iscsitarget-devel — Development of iSCSI Enterprise Target

[Iscsitarget-devel] questions and comments

[franklin w <yf...@ho...>]

hi,all 
I have a few questions/comments after reading tomof's writings. 
1. in faq, 
 "Can I configure security policy per a LUN? Yes. "
 Is security policy is configured per a Lu? It is per  
 Target according to iSCSI spec. If you support only one Lu in
 a target, you may say that. is it that so?
 
2.about flexible IO architecture
 I think this is a good idea and I have imagined it for a long time.
I have not dive into your code and don't know weather i could add another 
io mode easily(fg. a io mode like diskio in UNH).

 Additionaly, i have a question on choice of I/O interface. For performnace 
considerations,there are two relevant factors: system cache, length of I/O 
path.Higner interfaces have more advantages on system cache,while lower 
interfaces have more advantages on length of I/O path.Can anybody give a 
more explanation？How much does page cache/buffer cache affects? how abouth 
length of I/O path?

3. I think there is puzzle on the use of target. 
"I succeed to make two UNH initiators connect with a single target just 
now. The target exports two target names. Both initiators connect with one 
target name."

I think the folloing expressing should be more clear:
A iSCSI (target) server ,which runs on a network entity, can be configured 
to exporting multi target.

welcome any further comments.
frank

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[Iscsitarget-devel] This migth be a noob question...

[<Mag...@br...>]

Hello all of you!

=20

This seems to be the software i really need!

=20

I'm planning a setup of a Microsoft Cluster here at home and the problem =
with a MS Cluster is the requirement of having shared disks. To use =
shared disks you'll have to have SCSI-Disks or a SAN. iSCSI seems to be =
the soloution for me, at least for testing purposes.

=20

However, when I try to install the software I get some error messages:

=20

[root@san01 iscsitarget-0.1.0]# make KERNELSRC=3D/usr/src/linux-2.4

<a lot of text>

/usr/src/linux-2.4.20-8/include/asm/uaccess.h:603: =
`clear_user_R_ver_str' declared as function returning a function

/usr/src/linux-2.4.20-8/include/asm/uaccess.h:603: warning: function =
declaration isn't a prototype

/usr/src/linux-2.4.20-8/include/asm/uaccess.h:604: =
`__clear_user_R_ver_str' declared as function returning a function

/usr/src/linux-2.4.20-8/include/asm/uaccess.h:604: warning: parameter =
names (without types) in function declaration

target.c: In function `target_cmnd_alloc':

target.c:28: warning: implicit declaration of function =
`printk_R1b7d4074'

make[2]: *** [target.o] Error 1

make[2]: Leaving directory =
`/usr/src/iscsi-target/iscsitarget-0.1.0/kernel'

make[1]: *** [_mod_/usr/src/iscsi-target/iscsitarget-0.1.0/kernel] Error =
2

make[1]: Leaving directory `/usr/src/linux-2.4.20-8'

make: *** [mods] Error 2

[root@san01 iscsitarget-0.1.0]#

[root@san01 iscsitarget-0.1.0]#

=20

Is there a way to get around this problem? I'm not very experienced with =
linux... However it's RedHat 9.0.

=20

/Magnus

[Iscsitarget-devel] RE: Ang: Fw: Re: New iSCSI target project

[<to...@ac...>]

Hello,

Let's discuss this at the mailing list.

From: Ming Zhang <mi...@el...>
Subject: RE: Ang: Fw: Re: New iSCSI target project
Date: Sat, 29 May 2004 16:00:43 -0400

> Hi, I am wondering if we can have a code tree that has 2.4 and 2.6
> coexist like what I did in UNH code. Providing Makefile-2.4 and
> Makefile-2.6 and use defines to process 2.4 and 2.6 different when need.
> If that 2.6 code is workable, then we should shift our attention to 2.6
> since that is the trend. While we still keep 2.4 code in it because that
> is more mature. 

Don't Put "ifdef" directly in the C source like done in UNH code (see
http://www.linuxjournal.com/article.php?sid=5780).

Just coexisting is easy. But I want to reimplement several functions
with the 2.6 kernel for performance. So the difference would be
bigger.

I don't think that there are enough resources for maintaining two
versions. So we have to give up the version for the 2.4 at some future
time.

I want to go with the 2.6 kernel. But I want to fix some of must-fix
things in the todo list before that.


