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Before start with this article, please check our previous guide how to install and configure openfiler.
Now we will explian how to add the target disk to our local server.
Details:
Openfiler Server: 192.168.1.141
Centos Server: 192.168.1.137
The commands bellow should be working in other Linux distro.
First, install some needed packages.
Centos :
yum -y install iscsi-initiator-utils
service iscsid start
service iscsi start
Ubuntu:
sudo apt-get install open-iscsi
Opensuse
# zypper install open-iscsi
Discovering targets in iSCSI server:
[root@machine1 ~]# iscsiadm --mode discovery -t sendtargets --portal 192.168.1.141
192.168.1.141:3260,1 iqn.2006-01.com.openfiler:tsn.d625a0d9cb77
Trying to login with the iSCSI LUN:
[root@machine1 ~]# iscsiadm --mode node --targetname iqn.2006-01.com.openfiler:tsn.d625a0d9cb77 --portal 192.168.1.141 --login
Logging in to [iface: default, target: iqn.2006-01.com.openfiler:tsn.d625a0d9cb77, portal: 192.168.1.141,3260] (multiple)
Login to [iface: default, target: iqn.2006-01.com.openfiler:tsn.d625a0d9cb77, portal: 192.168.1.141,3260] successful.
[root@machine1 ~]#
With this command is reponsible of the update of iSCSI targets database for the files located in /var/lib/iscsi/ :
[root@machine1 ~]# cat /var/lib/iscsi/send_targets/192.168.1.141,3260/st_config
# BEGIN RECORD 6.2.0-873.10.el6
discovery.startup = manual
discovery.type = sendtargets
discovery.sendtargets.address = 192.168.1.141
discovery.sendtargets.port = 3260
discovery.sendtargets.auth.authmethod = None
discovery.sendtargets.timeo.login_timeout = 15
discovery.sendtargets.use_discoveryd = No
discovery.sendtargets.discoveryd_poll_inval = 30
discovery.sendtargets.reopen_max = 5
discovery.sendtargets.timeo.auth_timeout = 45
discovery.sendtargets.timeo.active_timeout = 30
discovery.sendtargets.iscsi.MaxRecvDataSegmentLength = 32768
# END RECORD
[root@machine1 ~]#
Now check if the disk add to your machine
[root@machine1 ~]# fdisk -l
Disk /dev/sda: 17.8 GB, 17791238144 bytes
255 heads, 63 sectors/track, 2162 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000a0b90
Device Boot Start End Blocks Id System
/dev/sda1 * 1 1275 10240000 83 Linux
/dev/sda2 1275 1913 5120000 8e Linux LVM
/dev/sda3 1913 2066 1228800 82 Linux swap / Solaris
Disk /dev/mapper/vg_machine1-LogVol01: 209 MB, 209715200 bytes
255 heads, 63 sectors/track, 25 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/mapper/vg_machine1-LogVol00: 2097 MB, 2097152000 bytes
255 heads, 63 sectors/track, 254 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/sdb: 369 MB, 369098752 bytes
12 heads, 59 sectors/track, 1018 cylinders
Units = cylinders of 708 * 512 = 362496 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
[root@machine1 ~]#
Create file system in this disk
[root@machine1 ~]# fdisk /dev/sdb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0x41c55bb7.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 2
First cylinder (1-1018, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-1018, default 1018):
Using default value 1018
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
and
[root@machine1 ~]# mkfs.ext4 /dev/sdb2
mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
Stride=0 blocks, Stripe width=0 blocks
90112 inodes, 360340 blocks
18017 blocks (5.00%) reserved for the super user
First data block=1
Maximum filesystem blocks=67633152
44 block groups
8192 blocks per group, 8192 fragments per group
2048 inodes per group
Superblock backups stored on blocks:
8193, 24577, 40961, 57345, 73729, 204801, 221185
Writing inode tables: done
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 37 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
Prepare the directory to mount the disk.
[root@machine1 ~]#[root@machine1 ~]# mkdir /iscsi-openfiler
[root@machine1 ~]# mount -t ext4 /dev/sdb2 /iscsi-openfiler/
[root@machine1 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 9.7G 2.4G 6.9G 26% /
tmpfs 751M 0 751M 0% /dev/shm
/dev/mapper/vg_machine1-LogVol00
2.0G 35M 1.8G 2% /home
/dev/mapper/vg_machine1-LogVol01
194M 5.6M 179M 4% /tmp
/dev/sdb2 341M 11M 314M 4% /iscsi-openfiler
Please add this to mount the net drive with Linux start.add this to /etc/fstab.
/dev/sdb2 /iscsi-openfiler ext4 _netdev,rw 0 0
and
chkconfig netfs on
chkconfig iscsi on
There are three ways to disable or delete an iSCSI target.
First, to disable an iSCSI target:
# iscsiadm --m node -T iqn.2006-01.com.openfiler:tsn.d625a0d9cb77 --portal 192.168.1.141:3260 -u
Second, it is possible to delete the target’s record ID:/p>
# iscsiadm -m node -o delete -T iqn.2006-01.com.openfiler:tsn.d625a0d9cb77 --portal 192.168.1.141:3260
Thirdly, stop the iSCSI service.
Enjoy!
