Re: Finder copy chunk size
Re: Finder copy chunk size
- Subject: Re: Finder copy chunk size
- From: Sam Vaughan <email@hidden>
- Date: Thu, 4 Dec 2003 18:46:56 +1100
Thanks for the great responses Brian and Quinn.
I returned 32MB in the f_iosize field of the statfs structure and saw
an immediate improvement. The Finder started using 512k chunks to copy
data between our volume and HFS, which improved the transfer speed
immensely.
I also tried setting the MNT_LOCAL flag in the f_flags field of the
statfs structure, but the chunk size didn't increase above 512k. I
doubt HFS imposes this limit, so I'm guessing the local file system
message isn't getting through.
Finally, I tried copying between two of our volumes. The 100MB QT
movie I copied transferred so fast that the progress window barely had
a chance to draw. My tracing showed that it used 32MB chunks - what an
improvement over 12k!
And to answer your question Brian, no, not XFS but CXFS, SGI's
clustered file system:
<
http://www.sgi.com/products/storage/tech/file_systems.html>
Soon Mac users everywhere will be able to enjoy the chewy goodness of
simultaneous direct fibre channel access to a central data store. :-)
Sam
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