From owner-freebsd-questions@FreeBSD.ORG Sat Feb 17 23:38:45 2007 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 6ABE716A400 for ; Sat, 17 Feb 2007 23:38:45 +0000 (UTC) (envelope-from freebsd-questions@m.gmane.org) Received: from ciao.gmane.org (main.gmane.org [80.91.229.2]) by mx1.freebsd.org (Postfix) with ESMTP id EFDB113C467 for ; Sat, 17 Feb 2007 23:38:44 +0000 (UTC) (envelope-from freebsd-questions@m.gmane.org) Received: from list by ciao.gmane.org with local (Exim 4.43) id 1HIZ8X-0008TV-85 for freebsd-questions@freebsd.org; Sun, 18 Feb 2007 00:38:37 +0100 Received: from 89-172-50-63.adsl.net.t-com.hr ([89.172.50.63]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sun, 18 Feb 2007 00:38:37 +0100 Received: from ivoras by 89-172-50-63.adsl.net.t-com.hr with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sun, 18 Feb 2007 00:38:37 +0100 X-Injected-Via-Gmane: http://gmane.org/ To: freebsd-questions@freebsd.org From: Ivan Voras Date: Sun, 18 Feb 2007 00:38:14 +0100 Lines: 48 Message-ID: References: <200702171434.15077.kirk@strauser.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig0CF24AD5694077503853FBCA" X-Complaints-To: usenet@sea.gmane.org X-Gmane-NNTP-Posting-Host: 89-172-50-63.adsl.net.t-com.hr User-Agent: Thunderbird 1.5.0.9 (Windows/20061207) In-Reply-To: <200702171434.15077.kirk@strauser.com> X-Enigmail-Version: 0.94.1.2 Sender: news Subject: Re: A bottleneck in gstripe? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Feb 2007 23:38:45 -0000 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--