A bottleneck in gstripe?
ivoras at fer.hr
Sat Feb 17 23:38:45 UTC 2007
Kirk Strauser wrote:
> I built a gstripe volume with 4 drives and a 128KB stripesize. When running
> one particular application, gstat reports that stripe/stripe1 is 99% busy,
> although its four drives are running at less than 30% each. Am I
> misinterpreting the numbers - maybe the total is the sum of the drives? -
> or is there some giant overhead that I'm missing?
Nevermind the "% used" number, it's an approximation of an approximation
- how is your real world performance? For example, use
> I've set kern.geom.stripe.fast=1, and kern.geom.stripe.fast_failed stays at
> 0. I don't have enough experience with geom_strip to even know where to go
> from here. Are stripe sizes likely to make much of a difference when the
> heaviest load is when PostgreSQL is receiving massive imports? This is a
Not much, as the data is first written to WAL, which goes at full file
system speed (no fsyncs).
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