[Wylug-help] ReiserFS slow copy

[Dan Walker]

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On Thursday 14 Aug 2003 12:33, Jim Jackson wrote:
> On Thu, 14 Aug 2003, Dan Walker wrote:
<snip>
> > I'm at a loss to explain it to the boss who now wants an NT server after
> > seeing this 10 hour copy operation. It was hitting 1 Gig a minute in
> > other areas of the drive.
>
> I can't imagine it's the reading of the small files of that's slowing it
> down, otherwise ReiserFS would have a bad reputation. So is it the
> writing, or something in cp's directory walking? Have you tried tar'ing up
> the osurce directyory and see it is quick? Then untar the tar ball? That
> would point to it being the read or the write thats slow. If both go fast
> then it's obvious a cp problem.
Well, I've had a few goes copying 120Mb of the same files using the same
command from one local drive to another and it took 13 seconds. Which is much
better ;-), although a single 51Meg file only takes just over 2secs.

Part of the problem may be that the original source drive was a Promise
Supertrak ATA-Raid card with three Raid 1 drives that were software RAID0ed
into a 180GB drive. We were trying to copy the whole drive to a single 180Gb
drive so we could subsequently Ghost it onto a rebuilt 540Gb RAID (We
couldn't ghost the three RAID 1s directly as we needed to resize them
afterwards).

The Supertrak has a very bad rep for throughput, although not, by any means,
that bad. I can only  assume that cp gets slower as time goes on, but that
seems farfetched.

Dan


- --
Daniel Walker
'Physics is like sex; sure, it may occasionally give some
practical results, but that's not why we do it"
- - Richard Feynman
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