Slow disk write speeds over network
Eric Anderson
anderson at centtech.com
Mon Jun 9 15:16:39 PDT 2003
Chuck Swiger wrote:
> Eric Anderson wrote:
>
>> Ok, I have a file server (NFS) running FreeBSD 4.8-RC1, which is
>> having incredibly slow disk write speeds. Locally, doing something like:
>> dd if=/dev/zero of=/partition/testfile
>> Shows 14MB/s - which is what I expect..
>>
>> However, ftping a file or cp'ing over NFS shows speeds less than 1MB/s
>> - which is not what I would expect - it's got gigabit ethernet, and
>> has very fast read times (via ftp or nfs) over the network.
>
>
> If the slowdown was only with regard to NFS, I'd ask you about what your
> NFS clients looked like. However, if you're seeing a slowdown for FTP
> and other network protocols, it's more likely to be a physical problem
> with cabling, a NIC getting flaky, or something along those lines.
I see it in both NFS and ftp transfers, but like I said in one of my
other notes, I have 4 network cards in this machine, all act the same way.
> Do you have this connected to a managed switch so that you can take a
> look at the interface statistics for problems? Maybe try cranking the
> NIC down from gigabit to 100Mbs ethernet speed and see whether that
> makes a difference?
Yes - and I just tried that suggestion - same thing. No help.
Interfaces look ok.
Eric
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Eric Anderson Systems Administrator Centaur Technology
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