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- Comments: Gated by NETNEWS@AUVM.AMERICAN.EDU
- Path: sparky!uunet!paladin.american.edu!auvm!BOKONON.UUCP!STEPHEN
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- Message-ID: <19921224.023123.2916@bokonon.UUCP>
- Newsgroups: bit.listserv.novell
- Date: Wed, 23 Dec 1992 16:31:23 -0500
- Reply-To: stephen@bokonon.uucp
- Sender: NOVELERR@SUVM.SYR.EDU
- From: stephen@BOKONON.UUCP
- Subject: Re: how many ethernet cards can I put in a server?
- Lines: 31
-
- $>Is there any limit to the number of ethernet cards a 3.11 server can handle?
- $>The machine has an ISA bus with twelve slots, and IRQ 2, 3, 4, 5, 7, 10 and 11
- $>are free. There is free memory from D0000-EFFFF.
-
- $Don't know about ISA but I have two microchannel servers each with 4
- $ethernet cards (mostly SMC).
-
- MCA and EISA machines can share interrupts between cards; ISA
- machines cannot. Generally, network cards will require an interrupt,
- so you will be limited to seven such cards (and, of course, if you
- wish to use serial or parallel ports, you will find yourself with
- less and less interrupts available).
-
- What's the theoretical limit? I'm not sure if it's 8, 16, infinite,
- or something else. In any case, it's probably higher than the number
- of cards that you can get to coexist in almost any machine. Keep
- in mind that the aggregate I/O throughput on an ISA bus is rather
- limited, and the more networks and host adapters and tape drives and
- other devices you put in, the more clogged your ISA bus will become.
- Theoretically, seven ethernet cards all running full tilt will just
- about eat up the available bandwidth on an ISA bus, leaving next to
- nothing left over for your disk drives. Practically, seven ethernet
- cards will not all be running full tilt, but it's something to
- keep in mind.
-
- -Steve
- --
- stephen@bokonon.UUCP ...!{xrtll,becker.gts.org}!bokonon!stephen
- ----------------------------------------------------------------------------
- Stephen M. Dunn, CNE, ACE, Sr. Systems Analyst, United System Solutions Inc.
- 104 Carnforth Road, Toronto, ON, Canada M4A 2K7 (416) 750-7946
-