559   30944256  8e Linux LVM Disk /dev/mapper/centos-root: 29.5 GB, 29490151424 bytes, 57597952 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: 2147 MB, 2147483648 bytes, 4194304 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/sdc: 3221 MB, 3221225472 bytes, 6291456 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 8388608 bytes [[email protected] ~]# lsblk NAME           MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda              8:0   0  30G 0 disk ├─sda1           8:1   0 500M 0 part /boot └─sda2           8:2   0 29.5G 0 part  ├─centos-root 253:0   0 27.5G 0 lvm /  └─centos-swap 253:1   0   2G 0 lvm [SWAP] sdb              8:16  0   5G 0 disk /glusterfs/storage1 sdc              8:32  0   3G 0 disk sr0             11:0   1   4G 0 rom  [[email protected] ~]#
Now  you can fdisk   /dev/sdc  to  make partitionsÂ
[[email protected] ~]# fdisk   /dev/sdc Welcome to fdisk (util-linux 2.23.2). Changes will remain in memory only, until you decide to write them. Be careful before using the write command. Device does not contain a recognized partition table Building a new DOS disklabel with disk identifier 0xcc2a4d65. Command (m for help): n Partition type:   p  primary (0 primary, 0 extended, 4 free)   e  extended Select (default p): Using default response p Partition number (1-4, default 1): First sector (16384-6291455, default 16384): Using default value 16384 Last sector, +sectors or +size{K,M,G} (16384-6291455, default 6291455): Using default value 6291455 Partition 1 of type Linux and of size 3 GiB is set Command (m for help): t Selected partition 1 Hex code (type L to list all codes): 83 Changed type of partition 'Linux' to 'Linux' Command (m for help): p Disk /dev/sdc: 3221 MB, 3221225472 bytes, 6291456 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 8388608 bytes Disk label type: dos Disk identifier: 0xcc2a4d65   Device Boot     Start        End     Blocks  Id System /dev/sdc1          16384    6291455    3137536  83 Linux Command (m for help): w The partition table has been altered! Calling ioctl() to re-read partition table. Syncing disks. [[email protected] ~]#
create a folder /iscsi-disk
[email protected] ~]# mkdir /iscsi-disk
Format the disk /dev/sdc1 with ext4
[[email protected] ~]# mkfs.ext4  /dev/sdc1 mke2fs 1.42.9 (28-Dec-2013) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks, Stripe width=2048 blocks 196224 inodes, 784384 blocks 39219 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=803209216 24 block groups 32768 blocks per group, 32768 fragments per group 8176 inodes per group Superblock backups stored on blocks:        32768, 98304, 163840, 229376, 294912 Allocating group tables: done                           Writing inode tables: done                           Creating journal (16384 blocks): done Writing superblocks and filesystem accounting information: done [[email protected] ~]#
Mount the dormated partion to /iscsi-disk
[[email protected] ~]# mount /dev/sdc1 /iscsi-disk/ [[email protected] ~]# df -h Filesystem              Size Used Avail Use% Mounted on /dev/mapper/centos-root  28G 1.1G  27G  4% / devtmpfs                479M    0 479M  0% /dev tmpfs                   489M    0 489M  0% /dev/shm tmpfs                   489M 6.8M 483M  2% /run tmpfs                   489M    0 489M  0% /sys/fs/cgroup /dev/sda1               497M 168M 330M 34% /boot /dev/sdb                5.0G  33M 5.0G  1% /glusterfs/storage1 tmpfs                    98M    0  98M  0% /run/user/0 /dev/sdc1               2.9G 9.0M 2.8G  1% /iscsi-disk [[email protected] ~]#
To make   mount htis disk permanntly  every  reboot please  add this to your /etc/fstab file
/dev/sdc1 /iscsi-disk/  ext4   defaults,_netdev  0 0
save and exit
Done