From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jose Nuno Neto Subject: Re: Too many paths from multipath? Date: Wed, 02 Dec 2009 18:57:08 +0100 Message-ID: <4B16AA74.7050307@eib.org> References: <4B168B7F.6060307@eib.org> <1259774764.2177.9.camel@localhost> Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1"; format="flowed" Content-Transfer-Encoding: quoted-printable Return-path: In-reply-to: <1259774764.2177.9.camel@localhost> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: jsosic@srce.hr, device-mapper development List-Id: dm-devel.ids Ok that seems right, but on my case I have 4connections per HBA total of=20 8per Lun The info I got regarding zoning is that each HBA is connected/zoned to=20 only one Storage controller So that would make 2connections per Lun What I suspect is that the Fabric here is made of 4switchs and that=20 makes 4x plus. The SAN people just configured it with a generic "big"=20 fabric zoning just one connection. but Linux shoes 4. could this be the=20 reason? Jakov Sosic wrote: > On Wed, 2009-12-02 at 16:45 +0100, Jose Nuno Neto wrote: > > =20 >> I have 2 HBAs connected to one LUN on a Hitachi Storage. Only two=20 >> connections have been zoned >> =20 > > If one connection goes to one switch, and that switch is connected to > two controllers on the storage, then you'll see two paths on that HBA i= n > your host. If you have two HBA's and second is connected to second > switch, which is also connected to two controllers of the stroage, then > you'll see 4 of them. > > That is the situation in my company. It goes like this: > > > ________Hitachi controller0 > / > HOST----switch0 > \ > \_______Hitachi controller1 > > > > > > =20 -------------------------------------------------------------------- Les informations contenues dans ce message et/ou ses annexes sont=20 reservees a l'attention et a l'utilisation de leur destinataire et peuven= t etre=20 confidentielles. Si vous n'etes pas destinataire de ce message, vous etes= =20 informes que vous l'avez recu par erreur et que toute utilisation en est=20 interdite. Dans ce cas, vous etes pries de le detruire et d'en informer l= a=20 Banque Europeenne d'Investissement. The information in this message and/or attachments is intended solely for= =20 the attention and use of the named addressee and may be confidential. If=20 you are not the intended recipient, you are hereby notified that you have= =20 received this transmittal in error and that any use of it is prohibited. = In=20 such a case please delete this message and kindly notify the European=20 Investment Bank accordingly. -------------------------------------------------------------------- =20