Comments on: Linux tgtadm: Setup iSCSI Target ( SAN )

By: Soumitra Pal

Soumitra Pal — Sun, 04 Dec 2011 08:01:13 +0000

It’s really nice tutorial. I am doing a LAB setup. Where I am using Open Filer for storage. In 2 node RHEL5 systems I need to share the same LUN. using “iscsiadm –mode discovery –type sendtargets –portal 192.168.1.2″ I am able to discover the LUN in both of the systems.

By: Travis Hershberger

Travis Hershberger — Thu, 20 Oct 2011 17:50:15 +0000

It is so long as you remember to use a locking filesystem properly. Something like drbl. Can’t say I’ve ever set one up so that’s all for now.

By: rex

rex — Thu, 20 Oct 2011 17:08:42 +0000

is it possible to do high available cluster environment using this technology??

By: sid

sid — Sun, 07 Aug 2011 13:49:13 +0000

Never mind. I re-did the configuration from scratch and now it is persistent after reboots. Thanks again

By: sid

sid — Sun, 07 Aug 2011 12:50:05 +0000

Thanks for the quick response. I was missing “iscsi-initiator-utils”. After installing it “tgtadm –lld iscsi –op show –mode target” started showing results. But is not persistent after reboot, I did try steps from above comment(# tgt-admin –dump > /etc/tgt/targets.conf and # chkconfig tgtd on) and it still doesn’t work. I’m using CentOS 5.4. Thanks again for the wonderful post.

By: Travis Hershberger

Travis Hershberger — Fri, 05 Aug 2011 12:09:41 +0000

At first glance it sounds like something isn’t correct with the iscsi utilities, I’d try reinstalling them.

yum reinstall iscsi-initiator-utils scsi-target-utils

By: sid

sid — Fri, 05 Aug 2011 02:25:22 +0000

I’m on CentOS 5.4 and when i run this command getting below error:
tgtadm –lld iscsi –op new –mode target –tid 1 -T iqn.2001-04.com.example:storage.disk2.amiens.sys1.xyz

tgtadm: unrecognized option ‘iscsi’
try ‘tgtadm –help’

can you please help? Thanks

By: Benjamin

Benjamin — Fri, 15 Jul 2011 23:39:48 +0000

@John

If you are booting Win2k8 “from SAN” per se, the boot partition has to have a LUN # that is neither 0 or 1 and is not more than 3 digits (ex. LUN 100, 101).

By: Travis Hershberger

Travis Hershberger — Fri, 08 Jul 2011 18:51:28 +0000

Thanks for a good tutorial. First one I found that was actually helpful in getting everything setup, bookmarked.

By: John

John — Thu, 30 Dec 2010 21:51:44 +0000

How would you make a boot LUN if all you can set it is LUN 1? Or is there anyway to make it bootable? The only OS I’ve been able to boot from that LUN is SLES 11 SP1. Tried RHEL 5 and Win2k8 and both could not locate the LUN.

By: Ade

Ade — Thu, 23 Dec 2010 18:11:17 +0000

Vincent

For making the setup persistent over reboot type this command:

# tgt-admin –dump > /etc/tgt/targets.conf

# chkconfig tgtd on

By: Ade

Ade — Thu, 23 Dec 2010 17:27:29 +0000

I also would like to know the answer to Vincents question – how to make it survive a reboot

Great post – thanks!

By: Vincent

Vincent — Wed, 14 Apr 2010 16:44:12 +0000

How do you make it persistent after reboot? I am working on ubuntu in my case.

By: sayantan

sayantan — Tue, 23 Feb 2010 06:22:53 +0000

amiens.sys1.xyz
is what?

By: ftaurino

ftaurino — Sat, 07 Nov 2009 11:05:51 +0000

hi,

iscsi can export devices, but not filesystems. if you want more than one server access the same filesystem, you have to go on gfs2 or ocfs2. it’s not so difficult to setup ;-)

and what about iet vs tgt? what’s the best iscsi target for linux?

many thanks,

ftaurino

By: chris

chris — Sat, 24 Oct 2009 05:19:27 +0000

xiaolong
iscsi cannot do file sharing. because, unlike nfs, there is no locking.
just like fc san.
you can make a lun into a zone visible to more than 1 server, you can even access the lun from them. but you do not do that because it is just a raw access. not locking.

By: xiaolong

xiaolong — Thu, 16 Jul 2009 09:35:11 +0000

hi,guys,i have a question,
when i setup a iscsi target then export an iscsi device,
then i discovery the target device on two diffenence initoator ,and mount the device
the in node a i create a file in the device which was iscsi device ,and then i think i will the file in the node b the iscsi device ,but i cann’t see the file .i get lost.

By: Matt Willsher

Matt Willsher — Fri, 05 Dec 2008 13:57:45 +0000

Great how-to, thanks.

tgt is available on Centos 5.2. (details on the introduction to RHEL 5 is at http://rhn.redhat.com/errata/RHEA-2007-0713.html)

To install:

# yum install scsi-target-utils

Works as detailed above.

By: Tapas Mallick

Tapas Mallick — Thu, 13 Nov 2008 10:50:51 +0000

Nice tutorial. Please post topics on “Cluster aware file system”.

By: vivek

vivek — Tue, 11 Nov 2008 14:01:23 +0000

Britto,

Good suggestion. OPENFILER is really good for SAN.