Connect to iSCSI Volume from Ubuntu 20.04. Maybe this will help.
Step 1. Install open-iscsi
sudo apt update
sudo apt install open-iscsi
Step 2. Configure initiatorname.conf
We need to edit the initiatorname.conf file located in /etc/iscsi directory.
sudo nano /etc/iscsi/initiatorname.conf
Now enter the initiator name of the iSCSI target into this file.
In my example, i'm creating a SCSI drive on an Iomega ix4-200d device
For example, in my case, it would be:
InitiatorName=iqn.1992-04.com.emc:storage.ix4-200d-TILRBJ.media
Now save and close the file.
Step 3. Configure iscsid.conf
Now we need to edit the default configuration file
sudo nano /etc/iscsi/iscsid.conf
In this config file, we need to edit some sections to match our iSCSI target server. If your iSCSI target discovery authentication mode set to None, you can leave this config untouched. It will work out of the box. If your iSCSI target server use CHAP, then you need to edit the following
Find and uncomment the following line
node.session.auth.authmethod = CHAP
node.session.auth.username = username
node.session.auth.password = password
Enter the CHAP credentials, username, and password you created on the iSCSI target server. Close and save the file. Now restart the service
sudo systemctl restart iscsid open-iscsi
Step 3. Connect to the iSCSI Target
Discover the iSCSI Target
First, we will need to discover the iSCSI target. On the Terminal, use this command to discover the target
Change the IP address with your actual iSCSI Target server IP.
sudo iscsiadm -m discovery -t sendtargets -p 192.168.100.100
Note down the output as we will need to use it for the next step below. This is important if we have multiple targets in the server like above.
Connect to the iSCSI Target Volume
Now we can login to the target with this command.
sudo iscsiadm --mode node --targetname iqn.2005-10.org.freenas.ctl:iscsi01 --portal 192.168.100.100 --login
Output:
dhani@dhani-Ubuntu:~$ sudo iscsiadm --mode node --targetname iqn.2005-10.org.freenas.ctl:iscsi01 --portal 192.168.100.100 --login
Logging in to iface: default, target: iqn.2005-10.org.freenas.ctl:iscsi01, portal: 192.168.100.100,3260
Login to [iface: default, target: iqn.2005-10.org.freenas.ctl:iscsi01, portal: 192.168.100.100,3260] successful.
The command above will only connect to the iscsi01 target only. If you have multiple targets on the server, and you want to login into them all, you can use this command
sudo iscsiadm -m node -l
To log out from all the targets, use this
sudo iscsiadm -m node -u
Done.
Now let’s check our block disk using fdisk command
sudo fdisk -l
As you can see my iSCSI disk is recognized as /dev/sdb.
Step 4. Format the iSCSI Disk
So now we’ve connected to the iSCSI disk. We can then format or create a partition on the iSCSI Disk, just like a local disk. In the following example, I will create a new partition and format the disk to ext4 file system.
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Was having problems creating partitions larger that 2TB so used sudo gdisk /dev/sdb
instead and that allowed me to create larger parititons.
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sudo fdisk /dev/sdb
Now type n to create a new partition.
Command (m for help): n
Partition type
p primary (0 primary, 0 extended, 4 free)
e extended (container for logical partitions)
Select (default p):
Type p to create primary partition and then type 1 to create one partition. You can change this to two for example, if you want to create two partitions.
Select (default p): p
Partition number (1-4, default 1): 1
First sector (256-13107203, default 256):
Last sector, +/-sectors or +/-size{K,M,G,T,P} (256-13107203, default 13107203):
Created a new partition 1 of type ‘Linux’ and of size 50 GiB.
Type w to write the change. Next, let’s check using fdisk
sudo fdisk -l
As you can see, now I have a new partition called /dev/sdb1.
Format the partition to ext4
Next, I will format this partition to ext4 file system.
sudo mkfs.ext4 /dev/sdb1
dhani@dhani-Ubuntu:~/Downloads$ sudo sudo mkfs.ext4 /dev/sdb1
mke2fs 1.45.5 (07-Jan-2020)
Discarding device blocks: done
Creating filesystem with 13106948 4k blocks and 3276800 inodes
Filesystem UUID: aa38ff4c-9d84-49c2-a1d9-9c368319f95f
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424
Allocating group tables: done
Writing inode tables: done
Creating journal (65536 blocks): done
Writing superblocks and filesystem accounting information: done
Mount the partition
sudo mkdir /mnt/iscsi_disk
mount /dev/sdb1 /mnt/iscsi-disk
