On Tue, Oct 19, 2004 at 04:45:03PM -0300, Jo?o Carlos Mendes Lu?s wrote:
I'd say that you have to check which CCD chunk size is best for
your needs. The manual for vinum recommends avoiding chunk sized to a
power of two, which is probably the first big mistake of everybody.
I've tried a wide range of chunk sizes, from 128kB to 64MB.. also have
been avoiding powers of 2.
Try mounting with option noatime, if you haven't already. And use
the largest block size possible when formatting. Last time I read about
there was a limit of 16384, but I would expect better performance for
large file with 64k blocks (and 8k frags).
The largest block size is 64k, and I have done that as well.
If you don't have a need for safety on the files, you could try
mount async and measure if it suits better you need for performance than
softupdates. Sometimes softupdates is faster, and it is always safer.
Unfortunately, the files do need a bit of safety.I did think about
async, but I fear the worst to happen.