Re: [Networker] e4500 Max I/O capacity issue as Legato Storage No de

I'm curious, how much data do you think will be directed toward this
storage node and how many different clients?

This is one hoss of a storage node!

Are the 9940Bs Fibre ready or is there a router in there? What type of
Fibre switch are you using?

-Bob

-----Original Message-----
From: Reed, Ted G II [CC] [mailto:ted.reed AT MAIL.SPRINT DOT COM]
Sent: Friday, April 04, 2003 2:43 PM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: [Networker] e4500 Max I/O capacity issue as Legato Storage Node


I am trying to determine the max I/O capacity of a Sun E4500 for usage as a
Legato storage node.  Here are the current stats and 'designed' I/O plans:

Sun E4500, 8x 400Mhz 4-8G Ram
        4 System Boards, 3 I/O boards
4x Gb Ethernet (Trunked as single IP)
3x 2Gb HBA fibre to Tape devices
6x STK 9940B in STK 9310 silo***

Since you lose ethernet bandwidth due to TCP/IP overhead, you can anticipate
~80MB/sec* per NIC (total ~320MB/sec).  The HBA fibre can handle
~250MB/sec** (total ~750MB/sec) and the 9940B drives running compressed at
60MB/sec*** per drive (total ~360MB/sec).  This should mean I will be
passing 320MB/sec over the e4500 I/O boards.  I am still determining if this
needs to be done GigE+HBA per I/O board or an all GigE board, all HBA board,
and a 'rollover' I/O board.
So I guess I am really wondering if anyone is pushing anything close to this
level of bulk data over a single storage node, regardless of the hardware
types being used.  Thank you all in advance for any information you may be
able to provide.
--Ted Reed, Engineering Storage Services


* 10BaseT ~0.8KB/sec, 100BaseT ~8MB/sec, 1000BaseT ~80MB/sec due to ~20-25%
TCP/IP overhead
** Little to no overhead on fibre for protocols.  1Gb=125MB, 2Gb=250MB
*** 30MB/sec native, 60MB/sec compressed, 90MB/sec burst.  200G native
capacity, 300-600G compressed

--
Note: To sign off this list, send a "signoff networker" command via email
to listserv AT listmail.temple DOT edu or visit the list's Web site at
http://listmail.temple.edu/archives/networker.html where you can
also view and post messages to the list.
=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=

--
Note: To sign off this list, send a "signoff networker" command via email
to listserv AT listmail.temple DOT edu or visit the list's Web site at
http://listmail.temple.edu/archives/networker.html where you can
also view and post messages to the list.
=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=