Netapp – Linux iscsi setup

A quick guide to setup IP SAN using Linux-Netapp-iscsi.

On Linux server :

1. Install iSCSI initiator (iscsi-initiator-utils rpm) on your linux machine. This will create the necessary binaries and will create /etc/iscsi.conf and /etc/initiatorname.iscsi
2. Add iscsi-iname to /etc/initiatorname.iscsi .

   [root@unixfoo ~]# iscsi-iname
   iqn.1987-05.com.cisco:01.44c65d9587d9
   [root@unixfoo ~]#

   Add the output to /etc/initiatorname.iscsi

3. Add the below lines to /etc/iscsi.conf

   Continuous=no
   HeaderDigest=never
   DataDigest=never
   ImmediateData=yes
   DiscoveryAddress=192.185.12.12

   DiscoveryAddress should be the IP address of the storage.

On Netapp filer :

1. Make sure you have iscsi license enabled.
2. Create volume for holding the iscsi luns.

   filer1> vol create iscsivol aggr01 100g

3. Create lun on the volume

   filer1> lun create -s 50g -t linux /vol/iscsivol/lun1

4. Create an igroup and add the Linux iscsi-iname to it.

   filer1> igroup create -i -t linux iscsigrp
   filer1> igroup add iscsigrp iqn.1987-05.com.cisco:01.44c65d9587d9
   filer1> igroup show
       iscsigrp (iSCSI) (ostype: linux):
           iqn.1987-05.com.cisco:01.44c65d9587d9 (logged in on: iswta)
   filer1>

5. Map the lun to the iscsi-group.

   filer1> lun map /vol/iscsivol/lun1 iscsigrp 0

6. Enable only one interface for iscsi use and disable others

   filer1> iswt interface disable e7
   filer1> iswt interface show
   Interface e0 disabled
   Interface e4 enabled
   Interface e5 disabled
   Interface e7 disabled
   filer1>

7. Done on the Netapp side.

On Linux again :

1. Start iscsi initiator

   [root@unixfoo ~]# /etc/init.d/iscsi start
   Checking iscsi config:                                     [  OK  ]
   Loading iscsi driver:                                      [  OK  ]
   Starting iscsid:                                           [  OK  ]
   [root@unixfoo ~]#

2. Set iscsi initiator to start automatically after reboot.

   [root@unixfoo ~]# chkconfig  iscsi on

3. Check whether the iscsi lun shows up on the linux machine.

   [root@unixfoo ~]# iscsi-ls
   *******************************************************************************
   SFNet iSCSI Driver Version …4:0.1.11-3(02-May-2006)
   *******************************************************************************
   TARGET NAME             : iqn.1992-08.com.netapp:sn.50380528
   TARGET ALIAS            :
   HOST ID                 : 2
   BUS ID                  : 0
   TARGET ID               : 0
   TARGET ADDRESS          : 192.185.12.12:3260,2
   SESSION STATUS          : ESTABLISHED AT Sat Dec 29 21:55:37 PST 2007
   SESSION ID              : ISID 00023d000001 TSIH 501

   DEVICE DETAILS:
   —————
   LUN ID : 0
     Vendor: NETAPP   Model: LUN              Rev: 0.2
     Type:   Direct-Access                    ANSI SCSI revision: 04
     page83 type3: 60a980004f6444662653053584516d34
     page80: 4f6444516d344305358066265a
     Device: /dev/sdb

   *******************************************************************************
   [root@unixfoo ~]#

4. Now you have a new device in your linux box (/dev/sdb) – that is your iscsi device. You can create filesystem on it and use it.
5. Done!