Regards,
--
tomo

Re: [Iscsitarget-devel] Multiple Initiator Connections

[<to...@ac...>]

Hi,

Thanks a lot for trying the target.

From: Hugo L Samayoa Jr <lor...@te...>
Subject: [Iscsitarget-devel] Multiple Initiator Connections
Date: Sun, 30 May 2004 00:03:50 -0700

> 1) Once UNH connects to the target and then stops then starts again it
> fails to connect. No error messages in syslog on the target machine. I
> tried this with UNH target in file mode and was able to restart my
> connections. Since I can't get DISKIO to work on the UNH target, I can't
> do the same exact test.

You can't bring down the target cleanly. Due to the bug, the initiator
failed to connect with the target at the second time, I think.

I want to fix this bug as soon as possible. However it includes
several other issues. Please give me some time.


> 2) Once I connect to the target I can't connect from another initiator
> server. It will stay trying to connect and then once I unload the UNH
> initiator on the first machine the second machine is able to connect
> right away. 

I succeed to make two UNH initiators connect with a single target just
now. The target exports two target names. Both initiators connect with
one target name.

I put the configuration file at

http://zaal.org/iscsi/ardis/misc/iscsid.config

If you still have a problem, please attach all configuration files
(two initiators and one target).


Regards,
--
tomo

Re: [Iscsitarget-devel] TODO list

[<to...@ac...>]

Hi,

From: Ming Zhang <mi...@el...>
Subject: Re: [Iscsitarget-devel] TODO list
Date: Sat, 29 May 2004 09:51:48 -0400

> Hi, a minor issue. the port to 2.6 is duplicated.

Thanks. I fixed it.

Regards,
--
tomo

[Iscsitarget-devel] Multiple Initiator Connections

[Hugo L S. Jr <lor...@te...>]

I have a couple of problems that I've found. I'm using UNH as the
initiator.

1) Once UNH connects to the target and then stops then starts again it
fails to connect. No error messages in syslog on the target machine. I
tried this with UNH target in file mode and was able to restart my
connections. Since I can't get DISKIO to work on the UNH target, I can't
do the same exact test.

2) Once I connect to the target I can't connect from another initiator
server. It will stay trying to connect and then once I unload the UNH
initiator on the first machine the second machine is able to connect
right away. 

I wish I can get #1 problem to do a full test. Any pointers on trying to
get UNH's target or ARDIS target or even another initiator to get setup
would be appretiated. Fedora comes with the cisco initiator package but
I can't load it because its missing a iscsi module. Anybody know were to
get this? Or does it come when you compile from source?


BTW -  Great software. I noticed the TODO list and have run into the
server not having a clean shutdown. Any testing with any of the product
point my way I have plenty of hardware.

-Hugo

Re: [Iscsitarget-devel] FAQs

[Ming Z. <mi...@el...>]

I am sorry that I provided some wrong information on forum. i compute
the other patches in it. :p

ming

On Sat, 2004-05-29 at 01:26, to...@ac... wrote:
> Hi,
> 
> I wrote up FAQs.
> 
> http://iscsitarget.sourceforge.net/faq.html
> 
> corrections, comments, and suggestions are welcome.
> 
> P.S.
> Since the first release, nobody has said that the target works. Has
> anybody succeeded to run it?
> 
> Regards,
> ---
> tomo
> 
> 
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-- 
 --------------------------------------------------
| Ming Zhang, PhD. Student
| Dept. of Electrical & Computer Engineering
| College of Engineering
| University of Rhode Island
| Kingston RI. 02881
| e-mail: mingz at ele.uri.edu
| Tel. (401) 874-2293 
| Fax. (401) 782-6422
| http://www.ele.uri.edu/~mingz/
 --------------------------------------------------

[Iscsitarget-devel] TODO list

[<to...@ac...>]

Hello again,

I uploaded the TODO list.

http://iscsitarget.sourceforge.net/todo.html

corrections, comments, and suggestions are welcome.

Regards,
--
tomo

[Iscsitarget-devel] FAQs

[<to...@ac...>]

Hi,

I wrote up FAQs.

http://iscsitarget.sourceforge.net/faq.html

corrections, comments, and suggestions are welcome.

P.S.
Since the first release, nobody has said that the target works. Has
anybody succeeded to run it?

Regards,
---
tomo