Re: tuning for large files in xfs

From: Avi Kivity
Date: Mon May 22 2006 - 15:35:39 EST

fitzboy wrote:
That makes sense, but how come the numbers for the large file (2TB)
doesn't seem to match with the Avg. Seek Time that 15k drives have? Avg
Seek Time for those drives are in the 5ms range, and I assume they
aren't just seeking in the first couple tracks when they come up with
that number (and Bonnie++ confirms this too). Any thoughts on why it is
double for me when I use the drives?

What's your testing methodology?

You can try to measure the amount of seeks going to the disk by using iostat, and see if that matches your test program.

Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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