From owner-freebsd-fs@FreeBSD.ORG Mon Jul 5 08:39:31 2010 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 48D4C106566B for ; Mon, 5 Jul 2010 08:39:31 +0000 (UTC) (envelope-from marty.rosenberg@gmail.com) Received: from mail-vw0-f54.google.com (mail-vw0-f54.google.com [209.85.212.54]) by mx1.freebsd.org (Postfix) with ESMTP id EC7808FC1E for ; Mon, 5 Jul 2010 08:39:30 +0000 (UTC) Received: by vws6 with SMTP id 6so5818772vws.13 for ; Mon, 05 Jul 2010 01:39:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type; bh=+aMtG5xmIDiGgcm7j7bBqqkHVTQtNHken+dXFNBv40U=; b=nbtuMUiuMLmLDTXaH2hGASFpZGhgBPCiPJRD0sW1vrHx62nefyZrakVTOAiBJZJS7i Cc5ayC1dw9MVldWDXMcHW69tuWbEISa7QFD5VsnNaCXpniKC084PTFuovLnl09WYCfK7 cpBQCRc0JtIPe1K/cVurZgQ93cHzOf6ralY68= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=cRv4dKT41bs+vqQxCU6JLRks4YFrq+dM2HSKiHJVDsakORXAVSD08fdnvrghb9qT39 PDo5OSzCA+TQ7lEb8EHYrvQzNgJbTj2noJtWrFQYPnNoHywoma8tJxJd11BbbslheMn7 iyfEDrDUHHCVBF0XNwIsPHNf2fdvfbJlYXR5U= MIME-Version: 1.0 Received: by 10.220.75.148 with SMTP id y20mr1321045vcj.144.1278317748911; Mon, 05 Jul 2010 01:15:48 -0700 (PDT) Received: by 10.220.66.222 with HTTP; Mon, 5 Jul 2010 01:15:48 -0700 (PDT) In-Reply-To: <29067121.post@talk.nabble.com> References: <29065362.post@talk.nabble.com> <20100704005336.00003234@unknown> <29067121.post@talk.nabble.com> Date: Mon, 5 Jul 2010 01:15:48 -0700 Message-ID: From: Marty Rosenberg To: freebsd-fs@freebsd.org Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Subject: Re: zfs on 4k sector disks X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 05 Jul 2010 08:39:31 -0000 I've tried running zfs on a maximum of 22 disks in various configurations with raidz and raidz2, and 4-7 devices in each vdev. In general, the performance has been pretty abysmal. Using gnop to emulate a disk with 4k sectors, the performance usually starts out in a reasonable place (60-100MB/s, about the write speed of an individual disk), but after adding 30 or so gigabytes of data, the write speed drops dramatically. down to 1-3 MB/s in most instances. On Sat, Jul 3, 2010 at 7:44 PM, Bucarr wrote: > > > > On Sat, 3 Jul 2010 11:28:03 -0700 (PDT) > Bucarr wrote: > > > I was wondering that as well. So I set up a new FreeBSD8.0 box with > > a UFS2 disk as my boot disk and two WD 2TB EARS drives ("Advanced > > Format") for a zfs data array. I made no attempt to alter the WD > > drives in any way and ignored the 512b vs 4096b issues. 'zpool > > create tank raidz da0 da1' set up the array in a few seconds and I've > > copied to/from with no troubles and no apparent performance issues > > that I care about. If I had more of the WD drives lying around, I'd > > add those to the array and see what gives then. > > I suspect the performance may be acceptable, but probably not great. > I thought I didn't have any problems with RAIDZ's variable stripe size > on my EARS drives either until I found some writes would suddenly take > ages to finish, causing applications to hang. > > -- > Bruce Cran > > > I wonder if my 2 drive experiment in RAIDZ didn't simply mirror the drives > so that striping wasn't invoked at all? > -- > View this message in context: > http://old.nabble.com/zfs-on-4k-sector-disks-tp27664932p29067121.html > Sent from the freebsd-fs mailing list archive at Nabble.com. > > _______________________________________________ > freebsd-fs@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-fs > To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org" >