Re: iSCSI target for kfreebsd

2011-05-03 Thread Arno Töll 
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Hi Xin Li,

thank you a lot for joining this discussion, much appreciated.

On 03.05.2011 20:58, Xin LI wrote:
> iet is a ported version of Linux "iSCSI Enterprise Target" by QuadStor
> systems (Shivaram Upadhyayula; cc'ed).  It's not based on FreeBSD's
> Linux compatibility layer, though, and therefore I believe that it would
> work on Debian/kFreeBSD without much changes.

I am not concerned about portability, I'm pretty optimistic it could be
ported straightforward to kfreebsd. I am curious whether we can assume,
you as upstream source provider of this patch are confident to maintain
it over a long term, a tight integration into FreeBSD's/FreeNAS iSCSI
concept would be such an indicator. See this is definitively not a
trivial patch and I'm unsure whether your upstream source (i.e. the
iscsitarget project, also invited to join this discussion - please start
on http://lists.debian.org/debian-bsd/2011/05/msg1.html) is
interested to merge your patch for example.

Once this patch would enter Debian Stable we would have to provide
security patches for roughly 3 years, perhaps even more and moreover we
would rely on you porting every now and then your patch to a new
upstream version or adapt it to new FreeBSD kernels if necessary.

> Our initial test on iet have shown very good performance, but that test
> does not cover using ZFS zvol volumes.  Currently FreeNAS is still using
> istgt as its iSCSI implementation and with some tuning it can saturate
> GigE in our test.

Sounds great. Do you have plans to support ZFS volumes within a
forseeable time frame?

> Personally I'd prefer iet more, as its configuration is more
> understandable for people with some experience with other iSCSI
> products, but for licensing reasons it might not be a good choice for
> inclusion in FreeBSD base system unless there is some very appealing
> reasons, as people can always install a new version of iet from ports.

That's exactly my point, see my concerns above. Moreover I personally
would prefer iet as well, as I know it from Linux where it is best known
for its stability and performance and it exists in Debian already.


- -- 
with kind regards,
Arno Töll
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Re: iSCSI target for kfreebsd

2011-05-03 Thread Xin LI 
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Hi, Arno,

On 05/02/11 14:48, Arno Töll wrote:
> On 02.05.2011 22:57, David N wrote:
> 
>> istgt does seem to work well with ZFS.
> 
> It does. Nonetheless, if there is a sane way to provide iscsitarget on
> kfreebsd it is the better choice, as the latter is a kernel driver which
> is presumably faster than a user space implementation like istgt is. On
> the other hand also both alternatives could be provided.
> 
> However, looking on the FreeBSD iet port this is a really crazy patch on
> top and around of the Linux compatibility layer. Maybe it would be
> helpful to know whether there have been approaches to include this patch
> into upstreams source and FreeBSDs plans related to iSCSI targets in
> general, as we have to keep maintainability in mind.
> 
> Therefore I invite Xin LI, author of the FreeBSD port, to join this
> discussion as he might be able to tell us more. Start of this discussion
> is on .

iet is a ported version of Linux "iSCSI Enterprise Target" by QuadStor
systems (Shivaram Upadhyayula; cc'ed).  It's not based on FreeBSD's
Linux compatibility layer, though, and therefore I believe that it would
work on Debian/kFreeBSD without much changes.

Our initial test on iet have shown very good performance, but that test
does not cover using ZFS zvol volumes.  Currently FreeNAS is still using
istgt as its iSCSI implementation and with some tuning it can saturate
GigE in our test.

Personally I'd prefer iet more, as its configuration is more
understandable for people with some experience with other iSCSI
products, but for licensing reasons it might not be a good choice for
inclusion in FreeBSD base system unless there is some very appealing
reasons, as people can always install a new version of iet from ports.

Cheers,
- -- 
Xin LI http://www.delphij.net/
FreeBSD - The Power to Serve!  Live free or die
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Re: iSCSI target for kfreebsd

2011-05-02 Thread Arno Töll 
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On 02.05.2011 22:57, David N wrote:

> istgt does seem to work well with ZFS.

It does. Nonetheless, if there is a sane way to provide iscsitarget on
kfreebsd it is the better choice, as the latter is a kernel driver which
is presumably faster than a user space implementation like istgt is. On
the other hand also both alternatives could be provided.

However, looking on the FreeBSD iet port this is a really crazy patch on
top and around of the Linux compatibility layer. Maybe it would be
helpful to know whether there have been approaches to include this patch
into upstreams source and FreeBSDs plans related to iSCSI targets in
general, as we have to keep maintainability in mind.

Therefore I invite Xin LI, author of the FreeBSD port, to join this
discussion as he might be able to tell us more. Start of this discussion
is on .


- -- 
with kind regards,
Arno Töll
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Re: iSCSI target for kfreebsd

2011-05-02 Thread David N 
2011/5/3 Arno Töll :
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>
> On 02.05.2011 21:41, Edward Tomasz Napierała wrote:
>> Three, actually - there is also iSCSI Enterprise Target (net/iet),
>> and from what I've heard, it may soon become the most important one.
>
> Thank you for the hint. This is, in fact, the iscsitarget for Linux I
> was speaking above. Apparently that one works on FreeBSD as well. That
> should ease porting efforts a lot, since there is already a package in
> Debian providing iet, although it is not suitable for kfreebsd as is.
>
> I will try getting it to work on kfreebsd.
>
> - --
> with kind regards,
> Arno Töll
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>

We've used FreeBSD istgt file backed image and used the same image
with Debian Squeeze tgt without any problems.

istgt does seem to work well with ZFS.

Regards
David N


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Re: iSCSI target for kfreebsd

2011-05-02 Thread Arno Töll 
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On 02.05.2011 21:41, Edward Tomasz Napierała wrote:
> Three, actually - there is also iSCSI Enterprise Target (net/iet),
> and from what I've heard, it may soon become the most important one.

Thank you for the hint. This is, in fact, the iscsitarget for Linux I
was speaking above. Apparently that one works on FreeBSD as well. That
should ease porting efforts a lot, since there is already a package in
Debian providing iet, although it is not suitable for kfreebsd as is.

I will try getting it to work on kfreebsd.

- -- 
with kind regards,
Arno Töll
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Re: iSCSI target for kfreebsd

2011-05-02 Thread Edward Tomasz Napierała 
Wiadomość napisana przez Arno Töll w dniu 2011-05-02, o godz. 00:17:
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> 
> Hello,
> 
> kfreebsd misses an iSCSI target so far. This would be an useful addition
> to kfreebsd and its ZFS support. Indeed many people I encountered so far
> which were trying out kfreebsd ask for ZFS and occasionally for iSCSI
> support as well.
> 
> The only packages available in kfreebsd right now are
> iscsitarget-(dkms|source). As you may derive from their names, those
> packages are not at all useful for kfreebsd as they are tightly linked
> with the Linux kernel and exist on kfreebsd only because no one cared to
> implement "architecture: linux-all" so far.
> 
> FreeBSD has two iSCSI targets available: "iscsi-target"
> (/usr/ports/net/iscsi-target) and "istgt" (/usr/ports/net/istgt/) (learn
> more on [1]). I tried to compile the latter and it works out of the box
> on kfreebsd. Therefore istgt could provide an iSCSI target for Debian
> without too much effort.

Three, actually - there is also iSCSI Enterprise Target (net/iet),
and from what I've heard, it may soon become the most important one.

--
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