From owner-freebsd-xen@FreeBSD.ORG Tue Oct 21 07:24:01 2014 Return-Path: Delivered-To: freebsd-xen@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 66207E37; Tue, 21 Oct 2014 07:24:01 +0000 (UTC) Received: from cu01176b.smtpx.saremail.com (cu01176b.smtpx.saremail.com [195.16.151.151]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id F26F8E46; Tue, 21 Oct 2014 07:24:00 +0000 (UTC) Received: from [172.16.2.46] (izaro.sarenet.es [192.148.167.11]) by proxypop04.sare.net (Postfix) with ESMTPSA id 0D4299DE39C; Tue, 21 Oct 2014 09:23:51 +0200 (CEST) Mime-Version: 1.0 (Mac OS X Mail 8.0 \(1990.1\)) Subject: Re: disk loss From: Egoitz Aurrekoetxea In-Reply-To: <1413808457.2828604.181041145.4121AB54@webmail.messagingengine.com> Date: Tue, 21 Oct 2014 09:23:49 +0200 Message-Id: <0084B089-9F31-43F0-8ED4-77CB45AE424D@sarenet.es> References: <000001cfe3ca$8d242950$a76c7bf0$@ezwind.net> <5436CF13.4080509@citrix.com> <000101cfe3f1$91407da0$b3c178e0$@ezwind.net> <65CC3330-E22F-4253-918E-72CA9B004A81@sarenet.es> <1413808457.2828604.181041145.4121AB54@webmail.messagingengine.com> To: Mark Felder X-Mailer: Apple Mail (2.1990.1) Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.18-1 Cc: freebsd-xen@freebsd.org X-BeenThere: freebsd-xen@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Discussion of the freebsd port to xen - implementation and usage List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 21 Oct 2014 07:24:01 -0000 Egoitz Aurrekoetxea Departamento de sistemas 944 209 470 Parque Tecnol=C3=B3gico. Edificio 103 48170 Zamudio (Bizkaia) egoitz@sarenet.es www.sarenet.es Antes de imprimir este correo electr=C3=B3nico piense si es necesario = hacerlo. > El 20/10/2014, a las 14:34, Mark Felder escribi=C3=B3= : >=20 >=20 >=20 > On Mon, Oct 20, 2014, at 02:09, Egoitz Aurrekoetxea wrote: >> Good morning, >>=20 >> I would recommend you using NFS instead of iSCSI. It=E2=80=99s far = more better to >> handle the connection to disk arrays (the FreeNAS in this situation) >> through a mature and stable protocol like NFS >> and not something manipulating blocks directly. I would advise you to >> rely the responsibility of serving the SR to NFS.=20 >>=20 >=20 > You can't have redundant paths with NFS (in FreeBSD), though. I'm not = so > sure everyone would agree that NFS is mature and stable, either :-) Sure you can have redundant paths with a proper configuration with = Spanning tree=E2=80=A6 and everything not touching directly blocks is IMHO always safer=E2=80=A6 because the part you rely the disks = integrity is all in the same place=E2=80=A6 and takes care of committing = changes properly having less probabilities to leave the vdi corrupt=E2=80=A6. Faster??=E2=80=A6 how have you written to disk?? the file system you = have used to which NFS was doing I/O how did it manage the write = commits?. Did=20 you use Jumbo frames?=E2=80=A6 there is pretty relative all that you = have said=E2=80=A6 And IMHO yes, NFS is tested and tried (mainly in some = versions and configs)=20 very extensively and with very high loads=E2=80=A6 apart nowadays 10gbps = switches exist... >=20 > My personal experience with building a Xen+FreeBSD cluster concluded > that NFS was far too slow and unreliable, and a properly configured > iSCSI with multiple paths and proper alignment was extremely fast. > _______________________________________________ > freebsd-xen@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-xen > To unsubscribe, send any mail to "freebsd-xen-unsubscribe@freebsd.org"