[openib-general] [iser]about the target

[Michael Krause]

At 06:14 AM 7/6/2005, Rimmer, Todd wrote:
>I would like to clarify the comment on SRP.  There are companies presently 
>shipping and demonstrating SRP native IB storage.  For example:
>     Engenio (formerly LSI)
>     Raytheon
>     Data Direct
>     Mellanox
>
>SRP was designed for highly optimized storage access across an RDMA 
>capable transport, and hence is capable of very high performance.
>
>Longer term the storage vendors anticipate that iSCSI will be the focus 
>for long haul (remote backup, etc) type solutions, while IB Native Storage 
>and FC will be the focus for data center high performance storage solutions.

iSCSI within the data center is quite real for many applications especially 
blades where there is already an Ethernet interface.  The reason for iSER 
was to take advantage of the iSCSI ecosystem while providing a RDMA focused 
data mover.  SRP is primarily a data mover and does not define the rest of 
the management, etc. interfaces.  When used to move data to a FC, the FC 
infrastructure is leveraged but SRP by itself does nothing really in this 
regard.  No one stated that SRP could not deliver performance only that the 
rest of the infrastructure is not defined and must rely upon other 
standards / plug-ins / etc.  I do not want to get into a vision / marketing 
debate - was just explaining why we created iSER instead of just enhancing SRP.

Mike

>
>Todd R.
>-----Original Message-----
>From: Michael Krause [mailto:krause at cup.hp.com]
>Sent: Tuesday, July 05, 2005 12:28 PM
>To: Ian Jiang; openib-general at openib.org
>Subject: Re: [openib-general] [iser]about the target
>
>At 06:07 PM 7/4/2005, Ian Jiang wrote:
>>Hi!
>>I am new to the iSER.
>>On " https://openib.org/tiki/tiki-index.php?page=iSER", it is said that 
>>iSER currently contains initiator only (no target). Will the target come 
>>out later? How did they test the iSER initiator without a iSER target?
>>Could you give some explaination?
>
> From a practical perspective, there are very few iSCSI targets shipping 
> today.  Most people had envisioned iSER over IB to a gateway Ethernet 
> device since native IB storage is also quite rare in terms of real 
> product.  For many of us, our push for iSER over IB was to replace SRP 
> which has a deficient ecosystem thus not really used beyond some basic 
> Fibre Channel gateway cards.
>
>Mike
>
>>Thanks!
>>
>>
>>
>>Ian Jiang
>>ianjiang91 at hotmail.com
>>----
>>Computer Architecture Laboratory
>>Institute of Computing Technology
>>Chinese Academy of Sciences
>>Beijing,P.R.China
>>Zip code: 100080
>>Tel: +86-10-62564394(office)
>>
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