Daily Archives: March 23, 2017

Linux, NetApp

How to add ISCSI disk to Ubuntu server from NetApp

General info

Target = storage system. In this case NetApp.

Initiator = the server. In this case Ubuntu Linux server.

Change iqn name = You must supply the iSCSI initiator node name when you set up igroups.

To make this process go smoothly, it is a good practice to write down the node name now. Before you record the node name, you might want to change it.

By default, a node name ends with a string of random numbers.

Changing this part of the name to something such as the host name can make the node name easier to use.

Note! You can only change the last portion of the iqn name: like change the name form iqn.2005-03.com.RedHat:012345 to iqn.2005-03.com.RedHat:Toaster.

On the Linux server

  1. Install open-iscsi
    1. sudo apt install open-iscsi
  2. Change iqn name to iqn format with the server name at the end
    1. sudo vi /etc/iscsi/initiatorname.iscsi
  3. Edit iscsi config file so that the server connects automatically to the Netapp after reboot.
    1. sudo vi /etc/iscsi/iscsid.conf
    2. change the folowing line to automatic:
    3. startup = automatic
  4. Restart the iscsi service
    1. sudo systemctl restart iscsid
  • go to Netapp steps. When done, comeback here.
  1. Rediscover the Netapp
    1. sudo iscsiadm -m discovery -t sendtargets -p 192.168.1.53
  2. Connect to the netapp
    1. sudo iscsiadm -m node –login
  3. Get the list of disks on the server and locate the new ISCSI disk
    1. dmesg | grep sd
  4. Create a new partition
    1. sudo fdisk /dev/sdb
    2. n (Add new partition).
    3. P (Primery partition).
    4. enter
    5. w (Write table to disk and exit).
  5. Format the file system and mount it to /srv
    1. sudo mkfs.ext4 /dev/sdb1
    2. sudo mount /dev/sdb1 /srv
  6. Add an entry to /etc/fstab file – to mount the iscsi drive during boot:
    1. /dev/sdb1 /srv        ext4    defaults,auto,_netdev 0 0
  7. Reboot the server and verify that the disk is automatically up.
    1. sudo reboot -h now
    2. df -h

 

  • If for some reason you want to disconnect from the Netapp which means to disconnect the ISCSI disk from the server, you can logout with:
    1. sudo iscsiadm -m node –logout
  • If for some reason you want to uninstall open-iscsi package from the server, you can do it with:
    1. service open-iscsi stop
    2. sudo apt-get remove –auto-remove open-iscsi
    3. sudo reboot
    4. sudo apt-get purge open-iscsi

On the Netapp storage

  1. Create new volume
  2. Create new qutree
  3. Create new LUN
  4. Create new initiator group
  5. Add the Linux server initiator name to the initiator group
    1. You can get the initiator name by going to the Linux server and look in the initiator config file: sudo cat /etc/iscsi/initiatorname.iscsi

Sources:

(iSCSI) How to configure iSCSI for Linux

https://help.ubuntu.com/lts/serverguide/iscsi-initiator.html#iscsi-initiator-install

http://installion.co.uk/ubuntu/trusty/main/o/open-iscsi/uninstall/index.html

https://www.howtogeek.com/106873/how-to-use-fdisk-to-manage-partitions-on-linux/