From owner-freebsd-hackers Fri Jun 18 1:14:26 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from palrel3.hp.com (palrel3.hp.com [156.153.255.226]) by hub.freebsd.org (Postfix) with ESMTP id C78DF14CF5 for ; Fri, 18 Jun 1999 01:14:23 -0700 (PDT) (envelope-from darrylo@sr.hp.com) Received: from srmail.sr.hp.com (srmail.sr.hp.com [15.4.45.14]) by palrel3.hp.com (8.8.6 (PHNE_17135)/8.8.5tis) with ESMTP id BAA24842 for ; Fri, 18 Jun 1999 01:14:22 -0700 (PDT) Received: from mina.sr.hp.com by srmail.sr.hp.com with ESMTP (1.37.109.16/15.5+ECS 3.3) id AA086993661; Fri, 18 Jun 1999 01:14:21 -0700 Received: from localhost (darrylo@mina.sr.hp.com [15.4.42.247]) by mina.sr.hp.com with ESMTP (8.8.6 (PHNE_17135)/8.7.3 TIS 5.0) id BAA29087 for ; Fri, 18 Jun 1999 01:14:21 -0700 (PDT) Message-Id: <199906180814.BAA29087@mina.sr.hp.com> To: freebsd-hackers@freebsd.org Subject: Re: vinum performance Reply-To: Darryl Okahata In-Reply-To: Your message of "Thu, 17 Jun 1999 17:47:47 +0930." Mime-Version: 1.0 (generated by tm-edit 1.1.1.1) Content-Type: text/plain; charset=US-ASCII Date: Fri, 18 Jun 1999 01:14:20 -0700 From: Darryl Okahata Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Greg Lehey wrote: > On Thursday, 17 June 1999 at 3:43:10 -0400, David E. Cross wrote: > > I have a drive that is rated at ~16 Meg/second, and indeed it delivers on t > he > > order of 15+ Meg/second. If I use Vinum to create a concatinated device > > of 2 such units performance drops to 2.5 Meg/sec. This seems like a > > drastic drop in performance. > > Indeed, if you're comparing apples with apples. Possible marginally-related data point: with the 3.1-RELEASE vinum, and with striped drives (yes, I know the original user is using concatenated devices), I saw pretty bad write performance with the default filesystem frag size. Increasing the frag size (via newfs), increased performance substantially. -- Darryl Okahata darrylo@sr.hp.com DISCLAIMER: this message is the author's personal opinion and does not constitute the support, opinion, or policy of Hewlett-Packard, or of the little green men that have been following him all day. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message