Date: Sat, 18 Jan 2003 10:12:13 -0800 From: Lars Eggert <larse@ISI.EDU> To: Scott Mitchell <scott.mitchell@mail.com> Cc: Jay Sern Liew <jay@americanhorizonsbank.com>, freebsd-hackers@FreeBSD.ORG Subject: Re: 5400RPM|7200RPM Cable bottleneck? Message-ID: <3E2998FD.1010904@isi.edu> In-Reply-To: <20030118105015.GB783@fishballoon.dyndns.org> References: <1042849118.3e289d5ee4458@webmail.americanhorizonsbank.com> <20030118105015.GB783@fishballoon.dyndns.org>
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[-- Attachment #1 --]
On 1/18/2003 2:50 AM, Scott Mitchell wrote:
> On Fri, Jan 17, 2003 at 06:18:38PM -0600, Jay Sern Liew wrote:
>>
>> Does anyone know if a NFS server with a 7200RPM IDE HD will perform
>>significantly better than a 5400RPM IDE HD over a cable connection? I'm
>>assuming that the performance will only be noticable iff the NFS client is
>>close(geographically) to the NFS server, i.e. same LAN since the bottleneck
>>would be at the network level.
>
> If by 'cable' you mean a cable modem providing at best a few Mb/s
> bandwidth, then I doubt the speed of your disk will have any impact
> whatsoever. Even the crappiest ATA disk will be able to deliver a few
> MB/s -- in the worst case that's still an order of magnitude more than you
> can stuff down your cable modem.
I've tried NFS mounting ISI servers at home over PPTP over a cable modem
connection, and it's painfully slow - much slower than the bandwidth of
the cable pipe. NFS isn't well tuned for high-RTT environments (in my
case, 20ms).
If you get anything reasonable working, I'd be very interested in seeing
your NFS parameters. Or, if you settle on anything else (AFS, etc.), I'd
be interested to hear how that compares.
Lars
--
Lars Eggert <larse@isi.edu> USC Information Sciences Institute
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