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- From: ntaib@silver.ucs.indiana.edu (Iskandar Taib)
- Subject: Re: local bus hard disk
- Message-ID: <C1FG6M.5xx@usenet.ucs.indiana.edu>
- Sender: news@usenet.ucs.indiana.edu (USENET News System)
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- Organization: Indiana University
- References: <1993Jan23.231824.24755@rose.com> <1993Jan24.014406.27423@mlb.semi.harris.com>
- Date: Mon, 25 Jan 1993 20:42:21 GMT
- Lines: 36
-
- In article <1993Jan24.014406.27423@mlb.semi.harris.com> sonny@trantor.harris-atd.com (Bob Davis) writes:
- >In article <1993Jan23.231824.24755@rose.com> gyl.midroni@rose.com (gyl midroni) writes:
- > [DELETIONS]
- >> It seems to me that local bus disk access will be a speed booster
- >>for the reason of faster data communicatio with the CPU / memory. It
- >>is four times faster to get data off the disk at 33 MHz off the local
- >>bus connection to the CPU and memory than at 8 MHz via the ISA bus.
- >>As simple as that... no? Why would this impact system performance
- >
- > And isn't it expensive overkill to provide a 132 million bytes/sec
- >truck (local bus) to haul 3 million bytes/sec freight ( a fast hard drive's
- >maximum, spin-limited data transfer rate)? Seems like that expensive local
- >bus truck will be sitting idle almost 98% of the time. Even the cheaper
- >ISA bus truck will be idle almost 44% of the time. This assumes that
- >DMA transfers from disk to memory can burst the data at the bus rate and then
- >free up the memory address bus until the next truckload of bytes can be spun
- >up off the disk. (Can a local bus card use DMA, as I am assuming?)
- >
-
- Hmmmm
-
- What is "big bucks" here? How much more will a local bus IDE
- paddle card cost compared to an ISA one? I thought one endearing
- feature of local bus is supposed to be that it is cheap.
-
- My guess is that if you want a small Novell server you'll see the
- benefits of local bus IDE, otherwise you'll only notice it at some
- times (eg when loading apps).
-
-
-
- --
- -------------------------------------------------------------------------------
- Iskandar Taib | The only thing worse than Peach ala
- Internet: NTAIB@SILVER.UCS.INDIANA.EDU | Frog is Frog ala Peach
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