Set up an iscsi storage

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iSCSI is a protocol that allows you to connect to block-oriented storage over the IP-network. To have an ISCSI target, you do not need to buy an enterprise-class ISCSI storage, you can start an ISCSI target as service on your computer. This is especially useful when running e.g. cluster tests on shared storage.

Contents

QuickStart

I do have a walk around for this pblroem. i have tested it on the windows 2003 server and found to be working.Below is the steps for the walk around.1)Create a Connect_SAN.bat with following commands and put it in c:\-Diskpart /s “c:\Connect_SAN.txt”-Save file2)Create a Connect_SAN.txt with following commands and put it in c:\-Select Disk N (replace N with the disk number which is offline. You can check this in logical Disk Management)-Online-Exit-Save file3)Open the Group Policy Editor (Start > Run > enter gpedit.msc'.)4)Expand Computer Configuration'.5)Expand Windows Settings'.6)Select Scripts (Startup/Shutdown)'.7)Double-click on Startup' in right-hand panel. Click on the Add' button.9)Click on the Browse' button.10)Navigate to your batch file(Connect_SAN.bat), select it and OK your way out of the Editor.11)Close the Editor.12) Reboot System

generic

In this chapter we will set up an iscsi target and test it by installing an iscsi initiator.

Set up a target

tar xvfz iscsitarget-0.4.15.tar.gz
cd iscsitarget-0.4.15
make && make install

on problems see the article Compiling.

  • create a configuration for your service:

/etc/ietd.conf

Target iqn.2007-12.local.net:storage.lvm
       Lun 0 Path=/dev/hdb
  • start the service
/etc/init.d/iscsi-target start
  • verify the service is running
$ lsof -i
[...]
ietd      8692   root    7u  IPv6  36856       TCP *:iscsi-target (LISTEN)
ietd      8692   root    8u  IPv4  36857       TCP *:iscsi-target (LISTEN)

Set up an initiator

To set up an iscsi initiator, install the openiscsi package. Then, discover your targets. Let's assume the IP-address of your target is 192.168.0.5

$ iscsiadm -m discovery -t st -p 192.168.0.5 
[fa084c] 192.168.0.5:3260,1 iqn.2001-04.com.example:storage.disk2.sys1.xyz
[3727f9] 127.0.0.1:3260,1 iqn.2001-04.com.example:storage.disk2.sys1.xyz
$ iscsiadm -m node
[fa084c] 192.168.0.5:3260,1 iqn.2001-04.com.example:storage.disk2.sys1.xyz
[3727f9] 127.0.0.1:3260,1 iqn.2001-04.com.example:storage.disk2.sys1.xyz

You know now you have a target named iqn.2001-04.com.example:storage.disk2.sys1.xyz Now have a look what drives you have attached:

$ hwinfo --block --short
disk:
  /dev/sda             VMware Virtual S
  /dev/sdb             IET VIRTUAL-DISK
partition:
[...]

Now connect your iscsi target:

$ iscsiadm -m node -T iqn.2001-04.com.example:storage.disk2.sys1.xyz -p 192.168.0.5:3260 --login

And find a new device in your list:

$ hwinfo --block --short
disk:
  /dev/sda             VMware Virtual S
  /dev/sdb             IET VIRTUAL-DISK
  /dev/sdc             IET VIRTUAL-DISK
partition:
[...]

See also