From owner-freebsd-scsi@FreeBSD.ORG Mon May 25 15:33:35 2009 Return-Path: Delivered-To: freebsd-scsi@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id B69B0106564A for ; Mon, 25 May 2009 15:33:35 +0000 (UTC) (envelope-from francisco.cabrita@gmail.com) Received: from fg-out-1718.google.com (fg-out-1718.google.com [72.14.220.157]) by mx1.freebsd.org (Postfix) with ESMTP id 2B13A8FC08 for ; Mon, 25 May 2009 15:33:34 +0000 (UTC) (envelope-from francisco.cabrita@gmail.com) Received: by fg-out-1718.google.com with SMTP id e12so565021fga.12 for ; Mon, 25 May 2009 08:33:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=8+OQSn1svAg9GJdF3wgWMtOHEYs4ZeTf/JlxkY4QguM=; b=xsTuoqdlMKhcKIYn1s5xi5cS34Hv3XM9Xu9Jw8/FVYIykymADTMftmbrxSPhqhm51a ZciVAqCuwzSW9UtLhV0ZnWOt9eK757wUrZI9mLBFWRZ0oXNVPvSVVFuxT5WNIAGIj1/Z PjBfgnTXAkmvXDj2NqlEGcp+Xl8NN9dp4U0O8= 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 :cc:content-type; b=O+VuDIRLkaGKzdZWOoerRrk8jNaegkKXq0xaBc7Ll4IP7Cf2lpax6oFvBcM5VZHxyx D7UsYr4qL1E/Xq+bEbFQ7RSfNGCG2JnH1w2kNdRQ/0VeNEi6XtQTt1nbdzRA9N17hqFJ +r1gW02xpitR7pIyCdc2sS3pAwUMfsYRE5lnk= MIME-Version: 1.0 Received: by 10.239.164.9 with SMTP id r9mr514250hbd.38.1243265613981; Mon, 25 May 2009 08:33:33 -0700 (PDT) In-Reply-To: <200905251056.09987.lists@jnielsen.net> References: <200905251056.09987.lists@jnielsen.net> Date: Mon, 25 May 2009 16:33:33 +0100 Message-ID: From: Francisco Cabrita To: John Nielsen Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: freebsd-scsi@freebsd.org Subject: Re: Question about iSCSI X-BeenThere: freebsd-scsi@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: SCSI subsystem List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 25 May 2009 15:33:36 -0000 Hi John, I first want to say many thanks for your reply. On Mon, May 25, 2009 at 3:56 PM, John Nielsen wrote: > On Monday 25 May 2009 09:30:40 am Francisco Cabrita wrote: > > info: > > I have built a NAS server under FreeBSD. Geom RAID5 over 3 hard disks > > and iSCSI target0 created. > > It is up and running without problems "exporting" a SCSI driver to a Ms > > Windows 2000 Server with Microsoft iSCSI Inititator driver. > > The volume is NTFS. > > > > doubt: > > I have read multiple "old" posts around the web that I can't connect > > multiple initiators (w2k clients) to the same target. Is this true > > nowadays? > > You do not want two machines to have write access to the same SCSI device > at the same time unless you use a filesystem designed for such access. > NTFS is not such a filesystem. Just hooking two win2k boxes to the same > iSCSI target to do NTFS will cause problems. yep I had such problems. > > > Alternatives: > Microsoft clustering (two or more nodes coordinate to provide certain > services, the disk volume is only active on one of them at any given > time) I need to seek a Windows expert down here :) > > Some real clustered filesystem designed for shared access. I don't know of > any for Windows off the top of my head but I haven't ever looked in to > it. > Use the setup you have already with one w2k client, then use Windows > filesharing to export the volume to other clients. > Avoid the middleman, drop iSCSI and just use Samba on the NAS box. (Or NFS > if you want to dabble in Microsoft's Services for Unix... (cue scary > music)) In another company I have another FreeBSD NAS exporting a NFS volume to another FreeBSD Samba server, on wich I share some directories to Ms XP clients. I have no iSCSI on it and it's just fine. Almost 3 years up and running. Avoiding iSCSI it's a nice possibility but, on this new scenario the volumes are exported to both w2k PDC and w2k BDC. My client relies upon a very granular permission scheme. I don't know if I can handle this without a NTFS volume. (If I'm not wrong, we can't format a NTFS partition under FreeBSD) > > > > Facts: > > I really need at least two w2k clients to the same "storage NAS". Any > > tip about how to solve this? > > Maybe some kind of failover technique between both w2k servers? > > This is similar to the MS clustering option, there may be more manual ways > to achieve the same effect. I prefer not to use manual tasks. > > > I really appreciate your help. Thanks in advance > > PS: I am thinking about sending this email to FreeBSD Cluster ML too. > > Note that if you want to stick with iSCSI on the FreeBSD side then your > questions are really Microsoft-centered, so non-FreeBSD resources may be > more appropriate. Questions about configuring your FreeBSD storage box to > allow concurrent access by multiple clients that happen to be running > Windows would be appropriate on the FreeBSD-questions mailing list. Yes you are totally right. I just want to say I am truly grateful about your reply because my primary doubt was about the possibility or not to "map" multiple initiators to one target. And, where is the best place to ask a thing and get a really valid answer? yep FreeBSD ML :) I will try to explore your tips about MS Clustering. Once again Thanks Francisco Cabrita > > > JN > -- blog: http://sufixo.com/raw http://www.linkedin.com/in/franciscocabrita