A bottleneck in gstripe?
kirk at strauser.com
Sat Feb 17 20:34:25 UTC 2007
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?
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
production system and I don't have the opportunity to play with it as much
as I'd like, so any pointers to experiments likely to make a difference
would be most welcome.
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