Mailinglist Archive: opensuse (2831 mails)

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Re: [SLE] Home made NAS with SUSE - filesystem questions
  • From: Basil Chupin <blchupin@xxxxxxxxxx>
  • Date: Wed, 19 Jul 2006 17:38:38 +1000
  • Message-id: <44BDE17E.7090501@xxxxxxxxxx>
Jon Nelson wrote:
On Wed, 19 Jul 2006, Basil Chupin wrote:

Dave Howorth wrote:
HG wrote:
Hi!

I'm planning to build a home made NAS using old harware and SUSE. SUSE
might not be the best OS for this, but it's the only Linux I have
administered at least somewhat.

Ok, what I'm thinking is a old PC with lot's of old disks inside and a
gigabit ethernet (planning to do video editing over it also).
Even gigabit ethernet is WAY slower than local disks. You may find it a pain
for video editing. It might be OK to store video there, copy it to a local
disk while you edit it and then copy it back. But the bottom line is
experience - I suggest you set up the gigabit link and run some tests with
it first :)

Cheers, Dave
I haven't seen the original posting so this response is to HG.

Forget about using the gigabit ethernet way of transferring video files let
alone trying to do editing of video over such a link. Just transferring a
small ~4GB mpeg file will take about 45 minutes (from memory, so don't quote
me :-) ) and this using HDs with 16MB caches on both computers at the end of
the gigabit connection. After falling asleep while one such transfer was
taking place I gave the whole idea away and now only work on the one computer
:-) .

Let's see. 4GB. 4GB = 4096 MB. At 50MB/s that is 82 seconds. At 1/2 of gig-e's (more like 62.5% of to be conservative) speed. At (say) 75 MB/s a 4GB transfer would take under a minute. That's *way* faster than any local disk I've ever had.

I, too, did the sums and couldn't understand why it was taking so long to transfer the data.

Last night, it took 90 (+/- 0.6) seconds timed on a stopwatch to transfer 4,55,728,568 bytes from one HD to the other in Windows and it took, surprisingly, 118 seconds for SuSE 10.1 to do the same but, nevertheless, it certainly wasn't the ~45 minutes between the machines on the gigabit ethernet connection I mentioned.

If it is taking that long to transfer the data you have something wrong with your network or the disks are too slow. If the disks are too slow than complaining about the network doesn't help.

Certainly sounds like there is something not quite right with the setup but as I no longer bother to transfer data between the computers using this method I am not worried about it.

I mentioned my experience in response to the Q from HG to alert him to the potential problems of trying to do what he is trying to do over a gigabit connection. His mileage of course may vary so it is up to him to try it all out.

[rest pruned]

Cheers.



--
"It is well known that among the blind, the one-eyed man is king".

Desiderius Erasmus


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