[san-tech][02725] Force10：新 ToR switch (S55 with ultra-deep packet) 発表

Date: Tue, 12 Oct 2010 18:37:18 +0900
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2011/06/10
[san-tech][02794] Re: Force10：新 ToR switch (S55 with ultra-deep packet) 発表
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先週 (10/6)、Force10から新しい ToR (top-of-rack) 1Uスイッチがアナウンス
されました：

"Force10 Introduces High Performance 1/10 Gigabit Ethernet Top-of-Rack Switch"
 October 6, 2010
  http://www.force10networks.com/news/pressreleases/2010/pr-2010-10-06.asp

  "The S55 complements Force10's other S-Series 1/10 GbE ToR products,
   including the recently announced S60 high performance access switch
   with ultra-deep packet buffering and the price/performance-optimized
   S50 and S25."



[san-tech][02356] Force10新製品：S60 (Ultra-deep packet buffering: 1.25 GB)
> "Force10 Sets Top-of-Rack Capstone with the Industry's First Switch
>  Purpose-built for Dynamic Virtualized Data Center Environments"
>  June 2, 2010
>   http://www.force10networks.com/news/pressreleases/2010/pr-2010-06-02.asp

S-Series S55 (High-Performance 1/10 GbE Top-of-Rack Switch)：今回
  http://www.force10networks.com/products/s55.asp
S-Series S60 (High-Performance GbE and 10 GbE Access Switch)
  http://www.force10networks.com/products/s60.asp

両者の主な違いは (S60: Ultra-deep packet buffering)
Performance: Switch fabric capacity: 136 Gbps  (同じ)
Forwarding capacity: S55は不明 (Forwarding capacity: 120 Mpps)
Switching latency: <5 μs for 64 byte frames (Switching latency: <9 μs for 64 byte frames)
Packet buffer memory: 4MB (Ultra-deep packet buffering: 1.25 GB)
CPU memory: 2GB (S60は不明)

実は H/W的には同じで、S60の Ultra-deep packet bufferingは CPU Memoryの
一部を割り当てていて、S55はそれを止めたモデル？
Packet Bufferへのアドレッシングがシンプルになった分、Latencyが小さく
なったってこと？

Force10のサイト等を捜しても、Ultra-deep packet bufferingの効果に
ついての解説等は見つかりません。そのうち Force10から比較レポートが
公開されないかなぁ・・・

"Force10 adds rack-topping Gigabit switch", 2nd June 2010
  http://www.theregister.co.uk/2010/06/02/force10_tor_gigabit_switch/

  "The S60 also has 1.25GB of deep packet buffering, which compared
   favorably to the 768MB in Arista Network's 7048 switch and the
   16MB in Cisco Systems' 4948-10GE switch. The Force10 Operating
   System (FTOS) inside the switch can partition up the packet buffers
   on the fly and allocate more or less buffer to specific ports as
   traffic conditions require."

やはりチューニングが難しいのでしょうか