Date: Sun, 18 Feb 2007 00:38:14 +0100 From: Ivan Voras <ivoras@fer.hr> To: freebsd-questions@freebsd.org Subject: Re: A bottleneck in gstripe? Message-ID: <er83lg$9l2$1@sea.gmane.org> In-Reply-To: <200702171434.15077.kirk@strauser.com> References: <200702171434.15077.kirk@strauser.com>
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This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig0CF24AD5694077503853FBCA Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Kirk Strauser wrote: > I built a gstripe volume with 4 drives and a 128KB stripesize. When ru= nning=20 > one particular application, gstat reports that stripe/stripe1 is 99% bu= sy,=20 > although its four drives are running at less than 30% each. Am I=20 > misinterpreting the numbers - maybe the total is the sum of the drives?= -=20 > 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 ports/benchmarks/bonnie++ . > I've set kern.geom.stripe.fast=3D1, and kern.geom.stripe.fast_failed st= ays at=20 > 0. I don't have enough experience with geom_strip to even know where t= o go=20 > from here. Are stripe sizes likely to make much of a difference when t= he=20 > heaviest load is when PostgreSQL is receiving massive imports? This is= a=20 Not much, as the data is first written to WAL, which goes at full file system speed (no fsyncs). --------------enig0CF24AD5694077503853FBCA Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.4 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFF15HsldnAQVacBcgRAh8QAKCO+OqBwkNbx0kiv+tJTSpLGvUHLQCgucfe t7deG8OSzwxlkaw1vbtLpMw= =ZL1g -----END PGP SIGNATURE----- --------------enig0CF24AD5694077503853FBCA--
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